FINAL REPORT (ISSUE 07A) Supporting electricity sector reform in Libya TASK C: Institutional Development and Performance Improvement of GECOL Report 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 14/12/2017 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Contents 1 Executive Summary ................................................................................................... 5 1.1 Generation .................................................................................................................. 7 1.2 Transmission.............................................................................................................. 12 1.3 Control ....................................................................................................................... 14 1.4 Medium Voltage ........................................................................................................ 16 1.5 Distribution................................................................................................................ 17 2 Introduction ............................................................................................................ 19 3 Generation .............................................................................................................. 24 3.1 Current status............................................................................................................ 24 3.1.1 Overview ............................................................................................................ 24 3.1.2 Overdue maintenance ....................................................................................... 33 3.1.3 Fuel supply ......................................................................................................... 39 3.1.4 Third party power stations ................................................................................ 40 3.1.5 Generation expansion ........................................................................................ 41 3.2 Energy balance .......................................................................................................... 47 3.3 Points of concern....................................................................................................... 50 3.3.1 Immediate concerns .......................................................................................... 50 3.3.2 Longer term concerns ........................................................................................ 51 3.4 Generation action plan.............................................................................................. 52 4 Transmission ........................................................................................................... 56 4.1 Current status............................................................................................................ 56 4.2 Transmission substations .......................................................................................... 57 4.3 Overhead transmission lines ..................................................................................... 63 4.4 Underground transmission cables ............................................................................ 66 4.5 Points of concern....................................................................................................... 67 4.5.1 Immediate concerns .......................................................................................... 67 4.5.2 Longer term concerns ........................................................................................ 67 4.6 Transmission action plan........................................................................................... 69 5 Control .................................................................................................................... 74 5.1 Current status............................................................................................................ 74 5.1.1 Overview ............................................................................................................ 74 2 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5.1.2 National Control Center (NCC) ........................................................................... 75 5.1.3 Tripoli Regional Control Center (TRCC) .............................................................. 78 5.1.4 Benghazi Regional Control Center (BRCC) ......................................................... 79 5.1.5 Distribution Control Centers (DCC) .................................................................... 80 5.1.6 Generation Dispatch and Transmission Network Control ................................. 82 5.1.7 Telecommunications .......................................................................................... 89 5.1.8 Demand side management (DSM) ..................................................................... 90 5.2 Points of concerns ..................................................................................................... 93 5.2.1 Immediate concerns .......................................................................................... 93 5.2.2 Longer term concerns ........................................................................................ 94 5.3 Control action plan .................................................................................................... 95 6 Medium Voltage (Subtransmission) ......................................................................... 99 6.1 Medium Voltage cables and overhead lines ............................................................. 99 6.1.1 Investment Strategy ........................................................................................... 99 6.1.2 Description of 66kV & 30kV lines (cables and overhead lines) population ..... 101 6.1.3 Condition of GECOL's MV lines, faults and outages ........................................ 102 6.2 Medium Voltage switchgear ................................................................................... 105 6.2.1 Analysis of MV switchgear failures .................................................................. 106 6.3 Medium Voltage power transformers .................................................................... 107 6.3.1 MV transformers investment strategy ............................................................ 108 6.3.2 Description of MV transformers population ................................................... 109 6.3.3 Condition of GECOL MV power transformers and their defects ..................... 109 6.4 Points of concern..................................................................................................... 115 6.4.1 Immediate concerns ........................................................................................ 115 6.4.2 Longer term concerns ...................................................................................... 115 7 Distribution ........................................................................................................... 117 7.1 Introduction............................................................................................................. 117 7.2 Distribution asset statistics ..................................................................................... 117 7.3 Investment strategy ................................................................................................ 117 7.3.1 Distribution transformers ................................................................................ 118 7.3.2 Distribution cables ........................................................................................... 118 3 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 7.3.3 Distribution substations ................................................................................... 119 7.4 Description of assets population............................................................................. 120 7.4.1 Ground mounted transformers ....................................................................... 120 7.4.2 Distribution substations ................................................................................... 122 7.4.3 Distribution lines .............................................................................................. 123 7.5 Condition of Distribution assets and their defects ................................................. 124 7.5.1 Condition of ground mounted distribution transformers – defects and failures 124 7.5.2 Condition of pole mounted distribution transformers – defects and failures 130 7.5.3 Condition of GECOL distribution substations and their defects ...................... 134 7.5.4 Condition of distribution lines and their defects ............................................. 139 7.6 Points of concern..................................................................................................... 143 7.6.1 Immediate concerns ........................................................................................ 143 7.6.2 Longer term concerns ...................................................................................... 144 8 MV and Distribution action plan ............................................................................ 145 9 Key Performance Indicators ................................................................................... 153 9.1 Generation KPIs ....................................................................................................... 154 9.1.1 Recommendations ........................................................................................... 156 9.2 Transmission KPIs .................................................................................................... 158 9.2.1 Recommendations ........................................................................................... 161 9.3 Control KPIs ............................................................................................................. 162 9.3.1 Recommendations ........................................................................................... 165 9.4 Medium Voltage KPIs .............................................................................................. 167 9.4.1 Recommendations ........................................................................................... 168 9.5 Distribution KPIs ...................................................................................................... 169 9.5.1 Recommendations ........................................................................................... 171 4 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1 Executive Summary Libya has invested heavily in its electricity infrastructure over the past decades. Although these investments have been directly funded by the Libyan government through its development budget, GECOL, the General Electricity Company of Libya and its sole national power utility, has been the key player planning and orchestrating these investments. The combination of an oil rich nation with a policy of universal electrification and a power utility with stringent criteria on the expansion planning of its system, the result has been a robust power transmission network and ambitious undertaking of generation plant construction projects. Since the events of February 17, 2011, GECOL’s fortunes have taken a turn for the worse, and this is reflected in the operation of its core business units and of the Libyan electricity infrastructure. Insecurity and political instability have led to a halt in most projects, successive assaults on GECOL assets and staff, a large increase in thefts, especially of conductors and electrical apparatus, and a significant decline in GECOL’s ability to carry out maintenance activities. The result has been loss of some infrastructure assets, a fall in the performance of the power network, and a severe shortage in power generation capacity causing long power cuts in many parts of the country, especially during the summer and winter peak load periods. In fact, it is not an exaggeration to say that only the redundancies built into the Libyan power network and the resilient specifications and design of its systems and components, coupled with what can only be described as heroic efforts by many of GECOL’s workforce, has prevented the collapse of the power network and ensured continued supply of power to the majority of the population the majority of the time. This report aims to assess GECOL power system assets, to determine their current capabilities and requirements, and to propose an action plan to GECOL on how to recover and improve its technical activities and services. This will be done with a focus on each of GECOL’s technical business units. Regardless of what is presented in this report, we should point out that GECOL is not standing still. GECOL is itself making great efforts to resolve its many problems and to deal with the obstacles and difficulties the current Libyan political and security situation has created. GECOL has also continued to expand and grow its power network despite the cessation of most other project activities in Libya and general financing difficulties. This report does not purport to be an exhaustive analysis of every aspect of GECOL’s technical activities, nor is it re-inventing the wheel. It has only been possible to collect the data and information in this report through the strong and total support and assistance of 5 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE GECOL’s management and staff, whom we thank profusely. Thus, the details and results of the study are not new material and are already well known to GECOL and its management, who are working hard at resolving the issues discussed. This report attempts to present new perspectives on these issues, to highlight priorities and some of the urgent actions needed, and to help GECOL in the decision-making process. 6 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1.1 Generation GECOL has some 26 power stations containing 85 generating units of various sizes, technologies and ages distributed around Libya, with the majority along Libya’s Mediterranean coastline. GECOL’s official installed capacity as of 2017 is 10.238GW. While the power available to supply the power network varies continuously in line with external and internal constraints and maintenance and other works, at the time of this study up to 5.35GW was GECOL’s available power, representing 52% of installed capacity. In this report we consider at least 19 units of GECOL’s 85 have reached retirement age and should be decommissioned. Excluding these units, with an installed capacity of 483MW and which have generally contributed no power to the Libyan system over the past years, would leave GECOL with an installed capacity of 9.755GW and the realistic available capacity would become 54.8% of the installed. From an initial overview of GECOL’s power generation, we find:  The generation capacity is heavily tilted towards simple cycle and combined cycle gas turbine units, representing 86% of the installed capacity and 94% of the available capacity. In fact, until the new Gulf power station’s first unit came online in 2014, GECOL had not constructed a new steam power station since 1985.  There is no power generation in the Southern region, causing voltage instabilities and prolonged power outages compared with other parts of Libya. The new Ubari power plant will be an important first step in resolving these problems.  Generation in the eastern region is limited to two aging steam power plants, while the Benghazi Region has one large power generating complex at Benghazi North. Between 2015 and 2016, during which the Eastern and Western power networks were separated due to damage to overhead lines, the Eastern power network suffered from successive blackouts because of its dependence on Benghazi North as the single main source of electricity supply. Recently a contract was signed for four new gas turbine units in Tobruk, and that will help to alleviate this dependence.  Between 2010 and 2016, weighted average generating unit availability has fallen from 78.3% to 66.0%, and the available capacity has fallen from 64.6% to 53.7% of installed capacity, while demand has continued to grow at around 4% per year.  Between 2010 and 2016 the thermal efficiency of GECOL’s power generation has increased by 7.3%, mainly due to the introduction of steam units associated with the combined cycle gas turbine units at Benghazi North and Misurata, and increase operation of generation on natural gas instead of liquid fuel. The latter grew from 41% of energy produced coming from gas in 2010 to 80% in 2016.  Despite all the difficulties of Libya’s project environment since 2011, GECOL has commissioned 14 new generating units between 2012 and August 2017, total an addition of 2.295GW to the installed capacity. 7 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE The main concerns we have identified constraining optimal operation of GECOL’s generation assets and causing the current power shortages in the Libyan power network include: 1. Overdue maintenance: Due to limitations on GECOL’s ability to carry out major maintenance works and overhauls of the power generating units, the power out puts of many units has been reduced to well below nameplate capacity. We estimate that carrying out these major maintenance works could add 2GW or more to GECOL’s available capacity. Factors that have contributed to the growing backlog of overdue maintenance works include:  Overhauls of power generating units are considered a capital investment, and are therefore funded by the Libyan Development Budget, funded by the State. GECOL therefore does not have control of the supply of funds.  Most of GECOL’s generating units are gas turbines, which have a much higher maintenance requirement than steam turbines, with periodic inspections and major overhauls according the number of operating hours and operating conditions. These units could require a major overhaul as often as once every three to four years. With 50 gas turbines in service, GECOL may have to carry out as many as 10 to 15 major overhauls every year to maintain the condition of its units. This would require the government to budget more than 250 USD million every year just for overhauls.  GECOL has built up over the years a technical capacity to carry out much of the work in major overhauls. However, the specialized nature of major overhauls usually means that supervision by the generating units’ suppliers is also required to carry out the overhauls and to carry out some specialized works. Libya’s security and stability situation and the advice of foreign governments have meant that many suppliers do not permit their personnel to travel to Libya, impacting GECOL’s ability to carry out overhauls. Figure (1-1) shows the growing backlog in major overhauls GECOL is facing. Figure (1-1): Generating unit overhauls analysis 2010-2017 8 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2. Fuel supply: Almost all GECOL’s power stations have been adversely affected by the supply of fuel in one way or another. Fuel affects power production by several means. Most critical is the very availability of fuel. Insecurity and instability in Libya have led to fuel sources supplying power plants being repeatedly cut off. However, this is only one aspect of the supply of fuel. Another is the growing dependence of power plants on gas as the primary operating fuel. Both the gas pipeline infrastructure and the production of natural gas are unable to keep up with demands. In several cases smaller or less important power generating units are being taken off line to ensure there is sufficient natural gas or sufficient pressure to keep the larger and more important units in operation. Similarly, less critical or less sensitive units are being switched to LFO operation so the more critical or sensitive units can operate on gas. This is despite the higher direct and indirect costs of using LFO. Several of the plants forced to operate on LFO do not have pipelines for the liquid fuel and have to be supplied by trucks, which is a logistical difficulty in itself. We estimate that GECOL regularly loses at least 600MW of its installed capacity because of constraints imposed by the supply of fuel. If GECOL did recover all capacity derated or put out of service because of maintenance problems, it is questionable if sufficient supplies of fuel could be secured to operate them all at full rating. 3. Third party power plants: There are two power stations owned by third parties that are connected to GECOL’s power grid. One is a steam power plant located outside Misurata and owned by the Libyan Iron and Steel Company with 504MW installed capacity, and the second a gas turbine plant located in the Sarir area and owned by the Man-made River Project Authority, with an installed capacity of 90MW.Both plants are old and require major overhauls. The capacity factor for the Misurata plant has been only 12.5% in both 2015 and 2016 while the Sarir plant has been a paltry 2.9% and 2.0% respectively. Since neither owner has taken to steps to overhaul and maintain the units of their power stations, it might be to GECOL’s advantage to arrange the overhauls of at least 2 to 3 of the units at the Misurata plant, thereby adding up to 250MW to the network available capacity. 4. Generation expansion plan: GECOL last carried out a major review of its load forecasts and generation expansion plans in 2007. Since then many factors have changed in the Libyan context. In addition, circumstances in Libya have led to several plants being contracted over the past years outside the original generation planning. It is therefore critical that GECOL carry out new load forecast studies and develop a new generation expansion plan as soon as possible. In line with currently expected new generation and the original expansion plan, we have come up with a worst case and best case scenario for the future growth of the GECOL’s generation and load expectations to 2030, as shown in Figures (1-2) and (1-3). We can see that in the worst case (Figure 1-2), with no additional generation other than what has currently been approved in Tripoli West, Tripoli East, Misurata and Tobruk, and completion of 9 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Ubari and Gulf power stations, as well as resolving the backlog of maintenance by 2024, power shortages will be resolved by 2021, but will come back between 2022 and 2026. This confirms the need for GECOL to proceed with planning and then contracting for new generating capacity, in addition to being aggressive in clearing its backlog of generation maintenance requirements. In the best case scenario (Figure 1-3), with the maintenance backlog cleared by 2019 and contracting for new generation by the early 2020’s, GECOL is able to meet the highest forecast load growth rate, but if no new generation is contracted, GECOL will begin facing new power shortages between 2024 and 2027 depending on the actual load growth rate. Figure (1-2): Available power generation against load forecasts – worst case Figure (1-3): Available power generation against load forecasts – best case 10 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5. Staff development: GECOL has introduced a large number of new power generating units, and more are planned and expected over the next 2 to 3 years. However operations and maintenance staffing numbers in the Generation Department have not grown in line, nor have sufficient numbers of staff been trained to work on the new equipment coming into service. GECOL needs to implement a training program to better prepare its O&M staff to work with the new generating units and to develop a new generation of O&M personnel. Training should also focus on increasing capacities for the expected growth in major overhauls and other maintenance woks. 11 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1.2 Transmission Libya has constructed a strong transmission system, with a 400kV backbone and 220kV main grid. Stringent design criteria were used to ensure a sufficient level of redundancy. The power of the transmission network was witnessed over the past seven years where, despite a large number of lines being damaged by armed conflict and vandalism, the transmission network has continued to be able to supply almost all load centers with their power requirements. Despite this resilience, the Transmission Department, like other business units in GECOL, is suffering from the reduced budgets, from difficult and at times dangerous work conditions, from scarcities in spare parts and equipment required to maintain key elements of the transmission system, and from delays in completing planned additions to the infrastructure such as new substations, overhead lines and cables. The main concerns we have noted in transmission include: 1. Damaged and old substations and switchgear: GECOL has 1 out of 14 400kV substations and 5 out of 86 220kV substation out of service, mostly due to damage by armed conflict and vandalism. GECOL also has some 18 220kV substations that require old 220kV, 66kV and/or 30kV switchgear to be replaced. The absence or age of these substations poses a threat to the stable and reliable operation of the power network. In addition, GECOL has a number of damaged 220kV power transformers. In addition to replacement or repair, the reason for failure of these transformers must be investigated to help prevent similar failures from happening in the future. We have also noted that substation battery systems do not last for their expected lifetimes and suggest battery maintenance needs to be improved and expanded. 2. Overhead lines maintenance and cleaning: GECOL has several overhead lines still damaged as a result of armed conflict in various parts of Libya, with most currently in the Benghazi Region. GECOL has been successful in repairing most line damage quickly after it happens, and a similar effort now needs to be made to repair the remaining overhead lines not in service. From the 1990s, GECOL has also improved the availability of its transmission overhead lines by instituting an annual cleaning program for the line insulator strings. Over the past few years it has been more difficult to carry out these annual cleaning works because of power network constraints making it difficult to switch off lines. Local security concerns have also been a factor in some cases. To maintain the transmission in a reliable working condition the line cleaning efforts should resume. Overhead line teams need to be equipped with the vehicles and equipment they need. In the longer term, GECOL can also consider moving towards live line maintenance and cleaning of the overhead lines. 3. Staff training and development: GECOL staff require additional training to deal with key aspects of the transmission systems, such as new DCS systems in modern 12 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE substations, in battery and DC system maintenance, to develop a new generation of overhead linesmen, and to maintain the skills of cable jointists. 13 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1.3 Control GECOL has had control centers to monitor and control its generation plants and transmission system since the 1970s. The modern GECOL control infrastructure includes a National Control Center (NCC), two Regional Control Centers in Tripoli and Benghazi (TRCC and BRCC respectively), and Distribution Control Centers (DCC’s) around the country. By 2011, the NCC (based in Sirt with a backup in Tripoli) and TRCC were operational with full functionality and the BRCC was in progress of being replaced with a new system to unify the hardware and software base with the NCC and TRCC. A project was also underway to establish 10 new DCC’s that would provide modern control facilities to the Medium Voltage and Distribution networks. During the events of 2011 the NCC in Sirt was put out of service. DCC buildings and equipment were also damaged in several areas. The NCC moved to its back up system in Tripoli. Subsequent to 2011 the DCC project changed its focus to 5 of the original 10 control centers in relatively advanced degrees of progress and which could still be put in service. The Tripoli DCC was almost completely commissioned when work came to a stop again in 2014. Site tests had also started in Zawia and were planned for Benghazi. Upgrades were also arranged for the NCC and TRCC and commissioning tests for BRCC. Currently, we consider the main points of concern in the Control area to include: 1. NCC and TRCC: The hardware and software systems are now over 10 years old and need to urgently be upgraded. Network data at the control centers is very poor at only 20%. A concerted effort must be made resolve the problems in the substations and the communications network causing the deterioration in available data to the control engineers, without which they are very constrained in their ability to manage the power system. Particular effort must be made to repair the many fiber optics that are damaged and that carry the data between the control centers and the substations. The network is currently operating in a very stressed condition, and it is important to provide some spinning reserve to add to system security and stability. Also AGC functionality must be put back into operation. Finally, GECOL should proceed with establishing a new backup control center for the NCC outside Tripoli. 2. BRCC: Control engineers at the BRCC must contend with two separate control systems, an old one and a new one, neither of which is fully functional. It is therefore important to complete and commission the new control system and shift all control functions to it. Benghazi also suffers to similar data problems as the TRCC, with only a third of substation visible to the SCADA system and much data missing, and a similar plan of action is required to resolve the poor data situation. BRCC operators must also regain their control functionality over network switchgear and not be dependent on operators at each substation. 14 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3. DCC’s: Project works have stopped since 2014. Contractual problems may require renegotiations or new contracts to be put in place, and GECOL should refocus on at least completing the initial 5 distribution control centers. 4. Staff and control functionality development: It is critical for GECOL to resume a project similar to that underway before 2011 with the French utility and consultant RTE, to both develop its control staff capabilities and skills and to develop the procedures, codes and regulations key in maintain a large and growing system such as GECOL’s under control and coordinated. 5. Load growth: Despite Libya’s instability and financial difficulties, consumer load has continued almost unrestrained at some 4% per year since 2011. GECOL should begin instituting demand side management programs to limit the future growth, especially when political and financial stability return and the economy begins to recover and grow, otherwise GECOL will be hard pressed to construct new generation capacity to keep up with the load demands. 15 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1.4 Medium Voltage GECOL’s medium voltage networks spans almost 9000km of 30kV and 12000km of 66kV overhead lines and underground cables. The points of concern identified include: 1. Rising fault rates of 66kV and 30kv feeders: While fault rates were falling up to 2010, they began significantly increasing again since 2014. In particular fault rates of 30kV cables seem to be especially high. There appear to be several reasons behind these high fault rates, such us solidly earthed 30kV networks with the earthing resistors bypassed, incorrect bonding and sheath earthing of the 30kV cables, and bad handling and laying procedures during installations works of the cables. 2. Old substations and switchgear: The GECOL network includes old oil type circuit breaker and some newer vacuum type switchgear for which spare parts are no longer available, in total about 80 substations and 200 circuit breakers. These equipment need to be replaced as soon as possible to maintain the reliability of supply of the power system and safety of personnel of O&M personnel. 3. High transformer fault rates: Over 100 66kV and 30kV substation are operating with one transformer because of failure of the second transformer. Several reasons have been identified for these failures, including overvoltages during minimum load times because automatic voltage regulation is not put in automatic mode to maintain system voltage through the transformer on-load tap changers. Transformer oil is also topped up or filled without being treated first, allowing humidity to enter the transformer. Similarly the silica gel breathers may not be maintained to prevent humidity entering through the conservators. 4. Large amounts of materials for new substations and overhead lines, part of 66kV and 30kV development contracts that have stopped, are lying in various stores subject to poor storage conditions, vandalism and theft. If they are not utilized soon, their value could be lost to GECOL for ever. 5. Skills development: Staff need additional training and development in the areas of cable jointing and termination, DC supply systems and batteries, system and equipment earthing, transformer and preventive maintenance, and implementation and compliance with GECOL’s technical standards. 16 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1.5 Distribution The GECOL Distribution system includes almost 95,000km of 11kV and LV lines and cables, as well as 70,000 11/0.4kV transformers and 12,000 switching stations and package substations or ring main units (RMUs). We have noted the following points of concern relating to these networks: 1. High failure rates of ground mounted and pole mounted distribution transformers: GECOL has amassed large numbers of faulty distribution transformers. These failures have been due to multiple factors, including network overvoltages during minimum load hours because AVR’s controlling on-load tap changers are left out of service or in manual position, thereby not acting to maintain a stable network voltage, overloaded transformers during peak load hours, poor ventilation of indoor transformers, lighting and surge protection not installed or incorrectly installed for outdoor transformers, unsafe and uncovered transformer bushings in many of the older ground mounted indoor transformers, as well as poor transformer maintenance and addition of untreated transformer oil. Set up of transformer repair workshops will help clear the large collection of faulty transformers and reduce the investments in new transformer supplies. 2. Old switchgear and ring main units, incorrectly installed equipment and modified switchboards: Old oil type switchgear and ring main units have come to represent a hazard to the safe and reliable operation of the distribution network and to operating staff. These need to be replaced with new vacuum based equipment as soon as possible. It has also been found that most ring main units are installed without the earthfault alarm and indication apparatus or it is not put in service. This results in repeated closures on to a fault as operations staff tries to identify the faulty section of a ring. In many stations the low voltage switchboard has also been modified, bypassing MCBs to avoid tripping of feeders subject to overloads. All these result in faults to network equipment, degradation of the distribution system and poor quality of supply to consumers. 3. High rate of serious and fatal accidents: The distribution department appears to have the highest accident rates in GECOL, too many of them serious to fatal. It is clear that there is ignorance of safe work procedures and compliance with safety rules. Staff are also not equipped with the necessary personal protective equipment that would help reduce the impact of accidents or prevent them. GECOL needs to work to instil a safety culture in the company and to provide the equipment and tools necessary to all staff, to renew its safety rules and ensure they are understood and complied with, and to develop and communicate a strong safety policy. 4. Skills development: Staff need additional training and development in the areas of DC supply systems and batteries, equipment earthing, transformer and preventive maintenance, implementation and compliance with GECOL’s technical standards, 17 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE and safe work procedures, risk assessment and mitigation and use of the correct personal protective equipment for work environment. 18 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2 Introduction GECOL, The General Electricity Company of Libya, is a vertically integrated utility, the sole provider of electric power services in the country. The core business units of GECOL which cover its main technical activities are represented in its administrative structure by five General Departments: the Generation General Department, the Transmission General Department, the Medium Voltage General Department, the Distribution General Department, and the Control General Department. Libya has invested heavily in its electricity infrastructure over the past decades. Although these investments have been directly funded by the Libyan government through its development budget, GECOL has been the key player planning and orchestrating these investments. The combination of an oil rich nation with a policy of universal electrification and a power utility with stringent criteria on the expansion planning of its system, the result has been a robust power transmission network and ambitious undertaking of generation plant construction projects. On the other hand, the rapid growth of Libya’s population and expansion of its cities and towns has made it more difficult for the distribution system to keep up with the needs of the country. Despite large investments in equipment and networks, GECOL has not been able to keep up with the demands for new supply connections and upgrades to the existing networks as they no longer meet the requirements of their load centers. Since the popular uprising of February 17, 2011, GECOL’s fortunes have taken a turn for the worse, and this is reflected in the operation of its core business units and of the Libyan electricity infrastructure. Insecurity and political instability have led to a halt in most projects, successive assaults on GECOL assets and staff, a large increase in thefts, especially of conductors and electrical apparatus, and a significant decline in GECOL’s ability to carry out maintenance activities. The result has been loss of some infrastructure assets, a fall in the performance of the power network, and a severe shortage in power generation capacity causing long power cuts in many parts of the country, especially during the summer and winter peak load periods. The impact on Libyan electricity supply is reflected in the Global Competitiveness Reports issued by the World Economic Forum (WEF). These annual reports assess the competitive stance of nations through analysis of a multitude of factors, including quality of electricity supply. Over the years, Libya’s electricity supply has been ranked1: - 2008: 71st out of 134 countries (4.6 points out of 7) - 2009: 63rd out of 133 countries (4.9 points out of 7) 1 The WEF Global Competitiveness Report assesses quality of electricity supply on the lack of fluctuations ad lack of interruptions. Data was collected through surveys of businessmen in Libya. Libya was not included in the 2011 report for lack of data and has not been included in the reports issued after 2014. 19 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE - 2010: 81st out of 139 countries (4.3 points out of 7) - 2012: 85th out of 144 countries (4.3 points out of 7) - 2013: 96th out of 148 countries (3.9 points out of 7) - 2014: 116th out of 144 countries (2.8 points out of 7) In fact, it is not an exaggeration to say that only the redundancies built into the Libyan power network and the resilient specifications and design of its systems and components, coupled with what can only be described as heroic efforts by many of GECOL’s workforce, has prevented the collapse of the power network and ensured continued supply of power to the majority of the population the majority of the time. At the same time, Libya has recognized deficiencies in its education system. Libya has one of the highest literacy rates in the MENA region and among developing countries, but the quality of education provided and the ability of graduates to meet the needs of potential employers are inadequate. The latest World Economic Forum’s 2014 Global Competitiveness Report has ranked Libya’s education system 144th out of 144 countries, assigning it 1.9 points out of a possible 7 points. Historically, the highest Libya has scored has been a rank of 121 and a score of 2.6 out of 7. GECOL is greatly overstaffed as a company, but there are large deficiencies in the capable technical personnel necessary to carry out the core business activities. GECOL has had to rely on its own training programs, training as part of new infrastructure projects, and on-the-job training to develop its technical staff, with inconsistent results. This is further compounded by the large geographic area of Libya and over the whole of which GECOL must deliver its services. This report aims to assess GECOL power system assets, to determine their current capabilities and requirements, and to propose an action plan to GECOL on how to recover and improve its technical activities and services. This will be done with a focus on each of GECOL’s technical business units. This report will focus on the current state of GECOL’s system and business units and looks forward to what can be achieved. Historical data will be considered only in so far as it gives perspective and understanding and helps plan the future development of GECOL. Each of GECOL’s technical business units divides its activities into a different number and distribution of geographic regions as is best suited to its functions. To provide unity to this report, while deriving the benefits of regional division and allocation of assets and operations, we have used the following geographic regions in our analysis of GECOL: Western region: The area extending west along the coast from Greater Tripoli to the Tunisian border and southwards to include the Nefousa (Western) Mountains. Major urban areas include Zawiya, Gharyan and Ghadames. 20 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Tripoli region: The area covered by the Greater Tripoli Municipality. The main urban area is Tripoli and its suburbs. Central region: The area east of Greater Tripoli and extending along the coast to include the Sirt Municipality up to the town of Ras Lanuf, and southwards to include the Houn Municipality. The main urban areas are Khums, Misurata, Sirt, Beni Walid and Houn. Southern Region: The desert area south of the Nafousa Mountain and Houn Municipality, up to the Algeria, Niger, and Chad borders. The main urban areas are Sabha, Ubari and Ghat. Wahat region: The area extending from the Agedabia Municipality along the coast southwards to the Chad, Sudan and Egyptian borders. The main urban areas are Agedabia, Jalo and Kufra. Benghazi region: The area covered by the Greater Benghazi Municipality. The main urban area is Benghazi and its suburbs. Eastern region: The area east of Benghazi extending to the Egyptian border. The main urban areas are Marj, Beida, Derna and Tobruk. Regardless of what is presented in this report, we should point out that GECOL is not standing still. GECOL is itself making great efforts to resolve its many problems and to deal with the obstacles and difficulties the current Libyan political and security situation has created. GECOL has also continued to expand and grow its power network despite the cessation of most other project activities in Libya and general financing difficulties. Just at the transmission level and the first half of 2017 GECOL has:  Brought online 2 new gas turbine unit (Khoms Fast Track and Tripoli West)  Completed a major overhaul and put back in service Unit 5 and Western Mountain Power Station  Put in service 4 new 30kV overhead lines  Put in service 3 new 220/30kV and 220/66kV transformers  Put in service 4 new 30/11kV transformer While we commend GECOL on its continued efforts and activities under the most adverse conditions, these accomplishments represent only a fraction of what is needed for GECOL to meet its obligations towards the electricity consumers in Libya. This report does not purport to be an exhaustive analysis of every aspect of GECOL’s technical activities, nor is it re-inventing the wheel. The data and information in this report have been collected with the strong and total support and assistance of GECOL’s management and staff, whom we thank profusely. Thus, the details and results of the study are not new material and are already well known to GECOL and its management, who are working hard at resolving the issues discussed. This report attempts to present new 21 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE perspectives on these issues, to highlight priorities and some of the urgent actions needed, and help to GECOL in the decision-making process. It is our sincere hope we have been at least partly successful in achieving these aims. 22 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (2-1): Geographic regions used for GECOL’s electricity assets and services 23 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3 Generation 3.1 Current status 3.1.1 Overview To assess GECOL’s generation assets, we have collected data from GECOL’s Generation General Department and from the Control General Department, made site visits to Tripoli South, Khoms and Benghazi North Power Stations , and had discussions and interviews with GECOL management at various levels. Depending on how they are tabulated, GECOL has some 26 power stations containing 85 generating units of various sizes, technologies and ages distributed around Libya, with the majority along Libya’s Mediterranean coastline. Figure (3-1) shows the geographic location of GECOL’s generation assets and Tables (3-1) and (3-2) present a summary of the GECOL power plants and their main data. Figure (3-1): Location of GECOL generation plants 24 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Recently GECOL has carried out a review and revision of the power plants it categorizes as “in service”, and has officially confirmed an installed capacity of 10.238GW for the year 2017. Of this installed capacity, the actual available capacity is a fluid concept that varies continuously as maintenance, fuel and other factors reduce some units’ power capability and other units are taken out of service or brought back into service due to maintenance activities. The variations in plant availability is clear from Figure (3-2), which is derived from GECOL’s General Control Department quarterly reports for 2015 and 2016. Our survey shows an available capacity during the July/August period of 2017 (updated in November 2017 to reflect units with significant change to status) of around 5.345GW, representing 52% of the installed capacity. Figure (3-2): Availability of different types of generation, from GECOL Control reports Based on a review of the conditions of GECOL generation assets, it is our opinion that at least 19 units aged between 33 and 46 years (shown shaded in Table 3-1) are also ready for retirement and should not be considered part of GECOL’s installed capacity, and we have not included these units in this assessment. The excluded units from Table (3-1) are: Misurata Gas Turbine Power Plant, 4x15MW, in service since 1984 Abu Kamash Gas Turbine Power Plant, 1x15MW, in service since 1982 Benghazi North Steam Power Plant, 2x40MW, in service since 1978 Tripoli West Steam Power Plant, 2x65MW, in service since 1976 Lamluda Gas Turbine Power Plant, 1x33MW, in service since 1975 Zliten Gas Turbine Power Plant, 3x15MW, in service since 1975 Tripoli South Gas Turbine Power Plant, 2x30MW, in service since 1972 Furnaj Gas Turbine Power Plant, 2x15MW, in service since 1971 Zahra Gas Turbine Power Plant, 2x15MW, in service since 1971 We note that all these plants do not currently contribute any generation capacity, i.e. they are all out of service for various reasons, and therefore are not producing power. 25 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Excluding these generating units leaves 18 “main” power stations with 66 generating units and an installed capacity of 9.755GW. The 5.345GW available capacity now represents 54.8%. In Table (3-2), 2010 has been taken as a reference year, being the last in which operation of GECOL network may be considered “normal”. 2013 was taken as a comparison year during which many activities had begun to return to a form of normality after the events of 2011, and 2016 reflects the current status of GECOL’s assets. Figures (3-3), (3-4) and (3-5) represent GECOL’s installed and available capacities and their distribution over Libya’s geographic regions, their split between generation technologies, and by age of units. Figure (3-3): GECOL generation by region (mid 2017) 26 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Table (3-1): GECOL power plants and generating units sorted by age - general data as at mid 2017 27 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Table (3-2): GECOL power plants sorted by age - operational data 2010, 2013, 2016 28 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (3-4): GECOL generation by technology (mid 2017) Figure (3-5): GECOL generation by age (mid 2017) Figure (3-2) shows that there is a fairly reasonable distribution of generation geographically around Libya, with the following reservations:  There is no generation in the Southern region. As a result this region has faced extensive and prolonged power outages compared with other parts of Libya, as well as voltage instabilities over the past few years. The new Ubari power Station is expected to be commissioned by the end of 2017 or early 2018 and should be an important factor in solving the Southern region’s problems. 29 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE  The generation in the Eastern Region is limited to two aging steam power plants, both over 30 years old. Their generating units are severely downrated or out of service pending major overhauls. The absence of any significant generation in the Eastern Region and the region’s dependence on the Benghazi North power plant as the sole source of energy when the eastern and western power networks were isolated was the major reason for successive blackouts over most of the eastern towns and cities. There have been calls and plans for a new power plant in Tobruk for many years, but it is only recently, as detailed in the section on Generation Expansion, that any progress appears to have been made. It is now expected that a new plant in Tobruk will be contracted and be in operation around 2020/2021. Figure (3-3) shows that there is a very large imbalance in generation units in favour of gas turbines. The bulk of GECOL’s generation is currently simple or combined cycle gas turbines. This, despite the higher operating costs and maintenance requirements of these gas turbines. As will be discussed later, much of GECOL’s current shortage in generation is because GECOL has not been able to keep up with the inspection and overhaul schedules of its gas turbine units. This has led to many units either being completely out of service or operating but with reduced power capabilities. The disparity in generation technologies is further reinforced in Figure (3-4) which shows that almost all GECOL’s steam power plants are over 30 years old. In fact, the new Gulf (Khaleej) Power Station is the first and thus far only steam power station to be contracted by GECOL since the early 1980’s. GECOL has been operating its power stations since 2011 under some extremely adverse conditions. The effect is clearly seen in the operational data. The weighted average time availability2 of power generating units has fallen from 78.3% in 2010 to 66.0% in 2016, despite Khoms Gas 1, Khoms Steam and Misurata Combined Cycle plants having availabilities exceeding 90%. Similarly, the average weighted capacity factor3has fallen from 45.6% in 2010 to 44.3% in 2016, this despite the fact that all available units are being treated as base load because of the power shortage, operating at full available capacity throughout the day over much of the year, although this will explain why the change in capacity factor has been so small. The most striking indication of the situation GECOL’s power plants face is the available capacity of power generation compared with the installed capacity. This fell from 64.6% in 2 Availability was calculated based on the operating hours of each unit at the power station over the year ∑ ℎ / = . × ℎ ℎ 3 Capacity factor was calculated based on the total energy output of each unit at the power station over the year ∑ ℎ / = × ℎ ℎ 30 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2010 (5.683GW available out of 8.796GW installed, which includes units put in service during 2010) to 52% at present, 4.9GW of the 2017 installed 10.238GW4 capacity being unavailable. Our survey indicates that up to 2.6GW of that 4.9GW is due to factors related to maintenance, repair and replacement works. Figure (3-6) gives a breakdown of unavailable generating power in the GECOL power system. Figure (3-6): Breakdown of unavailable generating capacity in GECOL system From Figure (3-6) we see that if GECOL resolved its fuel supply problems and carried out overdue overhauls and maintenance works of its units, it should be able to theoretically increase its available capacity from the current figure of around 5345MW to over 7300MW, about equal to the current peak network demand. Resolving these matters is not a simple matter, however, as is discussed in more detail in the following sections. An additional1208 MW is available through major and complex maintenance works, i.e. works that will generally require over 4 months of work. However, most of these relate to overhauls of ageing steam power stations that have been in service for 32 years or more, and a more detailed evaluation is required to determine their cost effectiveness. 4 Excluding units considered as ready for retirement 31 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Notable from the graph is that an average of 1053 MW is unavailable due to ambient conditions that derate the power capacity of gas turbine units. As a result, and taking into consideration the units that should be retired from service, GECOL’s existing installed capacity can generate on average a maximum of 8700MW, even if all units were fully maintained and in optimal working conditions. More positively, there have been significant improvements in the thermal efficiency of GECOL’s generation. While the aggregate improvement in efficiency is 76.1%, the actual overall improvement in GECOL’s generation efficiency taking into consideration those plants that were in service 2010 is 7.3%, with Benghazi North 2 and Misurata Combined Cycle power stations accounting for 4.9%. The largest factor accounting for the increased efficiency has been the introduction of the heat recovery steam generation (HRSG) units at these combined cycle plants and the operation of their corresponding steam turbines in 2013. The second contributing factor has been GECOL’s increased operation of generating units on natural gas instead of liquid fuel. While in 2010 only 41% of energy produced was from natural gas, in 2016 this had grown to 80%. No. Power Station Unit No. Nameplate Rating Year in service 1 Western Mountain GT16 156 MW 2012 2 Sarir Gas (Main) GT2 285 MW 2012 3 GT3 285 MW 2013 4 Benghazi North 2 CC ST30 250 MW 2013 5 Misurata CC ST1 250 MW 2013 6 Gulf 1 350 MW 2014 7 Zawia Gas (Small) GT1 25 MW 2014 8 GT2 25 MW 2014 9 Tripoli West Gas (Small) TM24 25 MW 2014 10 TM25 25 MW 2014 11 Tripoli South Gas (Small) GT16 47MW 2016 12 GT17 47MW 2016 13 Khoms 2 (Fast Track) Gas 2 262.5 MW 2016 14 1 262.5 MW 2017 Total 2295 MW Table (3-3): New GECOL generation after 2011 Another positive element we should mention is that GECOL has managed to put in service some 14 new generating units with a total nameplate rating of 2295MW between 2012 and August 2017, this despite all the instability, financial difficulties and the almost complete halt of all other international supply and erection projects in Libya. Several of these units were arranged ad hoc to deal with the power shortage problem and not part of the original generation expansion plan. Table (3-3) lists the units added to the Libya network. Further to this list, at some of the new units at Ubari Gas Power station are also expected to come on line before the end of 2017, adding up to another 624 MW to the installed capacity. 32 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Deep-dive site visits to a number of power stations have also highlighted some practical aspects of operations that should be taken into consideration. We have noted that many of the maintenance and operations staff at the power stations are of a similar generation and approaching retirement age. They have not been supported with enough numbers of younger engineers and technicians to apprentice under them and learn from their experience and skills. This can lead to a serious gap in the future, but even in the short term there do not seem to be enough qualified and capable technical staff at the power plants to meet all its needs. In one case, At Khoms 2 Power Station, according to plant management the daily operations shift has about half the number of persons recommended by the new units’ supplier. This shortage in specific technical positions exists despite the overstaffing in GECOL overall and the high numbers of people that have been newly employed by GECOL over the past few years. Equally important is the training of operations and maintenance staff on the new units that have come into service over the past five years as well as the units we can expect to be commissioned in the coming years. The training that has been received is minimal, and may be sufficient for normal daily activities, but it is doubtful they will be fully capable of responding to and dealing with unexpected, abnormal and emergency situations. 3.1.2 Overdue maintenance GECOL’s low rate of available capacity is due to a multiple of reasons. The most important is the growing back log of required maintenance works and replacements of parts. In particular, major overhauls and other major maintenance works of a growing number of gas turbine units and steam turbines units is overdue. Over 40 of GECOL’s 68 generating units require some form of maintenance works maintenance works. The full list of overhaul works due, completed and pending are given in Table (4). We have expanded the analysis of maintenance works required for GECOL’s generating units, separating the more complex and difficult maintenance needs from the less complex. The latter are works which are considered routine and regular for the relevant generating units and/or which would normally require four months or less to complete. Periodic major overhauls of gas turbines are included in this category. Table (3-5) provides a comprehensive list of the less complex maintenance works required for GECOL generating units. From the table we see that out of an installed capacity of 5374 MW, it should be possible to regain up to 1700 MW of lost power through these less complex maintenance activities. This compares with the more complex maintenance requirements which are the cause of up to 1200MW of power lost to the Libyan power network. Most of the more complex works are major overhauls of steam turbine units which are over 30 years old, and some nearing 40 years. Because of the age and condition of these units, GECOL needs to assess the viability 33 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE and cost-effectiveness of rehabilitating these units before deciding to invest the required funds. It should be noted that GECOL is making great efforts to meet the maintenance needs of its generation and that over the coming months, as in the past, we can expect GECOL to continue to work at resolving the existing problems and maintenance needs. GECOL’s inability to keep up with the major maintenance requirements of its generating units is not new. GECOL has generally faced a backlog of overhauls and other major maintenance works as can be seen from the Booz and Co. analysis in 2010 (Figure 3-7). While there was some catch-up in 2007, the backlog continued to grow in 2008 and 2009. The events since 2011 have further magnified this problem as can be seen in Figure (3-8). Figure (3-7): GT unit overhauls analysis by Booz & Co, GECOL Strategic Plan 2010 Figure (3-8): Generating unit overhauls analysis 2010-2017. (Overhauls are counted in the year they are completed) 34 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Table (3-4): Generating units overhauls 2010 to 2017 35 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE A combination of political and security instability and financing shortfalls have hindered GECOL in carrying out the overhaul and maintenance works they had planned and needed to maintain the functional capacity of installed generation. The factors preventing from implementing the maintenance works are:  The unbalanced growth of gas turbine generating capacity over the last three decades. The maintenance requirements of gas turbines is much higher than for steam turbines and therefore the allocation of sufficient funds on an annual basis to keep the units in top operating condition is also much greater.  Overhaul financing under the Libyan development budget. Overhauls are considered a capital investment and are therefore funded under the Libyan development budget. Provision of funds is thus not in GECOL’s hands but is subject to government budget negotiations and approval. Further and repeatedly over the past decades, even monies allocated in the development budget are not always made available by Ministry of Finance or the Central Bank of Libya.  Specialist characteristic of the maintenance works. Carrying out the overhaul works requires specialist personnel with the proper knowledge and experience. GECOL has worked to develop this expertise locally, both internally and in its subsidiary contracting companies, with a certain degree of success. However, even when local maintenance crews are capable of carrying out the overhaul works, GECOL still requires supervisors from the equipment manufacture to oversee the overhauls to guarantee the quality and assume responsibility for the works. The current situation in Libya has prevented the attendance of these supervisors at the power plants in Libya to allow the works to proceed.  Large backlog in required maintenance being carried forward from past years. This backlog means that GECOL does not only have to find funds for the overhauls that become due on an annual basis, but also to the large number of units that were not overhauled on schedule year after year.  Figure (3-8) indicates that in 2017 there were 34 generating units that were due for an overhaul. Up to November 2017, GECOL has been able to complete three unit overhauls. Since 2006, the largest number of overhauls GECOL has been able to carry out in one year was 10, in 2007, and the average number per year is around 5. To resolve the overhaul backlog by the end of 2020, GECOL will have to increase its capacity to carry out overhauls to approach 15 units per year as well as to arrange the necessary financing.  It will be noted from Figure (3-8) that GECOL began making headway to clear the backlog in 2015 and 2016, mainly through a concerted effort by GECOL’s management. This progress has been offset in 2017 partly by the significant increase in the number of units per year that require overhaul and by the growing budgetary constraints Libya finds itself in. The increase in required overhauls is mostly due to 36 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE the continuous hours of operation forced on GECOL’s available generating capacity because of the power shortages. Power Year in Unit Nameplate Available Lost Unit Required maintenance station service type rating power5 power6 Zawia GT-11 2000 Gas 165 MW 145 MW Major overhaul Zawia GT-12 2000 Gas 165 MW 145 MW Major overhaul Repair oil leak + major Zawia GT-13 2000 Gas 165 MW 130 MW 15 MW overhaul Repair unit Zawia GT-14 2000 Gas 165 MW 0 MW 145 MW transformer + major overhaul Zawia GT-15 2005 Gas 165 MW 150 MW Major overhaul Zawia ST-10 2007 Steam 150 MW 130 MW Major overhaul Zawia ST-20 2007 Steam 150 MW 70 MW 60 MW Major overhaul Zawia ST-30 2007 Steam 150 MW 130 MW Major overhaul Major overhaul + Benghazi repair compression GT-13 1995 Gas 150 MW 0 MW 130 MW North 1 blades + replace unit transformer Benghazi GT-14 2002 Gas 165 MW 140 MW Major overhaul North 1 Benghazi Minor repairs + Major GT-31 2010 Gas 285 MW 230 MW 20 MW North 2 overhaul Benghazi Repair hydraulic ST-30 2013 Steam 250 MW 105 MW 115 MW North 2 system controls Misurata GT-31 2010 Gas 285 MW 250 MW Major overhaul Misurata GT-32 2010 Gas 285 MW 0 MW 250 MW Maintenance works Replace seawater Misurata ST-1 2013 Steam 250 MW 115 MW 105 MW pump Repair cause of Tripoli GT-11 1994 Gas 100 MW 65 MW 20 MW vibrations + Major South overhaul Tripoli GT-12 1994 Gas 100 MW 85 MW Maintenance South Tripoli GT-13 1994 Gas 100 MW 85 MW Maintenance South 5 Available power according to data collected in June/July 2017, updated in December 2017 for units with significant changes in their status. 6 Exact power lost and can be regained through maintenance is not a fixed figure for GT units and relates to ambient conditions that vary over time. The estimated lost power is therefore rounded to nearest 5MW. 37 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Tripoli GT-14 1994 Gas 100 MW 85 MW Maintenance South Tripoli GT-15 1994 Gas 100 MW 85 MW Major overhaul South Khoms 1 GT-03 1995 Gas 150 MW 100 MW 30 MW Major overhaul Khoms 1 GT-04 1995 Gas 150 MW 130 MW Major overhaul Available Power Year in Unit Nameplate Lost Unit rating Required maintenance station service type rating power (mid 2017) Western GT-12 2005 Gas 156 MW 130 MW Major overhaul Mountain Western Repair problem with GT-13 2006 Gas 156 MW 50 MW 85 MW Mountain support bearings Western Repair hydraulic oil GT-14 2006 Gas 156 MW 100 MW 35 MW Mountain pump Western GT-16 2012 Gas 156 MW 130 MW Major overhaul Mountain Zweitina GT-11 1994 Gas 50 MW 0 MW 43 MW Major overhaul Zweitina GT-14 1994 Gas 50 MW 0 MW 43 MW Major overhaul* Sarir GT-1 2010 Gas 285 MW 190 MW 60 MW Major overhaul Sarir GT-2 2012 Gas 285 MW 0 MW 250 MW Major overhaul* Replace damaged Sarir GT-3 2013 Gas 285 MW 0 MW 250 MW parts + Major overhaul Kufra 1 1975 Gas 25 MW 0 MW 22 MW Major overhaul Kufra 2 1975 Gas 25 MW 0 MW 22 MW Major overhaul TOTAL 33 5374 MW 4004 MW 1700 MW * Units have limitations due to both fuel supply constraints and maintenance requirements Table (3-5): Listing of GECOL generation units requiring less complex or routine maintenance The same factor of power shortages will make it very difficult for GECOL to make rapid progress in clearing the overhaul backlog, even if all other factors are resolved. Unit overhauls generally require shutdown of a generating unit for 3 or 4 months, and it will be extremely difficult for GECOL to arrange simultaneous shutdown of multiple generating units simultaneously with the increased power cuts that will require, given that most units are still able to generate into the GECOL power network, even of at a reduced capacity. For this reason, also, GECOL generally limits its overhaul programs to around 6 months of the year, in spring and autumn, when power demand is at its lowest and the consequences of taking units off-line are less severe an easier to manage. GECOL has made agreements with service providers to help resolve the overhaul backlog. It has agreements with Algec, a joint venture company in which GECOL has a majority stake, to carry out overhauls of Alstom/GE turbines. It had been expected that overhauls of at least 2 and possibly up to 4 of these units would start before the end of 2017, although by the time of this report that has not been the case. Similarly, a service agreement has been signed 38 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE with Siemens to cover the overhauls of Siemens gas turbine units. Putting these agreements into effect will require GECOL to ensure the necessary funding from the Libyan government authorities. 3.1.3 Fuel supply Another important factor limiting capacity availability is fuel. Almost all GECOL’s power stations have been adversely affected by the supply of fuel in one way or another. Fuel affects power production by several means. Most critical is the very availability of fuel. Insecurity and instability in Libya have led to fuel sources supplying power plants being repeatedly cut off. But this is only one aspect of the supply of fuel. Another is the growing dependence of power plants on gas as the primary operating fuel. Both the gas pipeline infrastructure and the production of natural gas are unable to keep up with demands. In several cases smaller or less important power generating units are being taken off line to ensure there is sufficient natural gas or sufficient pressure to keep the larger and more important units in operation. Similarly, less critical or less sensitive units are being switched to LFO operation so the more critical or sensitive units can operate on gas. This is despite the higher direct and indirect costs of using LFO. Supply of fuel to power stations is either by pipeline, by ship unloading through sea terminals, or by truck over land. In the case of supply from the sea, and with the growth in size and number of units at power plants such Khoms, the fuel storage capacity is a constraining factor when liquid fuel is being used. The high rates of fuel consumption, the limited number of fuel shipments that can be made, and the dependence on liquid fuel because gas supplies are insufficient to operate all the installed units, means that fuel in the tank farms is almost expended when new fuel deliveries arrive. The newly arrived fuel is thus consumed almost directly by the operating units without being allowed to settle or being properly analyzed and checked. Also the need to keep units continuously operating does not allow for substandard shipments to be refused, since the remaining fuel stock is insufficient until another fuel shipment can be arranged. Where deliveries of liquid fuel can only be made by road, the logistics of supply is a further complicating factor. Large power stations will require a constant stream of trucks arriving at the plant and unloading. This is both a high cost operation, a cause of congestion on roads leading to the plant, and in some cases these trucks have to travel hundreds of kilometres in each direction to load and then deliver the fuel. For large plants this can become impractical, causing units to be kept off line or at least reducing their available capacity in accordance with the limited supply of fuel. The Libyan National Oil Corporation (NOC) has confirmed that it is committed to supplying GECOL with the quantities required by all its power plants. NOC has confirmed there is limited scope to expand the supply of natural gas as a fuel, but LFO and HFO will be supplied as needed. This implies that more and more generating units in the GECOL system will be 39 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE forced to operate on liquid fuel rather than natural gas, with the implications on cost of operations, increased maintenance requirements and lower load capacity of the generating units. In addition, some GECOL power plants, and in particular Sarir, Kufra and initially Ubari, do not have fuel pipelines or fuel supply jetties and require fuel to be brought in by road from great distances, a great logistical challenge as described above. Over the past few years, the NOC and Brega Oil Marketing Co have had to increase their dependence on importing both LFO and HFO fuels to meet local needs, including GECOL’s. This has resulted in another element affecting available capacity. In most cases, fuel is imported to NOC fuel terminals, where NOC is responsible for quality assurance and compliance with specifications and standards. However, a number of GECOL power plants have their own ful supply jetties and tankers unload imported fuel directly into the plants storage tanks, bypassing the NOC’s fuel supply quality control system. As a result, t he quality of imported fuel at these plants has often not been to the standards required by the generating units. This leads to downtime for increased maintenance and replacement of filters and other parts. In the case of one of the new Fast Track gas turbine units installed in Khoms, the quality of the fuel has been the alleged cause of damage and led the contractor to decide to replace all the unit’s fuel nozzles. We note here that GECOL power plants in general do not have the facilities to analyze the fuel they are receiving. Such analysis can only be made in external laboratories at it is therefore impractical to confirm the suitability of fuel before accepting a shipment. In fact, power plant staff are mostly limited to visual and olfactory checks when assessing the fuel they receive, are unlikely to be able to act on deliveries based on such rudimentary and subjective checks. According to the information we have collected, at least 600MW of lost capacity is directly attributed to fuel supply, but we feel the actual figure is actually higher. Many of the units that are out of service or operating under reduced load limits because of maintenance related reasons would also have had to be kept offline or operated at reduced capacity because of limited availability of fuel. 3.1.4 Third party power stations In addition to GECOL’s 9.765 GW of installed capacity, there are two power stations owned by third parties that are also connected to GECOL’s power grid. One is a steam power plant located outside Misurata and owned by the Libyan Iron and Steel Company, and the second a gas turbine plant located in the Sarir area and owned by the Man-made River Project Authority. These plants are listed in Table (6).Both plants were originally built to supply the systems of their respective owners, but they also supply GECOL’s customers with any excess power, and GECOL and these third parties periodically balance their accounts for the total net amount of energy imported from or exported to the GECOL system. However, both plants are old; each has only one unit currently in service. The capacity factors for the 40 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Misurata plant has been 12.5% in both 2015 and 2016 while the Sarir plant has been a paltry 2.9% and 2.0% respectively. The future of the power stations and their generating units is in the hands of their respective owners. However, and especially in consideration of the power shortages Libya is currently facing, GECOL has a direct interest in the operation and maintenance of these plants. GECOL is therefore seriously assessing the possibility of directly arranging and even financing major overhauls of the steam turbine units in Misurata. If they can be put back in service at full capacity, up to an additional 500MW of power can be made available to GECOL. Misurata Iron and Steel P/S Sarir MMRA Gas P/S Owner Libyan Iron and Steel Co. Man-made River Project Authority Region Central Wahat Type Steam Gas Year in service 1990 1982 No. of units 6 6 Unit nameplate rating 84 MW 15 MW Total installed capacity 504 MW 90 MW Total available capacity 60 MW Possible fuels HFO / Gas LFO / Gas Plant efficiency 2010 27.6% 21.09% Plant efficiency 2013 26.04% 17.36% Plant efficiency 2016 25.01% 9.91% Plant capacity factor 2010 28.7% 45.8% Plant capacity factor 2013 16.2% 5.1% Plant capacity factor 2016 12.5% 2.0% Table (3-6): Power stations owned by 3rd parties 3.1.5 Generation expansion Since 2011 GECOL has put great effort into restarting its stalled generation expansion program. Projects that had come to a halt during the 2011 uprising have been resumed and even some new works were contracted. Between 2012 and the time of this report, GECOL has managed to bring on line 14 new generating units in 9 different power plants, representing an additional 2295MW of installed capacity. Of its existing generation plant contracts, two are still in progress. These are Ubari gas turbine plant in the Southern Region, and Gulf (Khaleej) steam power station in the Central Region. Work has recently resumed at Ubari and it is expected the first unit of 156MW will be in service before the end of 2017. The remaining Ubari units should follow over the following weeks, and the plant should be fully operational by early 2018. 41 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE However, the local electricity infrastructure means the plant will be connected to GECOL’s power network in a suboptimal manner. The first two units to be completed will be connected to an existing 220kV substation over an overhead line connected directly to the unit transformers. The last two units will be connected through a substation adjacent to the plant but currently still under construction. It will be some months before this configuration is rationalized and all the units are connected through the plant’s new substation. More important, and a potential source of constraint on the operation of the plant is the source of fuel. No pipeline currently exists to supply the plant with either HFO or gas. The plant will therefore have to be supplied by truck until a new pipeline is completed, and the logistics of supplying 4x156MW units with sufficient HFO to keep them fully operational at Ubari’s location in the Libyan desert will be large, especially in light of the current security situation. Estimated No. of Nameplate available Year in P/S Region Type units rating capacity service Ubari Southern Gas 4 4x156 MW 4x125 MW 2018 Gulf Central Steam 37 3x350 MW 3x350 MW 2019-2021 Tripoli West Tripoli Steam 4 4x350MW 4x350 MW 2021-2023 Tripoli West Tripoli Gas 4 4x167 MW 4x145 MW 2019-2020 Tripoli East Tripoli Gas 2 2x127 MW 2x110 MW 2020 Misurata Central Gas 2 2x320MW 2x280 MW 2019 Tobruk Eastern Gas 4 4x185MW 4x160MW 2020 TOTALS 23 5376 MW 4950 MW Table (3-7): Under construction and to be contracted generation plants Work at the Gulf Power Station has still not resumed. The plant is located just outside Sirt city, where serious fighting ended only a few months ago. The security situation in the area is still not fully settled, and it is unknown when the contractor will return to the site to finish works on the remaining three units. However, considering the continuing developments in Libya’s political and security situation, we can be reasonably confident that the power station should be in service between 2018 and 2019. 7 Gulf Power Station has 4 steam turbine generators. However, one is already in service, so only 3 units are considered to still be under construction. 42 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Very recently, GECOL has also announced obtaining funding for four new gas turbine power plants. According to GECOL, these plants will be contracted before the end of 2017 and projects works are expected to start by the end of 2017 or in early 2018. Plans for these plants have developed relatively suddenly in response to the power shortages faced by Libya. Table (3-7) summarizes the generating capacity expected to be completed in the short term, consisting of the 2 plants currently under construction and the four plants recently announced. 3.1.5.1 Best-case generation growth scenario To assess the future generation capability of GECOL, we have considered two scenarios, what may be considered a best-case scenario with an aggressive program to eliminate the backlog of overdue maintenance works and have all existing units in optimal working condition as well as completing all current generation projects and contracting for all originally planned units, and a worst case scenario where current units are rehabilitated slowly, current projects are completed but no new generation is then further contracted. In these scenarios, we have grouped GECOL’s generation capacity into three categories. The first is GECOL existing installed capacity. As noted previously, as of 2017 we recognize GECOL’s installed capacity as 9765MW, of which 5240MW is actually available. In the best case scenario we assume the unavailable capacity will receive the required maintenance and overhauls over the period 2018 to 2020. We consider it is available and online by the end of 2020. The second category of generation is that detailed in Table (3-7) above. These are plants that GECOL has confirmed funding is secured and they will be completed or constructed over the coming years. We have assumed each plant will be in service and supplying the Libyan network in line with the service dates shown in Table (3-7). The third category of generation relate to a detailed generation expansion plan developed in 2007 with the Korean utility and consultant, KEPCO. This plan has been updated by basically shifting the start dates for new projects forward to reasonable new completion dates, taking into consideration that none has been tendered yet nor has any funding been arranged. These new generating units are now assumed to come onto the Libyan network between 2023 and 2029. The new units and proposed service dates are detailed in Table (3- 8). We note that GECOL’s original generation expansion plan included a good balance between generation technologies, but many factors and conditions have changed in Libya and it is now critical to carry out a new full-fledged generation expansion study and develop a new comprehensive plan compatible with the new situation on the ground, the new generation and load profiles that have come into being, and the new forecasts of load growth. 43 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE In fact, the Libyan load forecast itself will need to be updated through a new detailed study in the future to reflect the changes in the country’s economic and political conditions. In this analysis we will use the load forecasts8 derived in the Task A Rapid Assessment. The estimated available capacity of the simple cycle and combined cycle gas turbine units in our analysis takes into account the difference in ambient conditions along the coast and in the southern desert regions and may be considered an average of the year round expected available power from these units. Based on the data in Tables (3-1), (3-7) and (3-8), and using the load forecast figures derived in the Task Rapid Sector Assessment, Figure (3-9) provides an overview of the expected generation situation versus forecast load. Estimated No. of Nameplate available Year in P/S Region Type units rating capacity service Tripoli East Tripoli Steam 4 4x350 MW 4x350 MW 2023-2024 Tobruk 2 Eastern Steam 2 2x350 MW 2x350 MW 2025 Derna 2 Eastern Steam 2 2x350 MW 2x350 MW 2023 Benghazi West Benghazi Steam 4 4x350 MW 4x350MW 2026-2027 Sebha Southern Gas 3 3x285 MW 3x228 MW 2022 Tripoli South 2 Tripoli Gas 3 3x285 MW 3x250 MW 2023 Misurata Central CC 3 3x250 MW 3x220 MW 2024-2025 Melita Western CC 6 6x275 MW 6x242 MW 2026-2028 Zweitina Wahat CC (steam) 1 1x275 MW 1x242 MW 2022 Tobruk Eastern CC 3 3x275 MW 3x242 MW 2028-2029 Abukamash Western CC 3 3x275 MW 3x242 MW 2028-2029 TOTALS 34 10,235 MW 9,440 MW Table (3-8): GECOL’s original generation expansion plan, updated 8 Scenario A, “Continuous political instability scenario”, is more conservative and assumes no mega-projects will be developed, while scenario B “Slow political stability scenario” assumes mega- projects to kick-in in 2022 driving a steeper increase in electricity demand. 44 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (3-9): Generation available power against load forecasts – best case Based on these assumptions, GECOL can expect to have resolved its power shortage crisis by 2019 and by 2020 there is a significant reserve in generation capacity. However, even with the four new power plants now expected to be contracted and put in service between 2019 and 2020, and taking into consideration the expected retirement of some of the existing generating units as they age, between 2024 and 2027, depending on the actual rates of growth of demand and GECOL’s ability to maintain a high rate of availability for its generation, GECOL will again begin facing a power shortage situation if the contracting of the next generation of power stations does not begin by the early 2020’s. If we consider the lead time required to tender and contract for major power plants, the complicated contracting process in Libya, and the current political and economic situation of the country, this is an important caveat and concern. At the same time we also note that the reserve margin is very large, confirming that many of the new units that have been contracted and installed outside the original generation expansion plan effectively replace units in the plan. This further emphasizes the need to renew the generation expansion plan study and bring it up to date with the new GECOL situation. 3.1.5.2 Worst case generation growth scenario In what may be called a worst case scenario, we have reduced the forecast generation capacities of GECOL as follows: 45 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Category 1 plants, existing 9765MW installed and 5240MW available: We assume GECOL will be able to carry out at most 4 overhauls per year to clear the backlog of overdue major maintenance, but will also be able to carry out the overhauls of newly due units to prevent further growth of the backlog. On this basis, the unavailable capacity will have been resolved by 2024. Category 2 plants, 10785MW under construction or to be contracted with funding secured: We have assumed the plants will not be contracted and constructed as quickly as GECOL assumes, and that they will be in service over the period from 2018 to 2023, as detailed in Table (3-9). Estimated No. of Nameplate available Year in P/S Region Type units rating capacity service Ubari Southern Gas 4 4x156 MW 4x125 MW 2018 Gulf Central Steam 39 3x350 MW 3x350 MW 2021-2023 Tripoli West Tripoli Steam 4 4x350MW 4x350 MW 2022-2023 Tripoli West Tripoli Gas 4 4x167 MW 4x145 MW 2020-2021 Tripoli East Tripoli Gas 2 2x127 MW 2x110 MW 2021 Misurata Central Gas 2 2x320MW 2x280 MW 2020-2021 Tobruk Eastern Gas 4 4x185MW 4x160MW 2020-2021 TOTALS 23 5376 MW 4950 MW Table (3-9): Under construction and to be contracted generation plants, worst case dates Category 3 plants, included in original GECOL generation expansion plan but not yet contracted nor funded: This group of new generation has been excluded from the worst case scenario. This scenario only considers new plants GECOL has confirmed will be constructed. Using the same load forecasts of the Task A Rapid sector Assessment results in a new graph of generation expectations vs load forecast, as shown in Figure (3-10). 9 Gulf Power Station has 4 steam turbine generators. However, one is already in service, so only 3 units are considered to still be under construction. 46 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (3-10): Generation available power against load forecasts – worst case In this case, GECOL is able to meet its load expectations by 2021. However, with no new generation being contracted beyond the current plans, GECOL could begin facing power shortages again as early as 2022 in the case of the highest demand growth rate. Figure (3- 10) shows that in this case the margin of available power exceeds demand by only around 500MW, which is not sufficient to provide for a spinning reserve and for units outs for maintenance. Even at the lower demand growth rate, power shortages will appear by 2026. This confirms that to fully meet expected Libya electrical power needs, GECOL must continue down a three pronged approach: 1. Resolve the maintenance backlog and fuel supply problems and get the installed capacity back to a good availability level; 2. Proceed with the construction of the confirmed power generating plants; 3. Update the load forecast and generation expansion studies and proceed with tendering and contracting for the new plants as soon as possible. 3.2 Energy balance Beginning from 2009, GECOL worked on establishing an Energy Data Management (EDM) system. It was intended support GECOL in: 1) Analysis of technical losses, calculation of the losses at each voltage level of the power network and provide a clear and exact comparison of generated and consumed power and energy. 47 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2) Compare calculated losses with historical data and determining energy losses by both voltage level and geographic area 3) Develop a consumer demand profile based on 15 minute breakdowns of the power and voltage profiles 4) System reserves calculation from the data on the supply side and consumption side 5) Real-time balance monitoring to detect deviations or unexpected events 6) Continuous power monitoring by integrating and extrapolating the power flow in the tie-lines. In addition to analysis of the load profile and peak demand, the system would allow benchmarking comparisons of current performance with historic data, extracting average daily profile for aggregate analysis, and correlation with temperature and weather conditions. GECOL’s EDM system consists physically of smart energy meters installed at all power transformers, unit and auxiliary transformers, and on tie lines. The smart meters are designed to be equipped with GSM communications to transfer data to the telemetry stations. The project included the following main stages: a. Meter installation: More than 80% of existing stations have already been equipped with the smart meters. Work is also ongoing to install meters on new plants and installations. b. Establishing central telemetry station: This work is also currently on hold. The meters have also not yet been equipped with GSM sim’s. Some new plants have included in their specifications the smart meters and equipment related to the EDM system, as was the case with Khoms fast Track units and some other new generation. However, the constant growth of the power network where such specifications have not been included in the supply and installation contracts, has made it difficult for the installation of the meters to keep up. There is therefore a significant time lag between the energizing of new transformers and other equipment and their inclusion in the energy balance scheme, so any measurements at present are approximate, incomplete and inexact. The GECOL EDM team is doing its best to follow up on new transformer installations and to equip them with meters. Much effort is also being put into the replacement of faulty meters. The current energy measurements are largely unreliable for the following reasons: - The meter readings are collected manually, and not all substations are accessible to GECOL staff due to security issues. Missing measurements are estimated based on historical readings 48 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE - There are installation errors at many of the locations, such as unmatched instruments transformers, incorrect wiring, etc. The smart meters are capable of performing installation check and giving alerts of installation problems. However, fixing these problems has been slowed down by complications in the lines of responsibility between the EDM teams and the departments responsible for the locations where the meters have been installed. - Many substations are not yet equipped with meters. At present the Customer Services General Department is responsible for the care of the EDM meters, but the meters are installed on assets belonging to the Medium Voltage, Transmission, and Generation General Departments. We recommend the relevant meters should fall under the direct responsibility of the Department in which they are located. Boundary meters between the departments should be installed on both sides of the divide. Thus, for example, the Transmission Department will measure the energy exported to the Medium Voltage Department, while simultaneously the Medium Voltage will also be measuring the energy it is receiving. This way both accuracy and accountability will be greatly enhanced, and all departments will be motivated to reduce their system losses. 49 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3.3 Points of concern The current status of GECOL’s power generation assets highlights the following main points that require attention. 3.3.1 Immediate concerns  GECOL’s most urgent priority should be resolving the back log of overdue maintenance, overhaul, and equipment replacement activities. A concentrated three year program will be needed if this backlog is to be settled by 2020.  At the same time, GECOL needs to schedule the maintenance and overhauls of other operating units that will have major maintenance works due over the coming years while the backlog is being cleared.  GECOL is also encouraged to take action to ensure availability of third party plants to supply the GECOL network, even if that might mean GECOL making initial investments in overhauling these units, where considered feasible and viable.  Fuel supply is critical to the continued and reliable operation of existing and new generation. Increasing the size of tank farms may be one factor to increase the buffer to cover periods of shortages in supply  A quick partial solution to the fuel supply problem is completion of the Entisar-Sarir gas pipeline planned to deliver natural gas to the Sarir Main Gas Power Station. At the time work was stopped because of the security situation in 2014, commissioning was about to start. If work was to resume, it can be expected that the pipeline could be in service within a period of 6 months or less.  As far as feasible, power plants should be equipped to carry out their own analysis of the quality of fuel supplied to ensure minimum disturbance of operations due to substandard deliveries.  Suitable training programs need to be provided to operations and maintenance staff of new generating units, and for some of the significant upgrades made to existing generating units.  The long lead time in contracting and executing new power plants in Libya requires GECOL to begin from now the process of specifying and tendering at least the first 2 or 3 plants on which construction needs to start in the early 2020’s to avoid a new round of power shortages.  The EDM system needs to be completed and jurisdiction for maintenance and upkeep more clearly defined. 50 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3.3.2 Longer term concerns  Closer work with the NOC will be critical over the coming decade to resolve fuel supply problems, which includes both shortages and quality of imported fuel.  GECOL should work to fill shortages in particular specialities as well as age gaps in key fields. GECOL might consider developing 1 or 2 year training programs to qualify some of its non-technical or unqualified personnel to fill these positions.  GECOL needs to carry out a new and detailed load forecast study, collecting up to date relevant information from other stakeholders and parties in Libya, including an in-depth review of Libya’s development program and its realistic impact on future load growth. In the current dynamic and quickly changing environment, this load forecast study should be re-evaluated annually.  GECOL needs to renew its generation expansion plan in light of the many changes that have occurred in both the power generation profile as well as in the demand profile. Again, because of the dynamic environment GECOL now finds itself in, this plan should be revisited every 1 to 2 years.  GECOL’s future generation expansion plans need to consider the generation technology mix, and its effect on reliability of operations and availability of power generation units, as well as keep as much as possible a reasonable balance in the geographic distribution of generation with regard to the load centers.  GECOL should review its policy on retirement of older power plants and reassess the financial viability of their continued maintenance and upkeep  GECOL has a very large base of gas turbine units which will continue to grow. It is most likely viable for GECOL to form complete teams certified by the relevant manufacturers that are capable to carry out the overhaul works of these units. 51 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3.4 Generation action plan 1. Overdue maintenance Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Plan concentrated 3 year maintenance and 01/01/2018 6 months overhauling program Resolve backlog of Carry out 7 overhauls of GT units, 3 overhauls of ST overdue maintenance 90% of suspended units units, 6 maintenance, repair and replacement 01/01/2018 3 years 700 back in service activities each year Prioritize operating units based on operating conditions, maintenance needs and importance to the grid 01/01/2018 6 months Plan maintenance of Draft a comprehensive maintenance program for running units operating units Allocate the necessary budget Execute timely maintenance for running units (expect No new build-up of 01/08/2018 2.5 years 400 up to 6 GT units per year) overdue maintenance Review GECOL's power plants retirement policy 01/01/2019 3 months Assess the financial viability of old units continued maintenance and upkeep and set retirement dates for 01/01/2019 4-6 months non-viable units Retire old units List of units to be retired Approve the list of units to be retired 01/04/2019 2 months approved Retire all very old and unviable units (i.e. ready for 01/06/2019 ongoing retirement units) Write off retired assets from GECOL's books 01/11/2019 2 months Negotiate with Libyan Steel Co. for overhaul units Ensure availability of 3rd (possibly carry out overhauls on their behalf for 2/3 01/01/2018 2 years 250 MW added to grid 75 party P/S units) 52 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2. Inadequate fuel supply Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Work with the Government to protect fuel convoys to 01/01/2018 4 years P/S especially to remote regions Work with local communities to engage in protecting 01/01/2018 4 years fuel supply lines Zero unavailable capacity due to fuel supply Assess which plants could benefit from increased fuel tanks capacity to act as a buffer for delayed or 01/06/2018 6 months unsuitable fuel deliveries Protect fuel supplies to Tender and contract additional fuel tanks 01/01/2019 2 years P/S and address fuel quality problem Work with the Government and the Gas Transport & Distribution Co. to resolve contractual issues for the 01/01/2018 1 year Supply Sarir P/S with gas 30 completion of Entisar-Sarir pipeline Full implementation of Provide key power stations with fuel analysis lab 01/07/2018 1.5 years fuel quality control 2 equipment and train staff procedures Establish a joint NOC/GECOL commission to oversee 01/01/2018 3 years and resolve supply problems to individual P/S 53 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3. Delayed capacity expansion projects Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Complete Obari power station and connect to power Obari completed 01/01/2018 6 months Complete under network ensuring fuel supplies (4x125 MW online) construction projects Gulf completed Complete Gulf Power Station 01/07/2018 1.5 years (3x350 MW online) Contract to renew 20-year load forecast study and 01/06/2018 Ongoing regularly update and extend load forecast study Update load forecast and Based on updated load forecast, contract for 20-year generation expansion generation expansion study considering also optimal Updated generation plan generation mix and regularly update and extend 01/01/2019 Ongoing 0.3 expansion plan generation expansion plans (first annually and later biannually) Tender, contract and execute first generation of new RFP for first round of new 01/01/2019 5 years plants (either autonomously or through IPPs) projects issued Tender new generation Finalize arrangements for 4 new power stations capacity (ensure funding, finalize contracts, assess local support 01/01/2018 3 years 2000 needs to secure rapid completion) Procure any remaining materials or replacement for 01/01/2018 2 months EDM system Complete installation of EDM meters and telemetry Complete EDM system station to ensure new network installation are 01/03/2018 8 months correctly metered Define departments responsibilities for maintenance 01/11/2018 2 months Fully functioning EDM and servicing and for reporting of operating results 54 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4. Skills shortage Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Introduce additional local or abroad training for all 01/01/2018 1.5 years 1 new power stations and generating units Agree with gas turbine OEMs of major fleets on Certification program for Solve lack of O&M establishing dedicated training facilities to provide a 01/01/2019 4 years P/S O&M personnel in 5 competences certified world class training program for P/S place maintenance engineers and technicians Include training in scope of overhaul service providers 01/01/2018 3 years and set up development programs at each related P/S Map shortages in generation department staffing 01/01/2018 6 months Determine skills and specialization requirements to 01/07/2018 6 months Solve Generation BU fulfil identified opened positions understaffing Develop multi-year training programs to qualify non- All P/S operation shifts technical or unqualified personnel to fulfil workforce 01/01/2019 6 years adequately staffed with 7 needs in generation and other departments qualified personnel 55 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4 Transmission 4.1 Current status Since the first 220kV substations and overhead lines were introduced, Libya has followed a very ambitious development and expansion of its transmission network. Top tier international consultants have helped GECOL design the transmission system, from Kennedy and Dunkin in the early 1970’s to Parsons Brinckerhoff in the late 2000’s, with other consultants such as Hydro Quebec International and CESI along the way. Stringent criteria were determined and agreed between GECOL and the consultants to ensure the reliability and robustness of the transmission system. This included an n-1 criteria defined to cover the loss of both circuits on a double circuit transmission line or the loss of all generation connected to a single busbar. GECOL standardized the design of the 220kV overhead lines such that all are double circuit lines with towers capable of surviving some of the most severe environmental conditions and events. Transmission substations are from reputable world-class manufacturers such as Siemens, ABB and GE (previously Alstom). GECOL management also had a strong vision for the development and growth of the transmission system. Planning was not just based on the requirements to serve the load needs of the Libyan network, but also considered possible future wheeling of power between Egypt and Tunisia through the Libyan network, as well as wheeling and supply of power to Italy. For these and other reasons, GECOL pushed strongly to introduce a 400kV backbone, thereby further reinforcing the existing 220kV transmission network. There have been criticisms that GECOL has over invested in its transmission system. Experience has proven that GECOL has actually applied very high standards in the design and execution of its transmission network and ensured an excellent level of redundancy. We can confidently say that it is mainly because of this redundancy that the GECOL power network has been able to survive and quickly recover from the loss of transmission lines, substations, and other key network elements that have been damaged by successive bouts of fighting and vandalism across many parts of Libya during the events of the past few years. An extreme example of the resilience of the Libyan network can be seen in the city of Benghazi. Buatni is a main 220kV substation infeeding to the Benghazi subtransmission (Medium Voltage 30kV) network. It is also a major node in the transmission grid with several 220kV transmission lines connected to it. During the 2014-2017 fighting in Benghazi, the substation was completely destroyed and several of the transmission lines damaged. 56 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Despite this, GECOL has been able to maintain supply to meet the load demands of Benghazi through the remaining 220kV infeed points to the city, Libya’s second largest. Despite this resilience, the transmission network, like other business units in GECOL, is suffering from the reduced budgets, from difficult and at times dangerous work conditions, from scarcities in spare parts and equipment required to maintain key elements of the transmission system, and from delays in completing planned additions to the infrastructure such as new substations, overhead lines and cables. 4.2 Transmission substations GECOL currently has in service 13 400kV substations and 86 220kV substations, with many more new substations at various stages of progress under several contracts. Of these substations, GECOL has five 220kV substations and one 400kV substation out of service, representing 5.8% and 7.7% respectively. These are listed in table (4-1). No. Substation Voltage Reasons 1 Sirt 220kV Damage to busbar from stray gunfire 2 Zamzam 220kV Information not obtained 3 Bir 220kV Vandalism, compounded by insecurity in the area Ghanam 4 Buatni 220kV Destroyed during armed conflict 5 Hira 220kV Vandalism and theft of cabling left the protection out of service, subsequently a fire destroyed the 30kV switchgear and part of the 220kV switchgear 6 Sidi Faraj 400kV Oil is required for the power transformers (400/220kV and 220/30kV) Table (4-1): List of transmission substations out of service It will be noted from the table that almost all major loss of substation assets has been due to the insecurity situation in Libya. Replacement of a transmission substation is a major and expensive undertaking, second only to replacement of a power generating unit or plant. Therefore putting these substations back into service will take time. However, the redundancies built into the Libyan transmission system have allowed GECOL to overcome these losses and maintain supply to all regions. Damage or loss of complete substations is only a small part of the problems faced by GECOL. More common and just as important is the loss of other key components of substations. The first element of substations to consider is the switchgear. The majority of transmission switchgear in GECOL’s system are SF6 gas insulated switchgear (GIS). These are very reliable and subject to limited environmental effects. Aside from overhauls every decade or so, they have little maintenance requirements. 57 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE No. Substation Switchgear kV S/S type Remarks 1 Zliten Hakmoun 220KV BBC Switchgear to be replaced. There is sufficient space for a new building. 2 Agelat 220KV BBC Switchgear to be replaced. There is sufficient space for a new building. 3 Jmail 220KV BBC Switchgear to be replaced. There is sufficient space for a new building. 4 Tarhouna 220KV BBC Switchgear to be replaced. There is sufficient space for a new building. 5 Gharyan 220KV BBC Switchgear to be replaced. There is sufficient space for a new building. 6 Tripoli East 220KV BBC Switchgear to be replaced. There is sufficient space for a new building. 7 Sirt 66KV ENERGOINVEST Switchgear to be replaced. There is sufficient space for a new building. 8 Ruweis 66KV ENERGOINVEST Switchgear to be replaced. There is sufficient space for a new building. 9 Shakshuk 66KV ENERGOINVEST Switchgear to be replaced. There is sufficient space for a new building. 10 Gharyan 66KV ENERGOINVEST Space has been allocated to erect a new building 11 Tarhouna 66KV ENERGOINVEST New switchgear has been installed and is pending commissioning 12 Zamzam 66KV ENERGOINVEST Switchgear to be replaced. There is sufficient space for a new building. 13 Abunjaim 66KV ENERGOINVEST Switchgear to be replaced. There is sufficient space for a new building. 14 Sirt 30KV ENERGOINVEST New building has been erected. Pending supply or allocation and installation of new switchgear 15 Zamzam 30KV ENERGOINVEST Switchgear to be replaced. There is sufficient space for a new building. 16 Khoms Switching 30KV ENERGOINVEST Work has started on erection of a new switchgear building. Works is currently stopped. 17 Garabulli 30KV ENERGOINVEST Work has started on erection of a new switchgear building. Works is currently stopped. 18 Khoms Generation 30KV SIEMENS Switchgear to be replaced. There is sufficient space for a new building. 19 Tripoli West 30KV MEDELIC New building has been erected. Pending supply or allocation and installation of new switchgear 20 Gharyan 30KV BBC Switchgear to be replaced. There is sufficient space for a new building. 21 Tarhouna 30KV BBC Switchgear to be replaced. There is sufficient space for a new building. 22 Misurata Gas 30KV WESTINGHOUSE Switchgear to be replaced. There is sufficient space for a new building. 23 Tripoli East 30KV SIEMENS New switchgear has been completed. Pending cable and termination works 24 Abukamash 30KV SIEMENS New switchgear has been completed. Pending cable and termination works 25 Souk Jumaa 30KV SIEMENS Switchgear to be replaced. There is sufficient space for a new building. Table (4-2): Transmission substations targeted for renewal or replacement However, GECOL also has a number of old substations whose switchgear dates back to the 1970’s and 1980’s. These include airblast circuit breakers whose spare parts are no longer 58 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE easily available, and which have at times had to be produced locally at a lower quality and lifetime, sometimes lasting only a few months before having to be replaced. GECOL has set up a plan to replace the equipment in these substations, but the replacement work has come to a standstill over the past years. These stations are listed in Table (4-2). A major part of any substation is its transformers. GECOL’s transmission substations generally have 2 or 3 transformers. Transformer ratings from the 220kV down to 66kV and 30kV have previously been 63MVA, but GECOL is moving towards a new standard of 100MVA. In total GECOL’s transmission substation have 216 power transformers with ratios of 220/66kV, 220/30kV, and 132/66kV with a combined power capacity of 16,280MW. In aggregate and on average, this more than covers the n-1 network design criteria, although in practice some substations are more intensely loaded than others. The total number of 400/220kV transformers is 28 with an aggregated power rating of 11,200MW, which again comfortably exceeds the current 7000MW peak network load. No. Substation Transformer rating Reasons 1 Agelat 220/30kV 35.5MVA Transformer damaged, reasons not known 2 Bir Ghanam 220/30kV 100MVA Transformer hit by shrapnel and gunfire 3 Zawia 400/220kV Transformer completely burned, due to 400MVA lightning 4 Sebha km18 220/66kV 63MVA Transformer out of service for a long time, reasons not known 5 Sirt 220/66kV 63MVA Transformer out of service for a long time, reasons not known 6 Misurata 220/30kV 100MVA Transformer damaged during fighting in 2011 Central 7 Sirt Gulf 400/220kV Transformer completely burned, due to 400MVA lightning 8 Shati 220/66kV 63MVA Transformer completely burned, reasons not known. (A new 125MVA transformer has now been installed) 9 Traghen 220/66kV 63MVA Transformer completely burned, reasons not known. (A new 125MVA transformer has now been installed) Table (4-3): List of transmission substation transformers out of service In GECOL’s network, nine substations have a damaged power transformer, as listed i n Table (4-3). However, this only represents the tip of the iceberg, as these are only the damaged transformers that have not yet been replaced. GECOL has faced many other transformer failures, where the transformer has been replaced. In fact, the incidence of power transformer failures has been historically high enough for GECOL to invest in a complete transformer workshop capable of rehabilitating some of the largest transformers in the network. GECOL has also made several attempts in the past to 59 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE contract out the operation of the workshop, but has had very limited success. The workshop is not being utilized at present. This high level of transformer failures is a major concern. Only two of the transformers have been damaged due to armed clashes. The remaining transformers all appear to have been affected by either internal defects or external network events. Both reasons should be unacceptable to GECOL and the matter requires serious investigation to determine the true causes and the actions required to mitigate them. Power transformers at the 400kV and 220kV level are an expensive item of plant that is not easily or quickly replaced or restored, nor can GECOL maintain a large stockpile of spare transformers of this category. Special attention must be drawn in particular to the number of transformers that appear to have been damaged by lightning. Transformers have several layers of protection to reduce the possible voltage surges incurred by lightning strikes, from overhead line earthwires to arcing horns across insulators to surge arrestors nearest to the transformers. Why have these not been able to protect the transformers? GECOL has to determine if the problem is one of design or poor implementation or human interference in the equipment, making it ineffective. GECOL has teams specialized in transformer maintenance. Oil treatment machines are available in all maintenance departments. In fact, most oil treatment capability is concentrated in the Transmission maintenance units, and they are often requested by other business units, such as generation, to carry out maintenance and treatment for their transformers. However, GECOL does not have sufficient preventive maintenance capability, such as dissolved gas analysis (DGA) instruments, to oversee and follow up the number of transformers in the network, such that these tests are rarely carried out. It would also be advisable for GECOL to set up at least two central oil analysis laboratories which can carry out full analyses of transformer (and other) oils. This will be very important to GECOL in both preventing equipment failures and analysing failures post mortem. Another important component in 220kV substations supplying the 30kV networks is the neutral point earthing resistor. Neutral earthing resistors are used to limit the short circuit current resulting from earthfaults. GECOL’s standards and specifications for the 30kV network were designed with the assumption that the system is resistively grounded. However, this is not understood by operations and maintenance staff working on the transmission network, and many resistors in transmission substation will be found that have been bypassed. The result is that high earthfault currents increase the risk of damage and loss of additional network components, such as cables affected by high sheath currents during these faults. Table (4-4) lists the 15 substations where the neutral earthing resistors have been confirmed to be out of service. It will be noted from the table that many of the transformers 60 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE missing their neutral earthing resistors serve major urban load centers, which increases the consequences of the follow-on loss of other network components such as 30kV cables. The next critical component of substations is the DC supply systems, and in particular the battery sets. GECOL’s transmission substations use alkaline Nickel Cadmium batteries. 110V systems supply the substation control and protection, while 48V systems supply the telecommunications equipment and the RTU’s connecting to the Regional Control Centers . No. Substation No. of No. of earthing resistors out of transformers service 1 Harsha 2 2 2 University 1 1 3 Agelat 3 3 4 Abu Kamash 2 2 5 Bir Ghanam 2 2 6 Hira 2 2 7 Ain Zara 3 3 8 Tripoli South 3 3 9 Sidi Hamed 3 3 10 Khoms Switching 3 3 11 Garabulli 2 2 12 Tumaina 3 3 13 Misurata East 2 2 14 Kaam 3 3 15 Zliten 3 3 TOTAL 37 Table (4-4): List of neutral point earthing resistors out of service Battery maintenance is considered a low stature job, and therefore few engineers in the Transmission Departments are willing to specialize in it. As a result, GECOL has not built up the experience and know to best maintain its DC supply systems and to keep its battery sets in optimal working condition. We find at almost all levels of GECOL that battery sets have shortened lifetimes and are frequently replaced. Normally, nickel cadmium batteries can have lifetimes of up to 20 years. In the transmission substations batteries sets are often replaced after some 5 years of operation. There also seems to be little, if any, effort at rehabilitation of the battery cells before they are replaced. When replaced batteries are likely not to go through a complete commissioning cycle and be properly charged up, nor are the charge settings of the battery chargers correctly adjusted to the specific characteristics of the new battery sets. Correct and safe operation of the transmission network is contingent on reliable DC supplies in substations. Without these, protection will not be able to isolate faults, the control centers will not be able to open and close the switchgear, network status and 61 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE measurements will not be available to the Control Center Operators, and even local operations staff will not be able to operate the switchgear except through its local mechanical control. In fact, in the case of solenoid operated switchgear, even mechanical operation may be impossible without a DC supply. It is therefore imperative that GECOL develop its capabilities in the area of battery and DC system maintenance. This should be a key training target, and staff need to be encouraged to specialize in the field of work. We note that in most fields of activity, the Transmission General Department has built up teams of highly qualified engineers and technicians, capable of dealing with normal as well as abnormal and emergency situations and events. GECOL has the internal skills to repair, replace, refurbish and overhaul most of the components of the transmission networks. These skills need to be maintained, continually developed, keep up with technological advances, and passed on to new generations. The last point in particular could be enhanced if GECOL implemented some kind of apprenticeship system, coupling new staff with experienced older personnel tasked and assessed on training and developing the skill sets of the younger engineers and technicians. Keeping up with technological advances in transmission system equipment is another challenge to GECOL. GECOL substations have begun to migrate to Digital Control Systems (DCS). All new substations are equipped with DCS, and GECOL has plans to upgrade old substations to DCS control. These are quickly becoming the main interface substation operators have with their substation switchgear and other equipment, replacing mimic boards and control panels. DCS is also replacing RTU’s (Remote Terminal Units) for interfacing substations with the control centers. Over 20 transmission substations are currently equipped with DCS. Maintenance engineers that have been interviewed for this study have all indicated that they do not possess sufficient knowledge on how to maintain and repair DCS systems. Discussions with the Control Center staff also point to similar problems; one of the important reasons given for substation data not being received at the Control Center was problems with the DCS systems and limited ability to solve the problems. DCS systems are therefore an additional area where GECOL training programs for transmission staff should focus. GECL has a limited number of different DCS systems installed, dependent on the switchgear manufacturer and the generation. Suitably qualified teams should be developed in each of the relevant Maintenance Departments specialising in each type of DCS. 62 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4.3 Overhead transmission lines GECOL has over 200 overhead line circuits in the transmission system, totalling 2290km of 400kV overhead line circuits and 14458km of 220kV overhead line circuits, with several new 400kV and 220kV transmission lines still under construction. Part of the 220kV system, in the southern Sarir-Kufra-Tazerbo region, is actually operated at 132kV. The long lines and light loads at this terminus of the transmission system result in overvoltage problems. The local transmission network was therefore designed to be operated at 132kV but the equipment designed for 220kV. At some future date when load levels warrant it, the operating voltage can be raised to 220kV with relatively minor modifications to the overhead lines and at the substations. Of this large transmission network, there are currently 10 overhead lines that are completely out of service (Table 4-5). Almost all the lines are in the Eastern region, mostly around the city of Benghazi, and out of service due to damage from armed conflict. It was the security situation that had prevented work on the overhead lines up to the present, although action is now being taken to repair these lines. Of course, in several instances the substations to which the lines are connected have also been damaged or destroyed, and utilization of the lines will be dependent on repair/replacement of the substations or reconfiguration of the overhead lines to bypass these substations. From the Table (1) we see that the total length of overhead transmission out of service is 819km at the 220kV level, representing 5.7% of the installed base, and 23km at the 400kV level, or 1%. No. Overhead line Voltage Length level 1 Benghazi North New – Buatni (circuits 1 & 220 kV 11.69km 2) 2 Buatni – Sidi Faraj (circuits 1 & 2) 220 kV 9.72km 3 Sidi Faraj – Gwarsha (circuits 1 & 2) 220 kV 17.03km 4 Benghazi South – Agedabia (circuit 1) 220 kV 133.87km 5 Agedabia – Brega (circuits 1 & 2) 220 kV 94.61km 6 Misurata Steel – Tumaina (circuits 3 & 4) 220 kV 19.2km 7 Buatni – Agedabia (circuit 1) 220 kV 144.47km 8 Brega – Ras Lanouf (circuit 1) 220 kV 157.8km 9 Ras Lanouf – Sirt (circuit 1) 220 kV 228.5km 10 Sidi Faraj – Benghazi North New (circuits 1 400 kV 22.7km & 2) TOTAL 220kV 818.89km TOTAL 400kV 22.7km Table (4-5): List of transmission lines out of service 63 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Over the past seven years there has been a much higher level of outage of transmission lines, most due to damage by munitions, others by vandalism and theft of lattice tower sections leading to failure of the complete towers. GECOL has in each case made concerted efforts to repair and put these lines back in service, using up its stock of overhead line spares and even of the tower material imported for new projects. The work has been done both by GECOL overhead line staff and by local contracting companies. In addition to existing line outage, GECOL also faces the problem of new transmission line projects that have not been completed. The construction of a large part of the new 400kV transmission backbone has not been completed despite progress having reached 80% and 90% on several lines. The most critical at the present moment are the lines of the east-west interconnection. At present the stability limit of the 220kV link is 530MW, which limits the amount of power that can be transferred between the eastern and western Libyan power networks. This is becoming critical with the power shortages faced by the western network and the excess capacity available in the east. This problem will be further amplified with the new generation projects expected to be implemented in the eastern network over the coming 2 to 3 years, maintenance of existing units and resolution of fuel supply problems, all of which will increase the excess capacity in the east capable of supplying power to the west. This and other transmission line projects that have stopped will play an important role in further improving the transmission system and reducing bottlenecks, and need to be given priority to resume construction works. Since the early 1990’s GECOL has established its own overhead line maintenance teams. Prior to that, all transmission overhead line works were outsourced to international contracting companies. The GECOL overhead line teams gained experience in all types of line maintenance and repair. Larger jobs were still outsourced to contractors, but much of the overhead line work was carried internally by GECOL’s teams. From the start, a main focus of GECOL’s overhead line teams has been cleaning of line insulator strings. Before GECOL’s team took over, line cleaning was also contracted out to international contractors, but on a regular, periodic, or scheduled basis. Once GECOL had its own overhead line maintenance teams, periodic cleaning of all overhead line became a standard part of GECOL’s annual maintenance programs. Initially, the aim was to clean each line once a year, focus on the summer period leading up to the summer peak. Within a few years, cleaning plans included key lines being cleaned twice a year. Overhead line teams are still an important part of GECOL’s cadre, but since 2011 have faced significant impediments in carrying out their works. Security is of course a key concern since much of the overhead line infrastructure is in open ground far from urban or, very often, any inhabited areas. Another important element is the aging of GECOL’s linesmen. The original overhead line technicians, now with GECOL for a quarter of a century, are no longer 64 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE physically capable to do the demanding work of overhead line maintenance. The only other of generation of linesmen employed by GECOL have been doing the work for over a decade are also getting old and less able to meet the demands of the job. For these reasons, GECOL has not been able to keep up with the overhead line cleaning required to keep its transmission lines in good working condition and maintain reliable operations of the power network. Polluted insulator strings are subject to flashovers during periods of high humidity, in addition to increasing system losses and electromagnetic noise that can cause interference with communications systems. Sources of pollution include saline deposits from the Mediterranean Sea and dust from rock quarries, which are found near the routes of transmission lines in many parts of Libya. Originally, line cleaning used a brute force methodology. The linesmen would climb the towers to the isolator strings and manually wipe the insulator discs clean, one by one. It took many days to several weeks to clean each double circuit line. Throughout the work, both circuits on the tower had to be switched off to ensure the safety of the linesmen. GECOL has now moved to less labor intensive methodologies in more recent years. Lines are now mostly cleaned using water tankers equipped with pumps and water hoses. The tankers can be moved along the line routes, from tower to tower. The pumps are powerful enough to shoot a jet of water to the heights of the 220kV and 400kV insulator strings. Linesmen carry the hoses part way up the towers to better direct the water stream at the insulators. While this method has been successful at cleaning overhead lines, it is dependent on the Transmission Maintenance Departments having sufficient water tankers, self propelled or pulled by other vehicles, equipped with the suitable water pumps and lengths of hosepipe, to clean the dozens of transmission lines in the Libya power network along the Mediterranean coast. Unfortunately, GECOL does not have the numbers of equipment it needs. Despite these impediments, in the second quarter of 2017 GECOL’s overhead line teams have managed to clean some 15 overhead lines in line with routine maintenance schedules, as well some 5 unplanned overhead lines. They also carried out a large number of repairs and replacement works on overhead lines. However, several lines could not be cleaned because of difficulties in arranging shutdowns of the overhead lines. The lines most critical to the power network, and which should receive the best attention and care by the maintenance teams, are exactly the lines that it is most difficult to switch off. For this reason it could be worthwhile for GECOL to look again at the possibility of training its overhead lines teams on live line cleaning and maintenance works, and to provide them with the equipment and tools necessary. GECOL has made several efforts in the past to develop a live line cleaning capability, but they have failed for 65 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE various reasons. The last effort was in 2010, but came to an abrupt halt with the 17 February 2011 uprising. Live line work requires a great deal of discipline and well regulated maintenance routines, and ensuring that the proper equipment is maintained and on hand to ensure the safety of the maintenance personnel and security of the power network. GECOL would therefore have to ensure that its funding and procurement arrangements are streamlined if the effort to develop live line teams is to succeed. 4.4 Underground transmission cables GECOL has a growing network of 220kV underground cables. From the mid 1990’s GECOL began introducing 220kV underground cables to connect to new 220kV substations located in the heart of its major urban areas in Tripoli, Benghazi and Misurata. The oldest of these cables has now been in service for about 20 years. The equipment and materials specifications of these cable systems, like the rest of GECOL’s transmission network, have been to the highest international standards and norms. Laying and jointing of the power cables has been to the exacting requirements and under the supervision of the manufacturers. The result is that GECOL has not had 220kV cable breakdowns. The cable system is working and extremely reliable. As with all new equipment, GECOL developed and trained maintenance teams on the jointing and termination of 220kV cables. However, with no cable faults on which to maintain and hone their skills, the technical staff have lost their ability to repair 220kV cables. Where any work is required on 220kV cables, GECOL finds itself dependent upon the assistance and support of outside specialists. 66 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4.5 Points of concern 4.5.1 Immediate concerns  There are a number of 200kV and 400kV transmission lines and substation out of service for various reasons, mostly due to security and conflict situations. GECOL needs to take the necessary action to repair or replace the relevant equipment and put these assets back in service, improving overall grid performance as well as supply to the locations served by the lines and substations.  There have been significant delays in GECOL’s substation rehabilitation projects. The old transmission switchgear still in service in the GECOL network is a financial burden because of the amounts of maintenance and replacement of parts required, and hazard to the reliable operation of the power network because of the increased rate of failures and outages they cause. The oldest airblast switchgear is in urgent need of replacement, and the newer GIS installations need either major overhauls and renewals or replacement.  Ungrounded 30kV networks are particularly dangerous to 30kV cables in that network. GECOL should take urgent action to determine where this problem exists and where possible put the resistors back in service or else replace the defective resistors or install new resistors here none existed before.  The backbone of GECOL’s transmission system is its overhead lines. The transmission network has been designed to a high standard and level of reliability. To maintain the reliability if the system, the overhead lines must be kept in best service condition, despite their exposure to multiple sources of pollution. Overhead line cleaning requires investment by GECOL, through supply of the equipment the Transmission maintenance departments need to cover GECOL vast transmission network, through development of new generations of transmission linesmen, and possibly through a stable policy of outsourcing that will encourage the private sector in Libya to develop the necessary capabilities and skills.  Transmission line and substation projects underway need to be completed and put in service. 4.5.2 Longer term concerns  The relatively high incidence of transformer faults, and especially faults due to network conditions, including lightning, or for which no definite cause has been determined, is of great concern. GECOL needs to seriously investigate all 400kV and 220kv transformer faults and verify the reason for the transformer failures. External specialists should be brought in to assist in this complex and critical analysis. Action can then be taken to prevent similar failures from happening in the future. 67 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE  Well maintained battery systems are a central element for the reliable operation of all transmission substations. One of GECOL’s highest priorities must be to develop the advanced skill sets of the maintenance personnel to maintain the batteries at their optimal performance level and to rehabilitate battery cells when necessary.  In general, GECOL transmission maintenance personnel are highly qualified and capable. There are however certain key areas in which GECOL can improve its maintenance capacities. These include o Understanding of the earthing requirements of the power networks at all levels, and also of the designs and criteria of for earthing of HV equipment and systems o In the field of DC supply systems and in particular battery systems; o In dealing with and maintaining the new DCS systems o Maintaining the skills and capabilities for jointing and terminating 220kV cables, and of newer 400kV cables, possibly by secondment of cables maintenance personnel to work with contractors laying new cable systems o Develop a live line maintenance capability for 400kV and 220kV overhead lines 68 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4.6 Transmission action plan 1. Damaged substations and overhead lines Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Assess the conditions/ requirements of each of the out 01/01/2018 2 months of service substations Set a prioritized repair, rehabilitation or replacement 01/03/2018 1 month Repair out of service program for out of service substations substations Procure materials not available in GECOL stock 01/04/2018 6-9 months All substations back in Repair/replace and reconnect to power network 01/01/2019 1.5 year service Assess the conditions/ requirements of each of the out 01/01/2018 2 months of service overhead 220kV and 400kV lines Set a prioritized repair, rehabilitation or replacement 01/03/2018 1 months Repair damaged overhead program for out of service overhead lines lines Procure materials not available in GECOL stock 01/04/2018 4 months Repair overhead lines and reconnect to power All transmission lines in 01/03/2018 9 months network service 69 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2. Delayed substation rehabilitation programs Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Resume replacement program of 6 air blast 220Kv 01/03/2018 3.5 years Commission all stations substations Arrange necessary shutdowns with control centre 01/03/2018 3.5 years Arrange overhaul schedule for overdue 220kV SF6 01/01/2018 1 month substations Procure required materials 01/02/2018 6 months Rehabilitate/ replace old assets Overhaul all 220kV Carry out overhauls 01/08/2018 1.5 years substations Arrange overhaul schedule for old 220kV overhead 01/06/2018 1 month lines Procure required materials 01/07/2018 6 months Execute overhauls/outsource works (as needed) 01/04/2019 3.5 years 70 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3. Transformer failures and 30kV network earthing Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Assess urgency and priority according to use of 30kV 01/01/2018 2 months cables in the supplied 30kV network Determine state of neutral earthing resistors 01/01/2018 2 months Reconnect 30kV neutral Procure new resistors as necessary 01/03/2018 8 months 1.5 earthing resistors Install and connect new resistors 01/05/2018 18 months All resistors connected Educate and train operations and maintenance staff 01/07/2018 6 months on importance of neutral earthing resistors Dedicate a highly competent technical team to Systematic analysis of all Investigate transformers determine the true causes of transformers failures and 01/03/2018 9 months future failures of grid 0.2 failures to decide action required to mitigate them components instituted Ensure that all transformer maintenance teams are adequately equipped with necessary oil treatment machines and dissolved gas analysis (DGA) 01/03/2018 6 months instruments to oversee and follow up the number of Improve transformer transformers in the network preventive maintenance Set up at least two central oil analysis laboratories Oil analysis laboratories which can carry out full analyses of transformers (and 01/03/2018 9 months fully operational other) oils 71 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4. Improve maintenance of overhead lines and substations DC systems Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Schedule a comprehensive transmission lines cleaning 01/01/2018 3 months program Equip overhead lines maintenance teams with Improve lines 01/04/2018 6 months necessary tools for lines cleaning 4 maintenance All 220 and 400kV lines Execute cleaning program 01/03/2018 1 year regularly inspected and maintained Prepare an updated procedure for maintenance and 01/06/2018 2 months operation of substation DC supply system Establish regional task forces dedicated to inspecting Improve substation DC and maintain existing battery systems and recommend 01/06/2018 2 months systems maintenance actions Train staff on DC systems maintenance procedures All DC systems inspected and incentivize specialization in battery and dc 01/06/2018 6 months and maintained maintenance 72 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5. Skills shortage Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Institute comprehensive skills development program 01/07/2018 1 year 1.5 for O&M personnel Improve O&M staff Arrange intensive training for new equipment and 01/07/2018 6 months 0.2 knowledge and technologies, especially DCS competencies Set up program to maintain and refresh cable jointing skills through secondment of cable jointists with 01/01/2019 2 years contracting companies As part of internal training and development program Train new generation of to fill skills and specialization gaps, train a new 01/01/2019 2 years Certified new linesman overhead linesmen generation of linesmen Contract with suitable consultant to develop skills and Develop capabilities for knowledge in live line work and procure required tools 01/01/2020 2 years 4 live line maintenance and equipment 73 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5 Control 5.1 Current status 5.1.1 Overview If we were to liken the Transmission system to a skeleton holding up the body and keeping it together, Generation to the muscles powering the body and enabling it to do work, and Medium Voltage and Distribution to the blood vessels and capillaries delivering nutrition and energy to all parts of the body, then without doubt Control is the brain and Telecommunications the nervous system keeping all parts coordinated and working in unison. And as the brain takes more than its fair share of the body’s blood supply to keep working optimally, so does the power network’s control and telecommunications infrastructure need significant investment to ensure optimal operation and stability of the power system. GECOL’s control infrastructure is divided into several levels. At the apex is the National Control Center (NCC), providing oversight, coordination, and control of the generation plants, the backbone 400kV transmission network, and 220kV interconnection substations to Tunisia and Egypt. The country is then divided west and east between the Tripoli Regional Control Center (TRCC) and the Benghazi Regional Control Center (BRCC), each responsible for control and operations of their respective 220kV transmission networks. Further downstream are Distribution Control Centers responsible for the 66kV, 30kV and 11kV networks. While the NCC, TRCC and BRCC fall under the authority of the General Control Department, the Distribution Control Centers are under the General Distribution Department and/or the Medium Voltage General Department. These control centers are connected to the power stations and substations they control through an extensive fiber optic system comprising both underground cables and OPGW transmission tower earthwires, some legacy power carrier links, and microwave links. Since the 1990’s GECOL has upgraded the earthwires on almost all its existing transmission lines to OPGW (optical power ground wire) conductors that include an embedded fiber optic cable. The specifications of all new transmission lines require the earthwires to be OPGW. In parallel, a legacy power line carrier (PLC) system on many transmission lines provides a backup communications link, albeit slower and of lower capacity and quality than the fiber optic links. Over the past five years, successive damages to transmission lines, mostly due to armed conflicts, has led to loss of one communications link after the other and a sever degradation in both the fiber optic-based data and voice communications links between the control centers and the network substations and power stations. 74 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5.1.2 National Control Center (NCC) The need for a National Control Center (NCC) was recognized soon after Libya’s Western and Eastern power networks were interconnected, on December 24, 1992, to oversee and coordinate the operations of the unified power network. Initially, the NCC function was a part of the Tripoli 220kV Control Center (subsequently to become the Tripoli Regional Control Center, TRCC). It comprised a separate control engineer in the control room responsible for NCC activities, and all control functions remained the prevue of the regional control centers in Tripoli and Benghazi. In 2005 the NCC became a separate and independent administrative unit, although still working within the physical confines of the TRCC. In 2007 GECOL established a new fully functioning National Control Center based in the city of Sirt, and a backup NCC in Tripoli. The fighting in 2011 put the Sirt National Control Center out of service, and since then GECOL’s NCC has been operating solely from Tripoli. While the loss of Sirt National Control Center has meant there is no longer a formal emergency backup center for the NCC, the security situation on the ground has forced GECOL to arrange an ad hoc backup system located at some transmission substations in the Tripoli area. These are still dependent on the main computer systems physically located at the NCC/TRCC building, the control engineers and their workstations can access the system via the fiber optic links from several different substations. Thus when the Swani Road area may become unsafe or staff are otherwise prevented from accessing the control center building, NCC staff can continue to monitor and control the network from these back up locations. This situation occurred in 2014 and several times afterwards. The NCC and TRCC are built around Alstom’s (now part of GE Grid) e-terrahabitat SCADA software system. The NCC also has additional software modules for EMS (energy management system), economic dispatch, AGC (automatic generation control), and resource scheduling. As the installed system is now some 10 years old, efforts have been made to arrange an upgrade, but have been stalled by the difficulties in opening documentary credits to the suppliers, and further compounded by the current instability and insecurity in Libya. Telecommunications with the controlled stations is actually carried out by the TRCC and BRCC computer systems. The NCC receives its data from the TRCC/BRCC computers. Some 95% of the controlled stations’ data has been modelled in the NCC/TRCC databases, and all relevant stations have been linked to the NCC. However, problems with the communications links, some of the RTUs (remote terminal units) in the stations, etc, make only 20% of the system actually visible to the NCC (and TRCC) computer system (Figures 5-1 and 5-2), compared with 98% in 2011. Fortunately, to date that 20% of data covers key network points that provide a sufficient view of the network status to the control engineers. Some of 75 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE the missing data is further covered by the SCADA software’s state estimator function, and other data is manually entered to give a reasonably clear network overview. Figure (5-1): Data availability at NCC/TRCC and causes behind unavailable data Figure (5-2): Quality of data at NCC/TRCC As a result, the NCC is fully dependent on operators at almost all stations and on voice communication links with those operators in order to actually control the power network. The NCC control engineers are dependent on the updates they get from the station operators to complete their picture on the true status of the power network, and can only dispatch generation and respond to network requirements through the instructions they give these operators. Despite on-site contractual activities having come to a halt in 2011 and again in 2014, the supplier continues to monitor and provide remote support to the SCADA system through a 76 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE secure VPN internet connection, controlled by GECOL’s engineers and only opened for the limited periods agreed between the two sides. From a power network viewpoint, the NCC is responsible for dispatching all generation plants and units in the Libyan network. It also responsible for control and operations at all 400kV substations and main 220kV transmission lines that directly impact and control the power flow through the transmission grid. The lines and substations in this latter category are not fixed and change according to network configuration. For example, outage of a 400kV transmission line could make the parallel 220kV transmission lines critical to the network power flow and put them under the control of the NCC, while putting the 400kV line back in service will return the 220kV lines to the control of the TRCC or BRCC. Where in doubt, the TRCC and BRCC control engineers will consult with the NCC before taking action on 220kV elements that might have network-wide implications. In time of power shortage, it is the NCC that determines the amount of power that needs to be shed, and the RCC’s (and sometimes the DCC’s as well) that carry out the actual disconnection of loads. As part of GECOL’s public relations, transparency, and communications efforts, GECOL updates its official Facebook page with daily estimates of the hours of power outage expected. This information is provided to GECOL’s PR department by the NCC manager. GECOL now has a project to maintain and upgrade the NCC SCADA system. The contract is in progress, although the work is on hold because of the security situation and payment difficulties. At a later stage GECOL will also erect a new back up NCC in another city outside Tripoli, and consider the Tripoli NCC the main. The final configuration for the Control hierarchy is shown in Figure (5-3). Figure (5-3): Upgraded configuration of GECOL network control hierarchy 77 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5.1.3 Tripoli Regional Control Center (TRCC) Tripoli has had a generation/transmission dispatch control center since the introduction of the 220kV network in the 1970’s. The current control center was contracted with the NCC project with Alstom Grid (now part of GE Grid) and put in service in 2007. 90% of the TRCC’s substations have been connected to the new control center, and 95% of stations have been modelled in the SCADA database. However, as with the NCC, at present the TRCC has actual access to only 20% of the system due to problems with the communications links, RTUs, etc. This compares with 90% data available in 2011. To help resolve some of the connection problems, those due to RTU problems or incompatibilities, GECOL plans to replace 20 RTUs with Digital Control Systems (DCS) in the substations. The project is still in the tendering phase. GECOL has also contracted to carry out maintenance and upgrade of the TRCC SCADA system, similar to the work on the NCC. The contract is awaiting the opening of a letter of credit. In installing a modern, comprehensive and advanced SCADA system such as Alstom’s/GE’s e- terrahabitat complete with EMS (energy management system) and other facilities and tools, GECOL has paid a premium for an all-encompassing solution. The Alstom/GE system is capable of providing a Total System Cost figure, a measure of the quality of the data being received. This is determined by the various mismatches in the data being received and between the received and calculated data from the State Estimator, and their impact on the computer calculation cost. Figure (4) shows the total system cost index determined for the TRCC SCADA/EMS system in 2010 and 2013. Figure (5-4): TRCC Total System Cost Index according to GECOL audits An initial audit was done in 2010 and achieved a cost score of 4000. As will be noted from the graph, GECOL was approaching a “Fair” level of data quality. Subsequent to 2011, GECOL carried out a new audit in 2013 with the support of the system supplier. At the start of the 78 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE audit the score was found to be 15300, a large degradation from 2010. Concerted effort at solving the data quality problems over the period of the audit reduced the index to 10000. This was a significant improvement but still well above the 2010 figure of 4000 and far from the target of achieving Fair to Good data quality assessments. A large cause of the degradation has been the loss of good quality data available from the stations due to failures of the telecommunication system, of the substation RTUs and DCS systems, and of the measurement transducers and other equipment in the substations. It is clear that over the past years the problems have continued and worsened rather than being resolved. 5.1.4 Benghazi Regional Control Center (BRCC) As with Tripoli, Benghazi had its first Generation and Transmission control and dispatch center around 1977 to coincide with the introduction of the 220kV grid. In 1995 Benghazi had a new Siemens Spectrum based control center which is still in partial service. However, as part of a policy decision to unify its control infrastructure, GECOL contracted with Alstom to install an e-terrahabitat based system similar to those of the NCC and TRCC. The project had neared conclusion when the contractor withdrew in 2011 due to the local security situation, before completing the commissioning of the new system. BRCC control engineers now find themselves in the peculiar situation of having both systems operational in the control room with a workstation connected to the old Siemens system and another to the new Alstom system. Some 70% of the substations under the BRCC control have been modelled in the new SCADA database, 55% connected. However after reaching a high of 19 substations being accessible to the operators, now only 7 are visible. Most have been lost to the system because of communication system failures, in particular loss of much of the fiber optic network. The security situation led to the supplier withdrawing from the BRCC site before the Site Acceptance Tests were completed, and a combination of security and financial issues have thus far prevented the work being completed. GECOL has now reached an agreement with the supplier to complete the tests remotely, with the GECOL engineers carrying out the work locally. It is expected this agreement will be implemented in the coming weeks. GECOL’s assessment is that the staff working on the hardware and software system have been well trained in line with the project scope and have gained much additional experience over the past years the system has been in service. To help resolve some of the connection problems, namely those due to RTU problems or incompatibilities, GECOL has contracted to replace 19 RTUs with Digital Control Systems (DCS) in the substations. The project is currently on hold awaiting opening of a letter of credit to the supplier. 79 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5.1.5 Distribution Control Centers (DCC) The Tripoli center was responsible for city’s sprawling 30kV network, the Benghazi center for that city’s 11kV network, and Tobruk center for the local 30kV and 11kV networks. The original control center equipment has long been out of service, and GECOL has more recently contracted to install 10 new control centers in the cities of Tripoli, Benghazi, Zawia, Sebha, Misurata, Beida, Gharyan, Sirt, Tobruk, and Sarir (Figure 5). Figure (5-5): Distribution Control Centers hierarchy. Priority DCC’s in yellow The project is not turnkey. While the supplier, Siemens, is responsible for the control center SCADA and DMS systems, GECOL has agreed with ABB on the telecommunications infrastructure, which is mostly fiber optic cables paralleling the routes of the 30kV cable networks between substations, and GECOL is directly responsible for the adaptation and modification works at the substations to prepare them for connection to the new DCS’s. This combination of responsibilities and division of roles has led to complex project management demands on coordination between the parties, and GECOL has generally been behind schedule in delivering the parts of the works under its responsibility. Of course, the events post 2011 have further complicated matters, and even several of the control centers that had advanced in the erection works were damaged by the conflict or subject to vandalism. As a result, GECOL decided to focus on the 5 distribution control centers with the greatest possibility of completion within a reasonable timeframe, namely Tripoli, Benghazi, Zawia, Sebha and Misurata, being the control centres most advanced in their installation works and/or least damaged by the fighting and hostilities. Of these, the SCADA systems were put in operation in Tripoli, Benghazi and Zawia. By 2014, when works by the contractor came to a renewed halt, Site Acceptance Tests were almost complete in Tripoli, well underway in Zawia, and were planned to begin in Benghazi. Tripoli is in the most advanced state, having been mostly commissioned, but not contractually handed over, in early 2014, but even here only 60 out of some 104 substations in the Central Tripoli area that have been commissioned and connected are currently 80 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE actually working and accessible to the Tripoli DCC. This also compares with the total of some 245 substations that are supposed to be connected to the DCC SCADA system covering Greater Tripoli and outlying regions. Most of the problems are due to RTUs, others to failure of communication links. A major constraint on expanding the number of substations working with the SCADA system is staff capabilities. Most of the persons trained by the contractor on modelling the substations in the control center and entering the data into the system have transferred out of the DCC, and no one currently working there has the knowledge to complete the data entry work. Additionally, the system is Unix-based and DCC staff are not experienced with the operating system. Since the contractor pulled out of Libya in 2014, GECOL has only now been able to arrange training for one software engineer, to be held in Tunis. Despite this, control and monitoring of the Greater Tripoli Medium Voltage network is dependent on the substations that are accessible and visible to the control room engineers and the telemetry data received from those substations. Key parts of the central Tripoli network are visible to the engineers, from which they can derive a general understanding of the remaining network. Current power outages in Tripoli that can last six hours or more have acted as an additional constraint. Batteries at the substations are generally old and provide power to the substation equipment for only some 3 to 4 hours. In some substations batteries have been replaced and the new battery sets can provide some 6 to 7 hours. Of course, with power cuts that last 8 or 9 hours, this is still not sufficient. Other problems faced have been theft of batteries and damage to switchgear by attempts to steal copper, even from the contact fingers of circuit breaker trucks. As with the transmission system, actual switchgear operations are manual and carried out by GECOL operators in the field. Tripoli is divided into 20 operations points, located in one of the key substations in the city and manned 24/7, with each responsible for around 10 substations. Operators move from the operation points to the substations where switching or other operations are required. In 2007 to 2009, GECOL contracted with the Korea power utility KEPCO to develop a set of distribution standards covering the 66kV, 30kV and 11kV systems and equipment. This included operations and safety rules. Discussion with the control engineers indicated that they had no knowledge of these rules and standards. They operated the system based on their experience and in line with the documents and forms they had in hand, such as the Permit to Work forms that specified directly some of the safety precautions that needed to be in place to allow persons to work on the system. As with the other planned DCC’s, the Tripoli DCC has a second control room for the 11kV network. This is currently not in use. 11kV control engineers occupy a small office and monitor and supervise 11kV network operations using pen and paper. This is the situation at all other 11kV control points in the Libyan network. 81 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE It is worth noting that management responsibility for the two control rooms at the DCC is split, with the Medium Voltage General Department responsible for the 30kV control room and the Distribution General Department responsible for the 11kV control room. With respect to the remaining priority distribution control centers, Benghazi system installation has been completed and some 80% of the substation and communications systems have been put in place. Some of the fiber optic cables have since been damaged and need repair, and the SCADA/DMS system is also in need of an upgrade. At Zawia, over 85% of the communications and substation works have been completed and the central SCADA/EMS equipment has been installed. Commissioning was begun but not completed in 2014. Also some of the fiber optic cable links have been damaged and require repair. In Sebha almost all the substation and communication system works have been completed, but the central SCADA/DMS system was vandalized after installation. In Misurata over 80% of communication and substation works are completed and the central SCADA/AMS system installed but not commissioned, and has not been put in service yet. 5.1.6 Generation Dispatch and Transmission Network Control In its periodic reports, the General Control Department describes its key activities at present as:  To maintain the safety and stability of power grid despite the major damages the network equipment has been subjected to, to resolve the bottlenecks resulting from damage to some parts of the transmission system through modifications to the operational configurations of the grid.  Coordination with other GECOL departments to address the bottlenecks in the transmission network and develop suitable solutions to maintain the stability and flow of power in a manner that assures the ability to carry out and secure a large number of emergency disconnections on the 400/220kV transmission, all the while preserving optimal operations of the power grid.  Coordination with the General Transmission Department to carry out its periodic and emergency maintenance of the 400/220kV transmission equipment.  Coordination with the General Generation Department to carry out its programmed and emergency maintenance of the generating units at the various power generating plants.  Calculation of the energy exchanges between Libya and each of Egypt and Tunisia on monthly and quarterly basis.  Prepare the daily load forecasts.  Carry out energy demand balancing studies weekly, monthly, quarterly and annually. To carry out these duties, the Control Centers depend on three main assets: the computerised SCADA systems, described in the previous sections, its human operators, and the procedures and structures put in place to assist and guide the control function. With the 82 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE limited function of the installed SCADA systems, the quality and capabilities of the control staff and the procedures they follow become all that more critical to successfully manage and maintain the Libyan power network. GECOL has realized this fact and contracted with the French RTE International in the mid and late 2000s to further develop control function capabilities through assessment, training and certification, and development of the required control related rules and procedures. This was to be a multi-phase process, but only the initial stages had been completed when RTE’s participation came to a halt with the events of 2011. RTE did manage to make an assessment of the control staff and provide basic training for the NCC, TRCC ad BRCC. GECOL operators have in general received no formal training in control of power networks other than the basic training provided by RTE in 2010. RTE also proposed a new delegation of authority and division of responsibilities between the national and regional control centers. However, the detailed description of the new distribution of roles was not completed, and rather than enhancing the function of the control centers it has led to some confusion and uncertainty. GECOL acted in 2013 to bolster its operations staff, recruiting the best graduates in Power Engineering from Tripoli University. The knowledge and experience these young engineers, who now make up almost 40% of the NCC and TRCC operations staff, have gained over the past four years have allowed the older and more experienced control engineers to focus on the more critical activities of the Control Centers, acting as shift supervisors and arranging and coordinating the manual load shedding programs. As a result, and unlike the situation in Generation, the Control Centers do not face a dangerous generational gap or deficiency in capable manpower. As part of its induction program for new control engineers, the Control Department sends them for a period of 1 to 2 months to work in Transmission substations and around 4 months in power plants to become acquainted with the network, people and work methods. More recently, because of various constraints these periods have been reduced from months to weeks, limiting the knowledge the newest engineers have of the systems they are dealing with and controlling. These secondments to their counterpart departments are very important in developing both a mutual understanding and relationship that will simplify and support cooperation between the control engineers and the station operators and maintenance teams, and ensure a better response during emergency and abnormal conditions. At the present time the control centers and their staff continue to follow the procedures and practices that had existed in the past without their modernization and development in line with the best international norms. To a large extent these practices and procedures are 83 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE not formally documented but are understood and have become established between the control personnel and network operators in the generation and transmission systems. GECOL has written formal, but not comprehensive, safety rules and operation procedures documents that provide the basic requirements and conditions that need to be met. Also inherited from past regulations that had been put in place in the 1970’s is the concept of “Authorised Personnel”. Authorized Personnel are to be found in the control centers, generation operations and maintenance staff, substation operators, and network maintenance teams. They are the persons that are permitted to issue operations instructions and approve issue of permits to work, to carry out the operations of the generation and transmission infrastructure, and to issue and supervise maintenance activities. GECOL has set up two permanent authorization committees, one in the west of Libya based in Tripoli, and the other in the east based in Benghazi. The Control, Generation, Transmission and Medium Voltage departments periodically nominate personnel to be authorized by these committees. The nominees should, in principle, have at least 3 years experience. The committees subject the nominees to a general written exam that evaluates their understanding of the control and safety regulations. Those that pass the written exam then go through an oral and practical exam specific to the area and activity to which they are to be authorized. While originally authorizations were limited geographically and in the types of equipment etc that they were allowed to work, this was subsequently broadened so that, for example, an authorization to operate 220kV switchgear was valid for all 220kV switchgear throughout Libya. We would also note that in none of the locations we have visited, including control centers, maintenance departments, substations, and power stations, were GECOL’s published safety rules and operations regulations easily available and on hand when we requested to see them. GECOL, with the assistance of its Italian consultant CESI, has also developed a Network Defense Plan to protect the power network and generation plants and help prevent major events such as blackouts. This plan was put into operation in 2009 and included automatic underfrequency load shedding and network islanding schemes. Since then the network has faced major power shortages, large manual shedding of network loads, network operation at lower than nominal frequency, changes to the network configuration due to loss of several transmission lines and substations, and connection of a number of new generating units. All these significantly infringe on the basic design assumptions of the original Defence Plan. These developments have required GECOL to reconsider the defence plan and to make adjustments to the original scheme. In 2012, CESI undertook with GECOL to carry out an update to the Defence Plan. Events and circumstances in Libya prevented this work from being concluded. GECOL then proceeded 84 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE to revise the plan on its own. Due to constraints on time and other resources, the changes to the Defense Plan were made based on network knowledge, operational experience, and a strong engineering sense rather than on modelling and simulation studies of the power network. The updated Defense Plan now includes:  Additional loads connected to the automatic underfrequency load shedding, but with a slight time delay  Rotation of loads connected to the first stages of the underfrequency load shedding. Due to the large power shortages, even minor network events can lead to operation of these stages. Rotation of the loads reduces the stress on affected consumers.  The number of load shedding stages has also been increased from 6 to 8.  Some transmission substation transformers have been added to later stages (48.5- 48.6 Hz) to provide a bulk load shed ability in case of very severe network events.  Adjustments of some generator overfrequency trip settings by reducing the time delays so as to have some discrimination in loss of similar units, in the hope that outage of some units earlier will allow the frequency to recover before all generation is lost.  Earlier network islanding. As a result of the series of blackouts GECOL has faced, the hope is that isolating the generating plants and their respective network loads at an earlier underfrequency stage could help maintain at least some of the generating units and make system recovery faster and easier. To ensure secure operation of the GECOL power network, GECOL needs to carry out new comprehensive studies to develop the defense plan in line with the development and changes in the power grid, including the impact of new generation, and in particular the new Ubari power station in the far south west of Libya. Of course, in the current security environment in Libya a major problem faced by the control engineers at the control centers is having operators at the substations follow the instructions to switch off loads as part of the manual load shedding plan to deal with the acute power shortages. The substation operators are all too often threatened with force by local militias and others to prevent them switching off the local loads, and they therefore will not follow instructions. This situation is compounded by the fact that the NCC, TRCC and BRCC do not remotely operate the switchgear and are dependent on human operators having access on site to the switchgear to be operated. It has been estimated that external threats and similar factors influence and prevent load shedding on around 15% to 20% of network loads. The exact figure can vary from day to day and is subject to negotiations and agreements with various factions and regions. Recent blackouts have also strongly supported GECOL’s argument to the general populace of the need to shed load to protect 85 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE the power network from more severe disruptions. This has helped reduce, but not eliminate, pressure and actions that block operators from shedding load manually. Shift duty at the control centers is normally on a weekly rotation of 8 hours, moving from morning, to afternoon to night and then 1 week off. During the current power shortages and manual load shedding requirements, the NCC and TRCC have moved to a 24 hour rota to be in line with the shift duty at the substations, to ensure that operators at the substation are dealing with the same Control Engineer throughout and avoid confusion and errors. The NCC and TRCC have also temporarily merged into a single control to further focus the availability of qualified staff to deal with the current circumstances. Shift engineers and the shift supervisors are delegated with limited responsibilities. They can deal with routine matters and most daily network requirements, but major decisions and matters that relate to outages have to be approved by or agreed with the Control Center Manager. The Manager (or his delegated deputy) is therefore considered on call and required to be available 24 hours a day, every day. In our view, the biggest problem control of the Libyan network is facing in the current power shortage situation is almost continuous operation with no spinning reserve. In fact, this is not a new situation. We have been informed that through most of the 2000’s the GECOL network has been operated with little or no slack in its power generating capacity. However, the current backlog of maintenance works and added ageing of the generating units means the units are in a worse position to react to network incidents and makes the loss of units in such events more likely, and also makes it more likely there will be additional difficulties in getting generating units back on line after they are tripped. This further compounded by the limited functionality of the control centers’ SCADA systems. The control operators have a more limited view of developments in the power network and therefore will have a slower response to deal with situations as they develop. The greatest indication of the stress the Libyan power network is under and the threat that represents to network stability is the frequency situation. GECOL has often had to reduce the network operating to below the nominal 50Hz, at times for sustained periods as low as 49.6Hz. As a result, the Control Dept has had to lower the frequency excursion limit from a lower limit of 49.75Hz to 49.5Hz. Despite this, the network frequency has exceeded the new limit some 1,170,104 times in the third quarter of 2016. The reason can be clearly seen in Figure (5-6), compared with Figure (5-7) and their superposition in Figure (5-8). In the former the extreme variations in frequency is extreme as loads are shed and reconnected, the frequency was under 49.5Hz for 3.55 hours, and fell as low 48.86 Hz, all an indication of the slow manual response of the system to the power shortage and load shedding conditions. In the latter the frequency is much more stable, never falling to less than 49.75Hz. The frequency variation that is displayed in this case would appear to be a strong argument for the need to put AGC functionality back in service. 86 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (5-6): Network frequency over 24 hours during power shortage (14/08/2017) Figure (5-7): Network frequency over 24 hours during no power shortage (30/09/2017) 87 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (5-8): superposition of the network frequencies in Figures (6) and (7) above GECOL has faced a number of blackouts in both the Western and Eastern power networks, which have been isolated from each other for most of the past three years. All the blackout events in the western network have been instigated by a transmission network fault. While each event needs to be studied on its own and the reasons each developed into a blackout determined, and from that the suitable corrective and preventive actions can be determined, it is also true that general factors that help maintain network stability and speed up the response of network control engineers to contain such incidents and prevent them becoming blackouts almost certainly include:  A suitably sized spinning reserve  Fully operational SCADA systems to monitor and control the power network GECOL is currently lacking both, and priority should be given to putting them back in place. To fully analyze system events and carry out a detailed post mortem, fault and event recorders distributed throughout the power network and time synchronised by GPS signals are critical. GECOL has fault recorders in most substations, but many are not operational. This is another important action to help deal with the critical system events GECOL has been facing. We note that GECOL is working to import some 16 new IDM digital fault recorders, which is an important and commendable first step. In general, it has been noted that there is difficulty in collecting all information necessary to properly analyze fault events because of the wide departmental and geographic area that normally has to be dealt with. It might be advisable for GECOL to consider setting up at least one interdepartmental team whose members would be senior engineers from all relevant departments (Control, Transmission, Medium Voltage, Distribution, and Telecommunications) and geographic regions. The team should have the authority to obtain records and logs as well as carry out interviews. They should be able to initiate investigations on their own initiative following system events and not await instructions from the Managing Director or other GECOL authority. Their remit should be to determine 88 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE the (technical) causes of incidents and provide advice and recommendations to prevent similar happenings in the future, not to lay blame or cause punishment. The GECOL Control General Department does, of course, also carry out its own investigations of system events, through its Operations Studies Departments. Of the four blackouts that have occurred in 2017 to date, it has noted that: - Outage of some transmission lines has reduced the operational reliability of the GECOL power system - All blackouts were triggered by a fault in the transmission network, followed by loss of generating units - The Southern Region has suffered from voltage instabilities - The power network displayed significant frequency rise following the initial transmission fault clearance - The data that could be collected on the frequency and voltage response of the power system to the initial transmission fault and clearance pointed to the possibility a phenomenon known as “Fault-induced delayed voltage recovery” (FIDVR) as being the cause of the frequency rise and loss of generation. This phenomenon has been noted to occur in networks with very large inductive motor loads, and in particular air conditioning loads. That the Libyan network is saturated by air conditioning loads is well known and easily confirmed by the fact that over a 2 week period in September 2017, with the end of summer and moderate temperatures prevailing, the Libyan peak load fell by almost 2000MW, mainly because consumers did not need to use their air conditioning. If this is the main cause of the recent blackouts, there are no confirmed solutions to the problem, and it deserves more study and evaluation in the Libyan context to determine possible corrective and preventive measures. 5.1.7 Telecommunications The impact of the telecommunications system on the SCADA system has been made clear in the previous sections. With so little of the telemetry and telecontrol available to the control engineers, voice communications with on site operators becomes critical, both to be informed of the situation on the ground and to give instructions to the operators. GECOL has a multi-level system of voice communications that provides a degree of redundancy. At the highest level is GECOL’s private telephone network carried over GECOL’s fiber optic system, mostly OPGW. This provides the best and most secure communications medium. In parts of the network the fiber optic is backed up by power line carrier (PLC) communications links. 89 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE At the next level, AlMadar mobile phone company has provided GECOL with a private mobile communications network, carried on Madar’s public mobile network. User’s on this network use special mobile handsets that can only call other users with similar handsets. Mobile VHF radio is also used as a backup communications medium in some towns and cities. UHF fixed radio is available for communications with far off stations, particularly in the desert regions. At the lowest level is the normal public mobile telephone network and fixed line telephones. In communications with the control centers in the neighboring networks of Egypt and Tunisia, the NCC uses normal landlines telephones and email. Originally, biannual meetings were also organized for face to face discussions between the sides, but these have been discontinued in recent years due to local and international circumstances. The critical element in the telecommunications setup is GECOL’s fiber optic network. There are at least 47 complete or partial cuts and breakages in the fiber optic OPGW conductor in 31 of GECOL’s 400kV and 220kV overhead lines. Reasons for continued outage of so many parts of the OPGW links have included insufficient experience and knowledge by the overhead crews in working with OPGW conductors and the difficulties in arranging outages for many of the affected lines because of the disruptions this will cause in the power network, isolating some power plants and causing additional power loss to consumers over and above the load shedding they are already suffering. 5.1.8 Demand side management (DSM) Demand side management endeavours aim to control or limit the demand for electric energy. They can be designed to reduce or redistribute the peak demand for power, i.e. reduce the value of peak load, or to reduce the overall demand for electricity, thereby reducing the annual energy consumption. While both are important and relevant to GECOL, the priority in the short to medium term should focus more on reducing peak power demand. GECOL implemented the first phases of a Demand Side Management study in 2010. The study determined the average daily load curve during the summer and winter peak periods and the contribution of each consumer sector to the load curve, as well as a breakdown of the end-use contribution to this demand. These results are presented in Figures (5-9) to (5- 12). 90 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (5-9):Winter average load curve by sector Figure (5-10): Summer average daily load curve by sector Figure (5-11): Winter peak demand by end use 91 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (5-12): Summer peak demand by end use The study found that:  In the winter peak loads the residential and commercial sectors are the largest contributors to the peak demand o Together they constitute 51% of the total demand  In the summer peak loads residential and public lighting sectors are the largest contributors to the peak demand o Together they represent 42% of the total demand Subsequent reviews cast doubt on the size of public lighting demand, and considered it had been overestimated by up to 10%. From the figures we can see that there is considerable potential to reduce peak loads through promoting the use of more energy efficient equipment such air conditioners, water heaters and lighting. Encouraging the shift to solar water heating is also an option. Large irrigation demand could also be replaced with solar powered water pumping and irrigation systems. 92 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5.2 Points of concerns 5.2.1 Immediate concerns  Cut and broken OPGW conductors and fiber optic links has led to widespread disruption of the telecommunications network. It is crucial that urgent action is taken to repair all damaged OPGW conductors.  Low quality of data received at control centers. In addition to the problems in the fiber optic network, there are problems at other points of the data chain, from the transducers, relays and contacts supplying the data at the substations and power stations, to the RTU and DCS systems of those stations, to the telecommunications terminal equipment. From GECOL’s own experience, it is not always easy to determine, or even follow up, the source of the data supply problem, with different parts of the data chain being the responsibility of different departments. The best results have been obtained when multi-disciplinary, multi-departmental groups were formed to follow up, in coordination with the control centers, problem data points and to determine, as a team, the source of the problem. The relevant member of the team then takes action to resolve the problem.  GECOL needs to resume work on the delayed control centers projects. GECOL’s plans for the NCC, TRCC, BRCC and DCC’s are all important for the efficient, stable and safe operation of the power system and to provide the best service to GECOL’s customer base. Fulfilment of these contracts needs to receive as high a management priority as work towards overhauling power stations and providing new generation capacity.  Training of staff. Control engineers require additional training on the use of the advanced EMS functions available in the national and regional control centers and the DMS functionality of the distribution control centers. Software and hardware engineers require additional training on the substation DCS systems. Overhead line teams and telecommunication engineers require additional training to deal with the problems on the fiber optic network. Training on substation modelling and data entry is particularly required for the distribution control centers, not least at Tripoli DCC. Distribution control engineers need complete retraining to be able to use the 11kV control room and facilities at the Tripoli DCC.  Utilize SCADA control capabilities. GECOL needs to move away from dependence on human operators for all control operations at substations, and use the control capabilities of the installed SCADA systems. This will improve reliability, accuracy and speed of operations and remove one layer of possible human error, and almost eliminate the external threats operators currently face.  Provide a spinning reserve. GECOL should endeavour to provide sufficient spinning reserve to provide a minimal level of contingency capability to respond to network 93 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE incidents and events. This should be an accepted part of network operations even under power shortage situations. It is in fact under these circumstances in which the network is already stressed and stretched that the spinning reserve could spell the difference between short time load shedding affecting a limited number of consumers and longer time recovery from a blackout affecting all consumers.  Organized, structured and automatic analysis of network events. There needs to be a permanent interdepartmental team of senior and experienced engineers that immediately starts to investigate, collect data, analyze, and determine the causes behind all major or serious network events. GECOL should not have to depend on ad hoc teams formed for each event independently nor until senior management instructs that an event needs to be studied and analyzed. The team should have the authority and tools to carry out its duties, and should not be conceived as a threat but rather as an important element to improve GECOL performance, to learn lessons from and prevent repetition of any network incident. In parallel GECOL should proceed to install new fault and event recorders as required and put back in service recorder where possible. 5.2.2 Longer term concerns  Reinstate AGC functionality. AGC has to be made functional for the majority of generation units and put back in service. This will improve network stability and frequency response, providing and better quality service to consumers.  Renew the contract with RTE or a new contract along similar lines to help fully qualify control staff and update or develop the rules and regulations, such as a Grid Code and formal safety rules, necessary for the most efficient and safe operation of the power system.  Implementation of DSM projects can help reduce demand and mitigate the need for some of the new large power stations and expansion of existing power stations. 94 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 5.3 Control action plan 1. Failure of communication links Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Set a priority list of the damaged OPGW and fibre optic cables that are most critical to the control centres and 01/01/2018 1-2 months allocate necessary budget for their repair works Repair damaged OPGW Execute/outsource the reparation of the broken and Restored damaged OPGW links 01/03/2018 1 year damaged links links Ensure in future repair of FO links has same priority as 01/01/2018 ongoing repair of OHLs Form interdepartmental multidisciplinary teams to determine and fix problems in data from substations, 98% visibility of bad data 01/03/2018 1 year including problems with RTUs, DCS and telecomm sources resolved Solve bad data quality equipment issues Set up regional task forces to assess and repair DC systems, especially in MV and distribution substations, 01/01/2019 1 year 0.8 affecting operation of DCCs 95 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2. Delayed control projects Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Replace 19 RTUs and 1 DCS in Eastern region Transmission substation and 20 RTUs in Western 01/01/2008 6 months Region Upgrade NCC 01/01/2018 1 year TRCC maintained and Upgrade TRCC 01/01/2019 1 year upgraded NCC upgrade and back-up Install new back-up NCC 01/01/2020 1 year completed Complete control centre projects BRCC commissioned and Complete commissioning of BRCC 01/01/2018 6 months operational TDCC, ZDCC and BDCC Complete commissioning of Tripoli, Zawia and 01/07/2018 2 years commissioned and Benghazi DCCs operational Complete S/S adaptation works, installation works and commissioning of Misurata and Sebha DCCs and their 01/01/2019 3 years telecommunication links, renegotiating, revising, and making new contracts as necessary 96 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3. Operational deficiencies Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Utilize SCADA control Utilize SCADA control capabilities at existing control 80%-90% of SCADA system 01/01/2018 Ongoing functionalities centres to carry system control functions control funct. In use Provide sufficient spinning reserve to improve network Adequate spinning reserve Provide spinning reserve 01/01/2018 ongoing stability and security is maintained Create permanent interdepartmental team(s) of senior and experienced engineers to immediately respond to and investigate network incidents, determine causes 01/03/2018 ongoing and recommend corrective and preventive actions, Form permanent event equipped with necessary tools and authority analysis team(s) Install new fault or event recorders as required in key points of the power network and put existing 01/01/2018 9 months 2 recorders back in service at power plants and transmission substations Reinstate AGC Reinstate AGC functions at NCC and power stations 01/01/2019 6 months All AGC are operating functionality Resume work with external consultant on issuing a Control codes and Modernize procedures GECOL grid code, operating and safety rules, and train 01/03/2018 1 year procedures are and codes Control and other staff on these rules and standards implemented 97 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4. Skills shortage Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Renew contract with French TSO RTE or find alternative service provider to develop Control staff, 01/01/2018 2 years 3.5 Control Centre procedures, Codes, rules and regulations Pursue staff development Train control engineers on use of EMS and DMS and training functionalities, software engineers on substation 01/01/2019 6 months modelling and data entry Train MV and Distribution control engineers on the MV All control staff trained 01/01/2020 1 year and Distribution control facilities in the new DCCs and certified 98 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 6 Medium Voltage (Subtransmission) 6.1 Medium Voltage cables and overhead lines This section looks at the status of GECOL's medium voltage feeders (underground cables and overhead lines), their availability, the reasons of non-availability, their fault rates, their operating regimes, and recommendation for performance improvement. In total there are approximately 8853kmof30kV feeders and some 12174km of 66kV feeders. The total MEAV of these assets is up to €1.5billlion. 6.1.1 Investment Strategy 6.1.1.1 Overhead lines: All medium voltage overhead lines constructed before 2007 were strung on steel lattice towers of 32 meters height in either single circuit or double circuit configuration. The same design of tower was used for the 66kV lines and 30kV lines to allow for upgrading the 30kV lines to 66kV lines if and when required. That design was very expensive and led to reluctance in approving construction of new lines in many rural areas. After 2007 GECOL established the design standard of 30kV and 66kV single circuits on wood poles for the sake of cost effectiveness. Only a few overhead lines have been constructed according to the new design on wood poles with a total of few tens of kilometers. The standard conductors GECOL uses for its medium voltage grid are as follows: Code Cross-sectional area (㎟) CCCA number Al St Total [Ampere] Bear 264.4 61.7 326.1 521 Lion 238.3 55.6 293.9 472 Tiger 131.2 30.6 161.8 380 Zebra 428.9 55.6 484.5 631 Penguin 107.2 17.9 125.1 253 Table (6-1): Old ACSR conductors AAAC conductors ACSR conductors Cross- Code Number of Code Cross-sectional area (mm2) sectional CCC (A) number CCC (A) number wires area (㎟) Al St Total 125 144 19 369 125 120 19.6 140 364 160 184 19 432 160 154 25 179 426 200 230 19 497 200 192 31.3 223 490 250 288 19 573 250 240 39.1 279 564 315 363 37 662 315 303 49.3 352 654 Table (6-2): New AAAC and ACSR conductors used by GECOL Table (6-3) shows the GECOL investment in medium voltage overhead lines since 2007: 99 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Contract % of procurement % of Installation Description Contract value no. work work Procurement and installation of [500km] 30kV and 66kV 16-2002 LYD21,351,047 100% 65% O/H lines in all Libya Procurement and installation of [650km] 66kV double 18-2007 LYD51,191,555 60% 15% circuit O/H lines in all Libya Table (6-3): Investment in MV overhead lines The major obstacles delaying the installations of the 16-2002 and 18-2007 contracts are security issues, reluctance of foreign contractors to come to Libya, and objections of land owners. In addition to the above mentioned contracts, GECOL had contracted in 2010 for the maintenance of about 1500km of 30kV and 66kV overhead lines with one of its subsidiary companies (contract no. 2/2013), but GECOL couldn't open the LC of this contract due budgetary constraints. 6.1.1.2 Underground Cables: GECOL’s strategy is to feed all highly populated urban areas with underground cables regardless of the voltage level. Before 2013 all underground cables were of copper conductors and steel or aluminum armored. The medium voltage cable types used before 2013 are listed in the following table: Cable type Purpose 1 N2XCY 1×400 R/V 8.7/15 kV For connecting the power transformers 66/11kV and 30/11kV to the 11kV main switchboard 2 N2XSAY 1×630 R/V 18/30 kV For sub-transmitting power in high density populated areas 3 N2XCEBY 3×240 R/V 18/30 kV For sub-transmitting power in low density populated areas 4 N2XSY 1×500 R/V 36/66 kV For sub-transmitting power in high density populated areas Table (6-4): Old MV cables used by GECOL (pre-2013) Since 2013 GECOL renewed its specification and changed to use Aluminum in the medium voltage network and the standard cables since then have become as follows: 100 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Cable type purpose 1 NA2XS2Y 1×630 R/V 8.7/15 kV For connecting the power transformers 66/11kV and 30/11kV to the 11kV main switchboard 2 NA2XS2Y 1×630 R/V 18/30 kV For sub-transmitting power in high density populated areas 3 NA2XCEBY 3×240 R/V 18/30 kV For sub-transmitting power in low density populated areas 4 NA2XS(FL)2Y 1×630 R/V 36/66 For sub-transmitting power in high density populated kV areas Table (6-5): New MV cables used by GECOL (from2013) The most recent investment in medium voltage cables was in 2010 with the following quantities: Description Quantities in km 1 36kV, XLPE cable (N2XSAY 1×630 R/V 18/30kV) 1x630mm 2 300 2 36kV, XLPE 3X240mm2(N2XCEBY 3×240 R/V 18/30kV) 100 3 72.5kV, XLPE cable 1x500mm2 (N2XSY 1×500 R/V 36/66kV) 100 Table (6-6): New investments in MV cables from 2010 Most of these quantities have not been installed according to their original plan, and instead they have been used as solutions for the war damages. GECOL had called for a tender to procure 2800km NA2XS2Y 1×630 R/V 18/30 kV cable, and 600 NA2XS(FL)2Y 1×630 R/V 36/66 kV cable, but budgetary constraints stopped the tendering process since 2015. 6.1.2 Description of 66kV & 30kV lines (cables and overhead lines) population In this section we will consider 66kV and 30kV underground cables and overhead lines (collectively to be called MV lines). In total there are approximately 21,000km of MV lines: 8853km of 30kV overhead lines and cables and about 12174km of 66kV overhead lines and cables. These are distributed among regions according to Table (7): Region 30kV lines 66kV lines Western 2338.307 1985.14 Tripoli 2819.298 125.45 Benghazi 1844.92 1810.57 Green Mountain 647.02 1980.028 Middle 1203.024 2842.18 Southern 0 3431 Totals 8852.569 12174.368 Table (6-7): MV lines by region 101 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3500 3000 2500 2000 1500 1000 30kV feeders 500 0 66kV feeders Figure (6-1): MV lines by region Figure (6-1) shows that all regions except Tripoli have considerable lengths of 66kV feeders (the majority of which are overhead lines). Tripoli, Western, and Benghazi are characterized more by 30kV feeders (the majority of which are underground cables). 6.1.3 Condition of GECOL's MV lines, faults and outages The statistics of MV line outages over the period 2007 to 2016 (data are missing for years 2010 and 2011) show that continuous improvement was taking place in the years 2007 to 2009, and sharp increases in feeder outages have taken place since 2011. 30kV Feeder 66kV Feeder Trips Trips 2007 1033 2007 374 30kV feeder interruptions 66kV feeder interruptions 2008 865 2008 508 2009 728 1500 2009 342 1000 800 2010 2010 153 1000 600 2011 2011 400 2012 528 500 2012 200 2014 492 0 2014 307 0 2015 937 2015 458 2016 1273 2016 801 Figure (6-2): Outages of MV lines The sharp increases in fault rates after 2011 are attributed to war damages and difficulties facing maintenance staffs. Comparing the fault rates in 30kV network, 66kV network, and the primary 11kV network originating from 66/11kV and 30/11kV substations in the following Figure (6-3) and chart will shed lights on other issues. Figure (6-3) reveals the following: 1. The fault rates of the primary 11kV lines are much less than those of 30kV and 66kV feeders. Considering that numbers and lengths of the primary 11kV feeders are at least four times the numbers and lengths of the 66kV and 30kV feeders, we conclude that there are real technical issues with medium voltage lines. 102 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2. The fault rates per kilometer of the 30kV lines (the majority of which are underground cables) are, surprisingly, more than the double of the fault rates of the 66kV lines (the majority of which are overheadlines). Analysis will therefore be focused on the 30kV cables network in the following section. 30kV 66kV 11kV Year 1400 Feeders Feeders Feeders 30kv Feeder 2007 1033 374 547 1200 66kV Feeder 2008 865 508 724 1000 11 kV Feeder 2009 728 342 733 800 2011 156 74 154 2012 528 486 467 600 2014 492 307 327 400 2015 937 458 416 200 2016 1273 801 608 Average 752 419 497 0 2007 2008 2009 2011 2012 2014 2015 2016 Av. Fault 0.085 0.034 - rate/km Figure (6-3): Fault rates for MV and main distribution lines 6.1.3.1 Analysis of 30kV cable network failures Reviewing GECOL's specification and supplier list for the power cables revealed that the specifications are to a very high standard and the suppliers are of sound reputation. These two strong points conflict with the high rates of cable failures. Reviewing the design and installation practices of GECOL, many incorrect practices become obvious, and in particular design and installation practices related to armored single core cables 1x630mm2 [N2XSAY 1×630 R/V 18/30 kV]. The most important incorrect practices are: - Laying the cables with excessive tension, without controlling the tension torque and without using rolling pulleys (reels). Lack of experienced and capable cable contractors equipped with the correct tools and equipment in many parts of the country is the main reason for this incorrect practice. - Metallic screens of most of single core cables are bonded to ground at both ends regardless the cable lengths. This causes excessive induced currents in the metallic screens and overheating. The following photographs were taken in GECOL medium voltage substations. 103 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE The Ammeter is clipped on the earthing tails of the metallic screens of the 30kV cable - Various incorrect practices in cable termination grounding such as connecting aluminum to copper, and connecting the grounding tails to the wrong places in the GIS body (see photographs below). - Cross-bonding and single-point bonding are proper solutions for the screened single core cables according to IEEE Std519, but unfortunately were not well practiced at GECOL as evidenced in the following photographs. - Another important issue is that the cable screen specification can withstand only 5kA fault current for one second. This condition is based on grounding the neutral of the 220/30kV transformers via 10 Ohms resistor. In practice many transformers 104 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE supplying the GECOL MV network are solidly grounded and the fault current exceeds 5kA. This has caused fire and damage in many sections of many MV lines. 6.2 Medium Voltage switchgear GECOL has some 21 old BBC 30/11kV substations with minimum oil type circuit breakers that need rehabilitation. This would include all of the following: - Replacement of about 200 minimum oil BBC circuit breakers, retrofitting with ABB vacuum circuit breakers. - Replacement of all the protective relays. - Renewal of control wiring GECOL also has around 33 GEC 30/11kV substations with type HMX switchgear installed in the 1990's. The circuit breakers are vacuum type and SF6 insulated. These substations need spare parts as well as complete new switchgear panels to carry out substation extensions. These requirements would include: - Few tens of Current transformers and voltage transformers sets - Few tens of busbar insulators - Few cable bushing spouts - Few hundreds of trip and closing coils - Few tens of spring charge motors - About 40 complete feeder panels for extensions Finally, GECOL has about 83 old and deteriorated substations that must be completely replaced with new substations. The details of these substations are: Manufacturer Technology Voltage [kV] Qty 1 REYROLLE Bulk oil 30/11 29 2 COGELEX Minimum oil 30/11 4 3 ENERGOINVEST Air insulated 30/11 21 4 SIEMENS SF6 gas insulated 30/11 14 5 SADELMI Minimum oil 30/11 4 6 GEC Bulk oil 30/11 3 7 AGC Minimum oil 30/11 1 8 WESTINGHOUSE Minimum oil 30/11 7 Table (6-8): Old substations requiring replacement by type 105 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 6.2.1 Analysis of MV switchgear failures All of GECOL’s medium voltage switchgear is from reputable manufacturers such as Siemens, Schneider, Alstom, ABB, and GEC. Most failures of the switchgear are attributed to the following causes: - Mal-operation of the circuit breakers: GECOL has a very large variety in the types of switchgear used, resulting in a great number of differences in their operation methods, their mechanisms, and their isolation and grounding methods. Operators get confused and at times incorrectly operate the circuit breaker against its interlocking or withdraw the circuit breaker truck against interlocking mechanisms. This causes damage to the circuit breaker mechanisms, or results in burning of close or trip coils. - Not-in-service circuit breakers of faulty feeders are usually withdrawn and left outside their compartments. Being left outside the protection of its compartment, the circuit breaker is exposed to dust and moisture accumulation that affect the moving parts of the mechanism. Moreover, operators sometimes would remove parts from breakers that are outside their compartments to be used as spare parts for other units. - Both the substation building specification and the index of protection of the switchgear are not suitable to protect the breaker mechanism against dust. The substation doors and windows are often open and cannot prevent entry of dust even when they are closed. The index of protection according to GECOL specifications is IP3X or IP4X. These two factors affected dramatically the service life of the switchgear mechanisms. These photos show MV switchgear with panel doors left partly open, breakers left racked out. 106 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE - Cable terminations and cable glanding: GECOL does not have detailed drawings for constructing the cable termination and glanding of cable, despite having issued a related construction standard. It is left to the technician's skill and knowledge, and they have often not used cable glands while enlarging cable entry openings into the switchgear, providing an opportunity for dust, moisture, and small animals such as reptiles and rodents to come into contact with life parts and cause flashovers. - In newer GIS type switchgear such as Schneider GHA and Siemens 8DA10, some of the above issues have been inherently mitigated by the GIS design. However, even in these GIS substations there have been multiple bay failures or that are out of service. This has been attributed to gas leakage and incorrect switchgear erection. - Un-ordered and even chaotic cable laying in the cable trench without cable cleats and without cable trays, open trenches left uncovered, the presence of bare grounding conductors touching the jackets of power cables, and litter collecting inside the trench all help to initiate fire, burn cable jackets. In addition to potential damage to cables, rising smoke can infiltrate switchgear and cause flash over on any exposed HV parts. 6.3 Medium Voltage power transformers This section considers GECOL's 66/11kV and 30/11kV power transformers, their availability, reasons of non-availability, fault rates, operating regimes, and recommendation for 107 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE performance improvement. In total there are approximately 1500 such transformers in the GECOL network with a MEAV of around €337.0 million. The total is broken down into: 30/11kv transformers 66/11kv Transformers Total numbers 1030 524 Average unit investment cost €206,000 €131,500 Grand Total €337,000,000 Table (6-9): GECOL MV transformers 6.3.1 MV transformers investment strategy Prior to 1996 the standard sizes of the 66/11kV and 30/11kV power transformers were 12.5MVA, 10MVA, 7.5MVA, 5MVA, and 2.5MVA. A large portion of those transformers were overloaded. Since then, GECOL has set up a strategy to replace all transformers in the urban areas with 20MVA transformers, and rotate the replaced transformers to rural areas. Almost all new 66/11kV and 30/11kV substations are equipped with two transformers and planned so that they represent full redundancy, i.e. each transformer is not to be loaded more than 50% of nominal rating. With this excess of capacity, GECOL inadvertently ignored the need to develop a strategy for replacement of old or faulty transformers. The result that in many cases stations with one of the two installed transformers defective is working “permanently” with only one transformer, violating GECOL’s n-1 rule. Table (6-10) shows the number of substations operating with one transformer by region. On average, isolation or fault of the remaining transformer at these substations will lead to local loss of supply to around 7.5MW for periods of several hours to several days, depending on the position of the supply ring connection on the 11kV side, or until the transformer is replaced. 30/11kV S/S’s with one transformer 66/11kV S/S’s with one transformer Tripoli 45 Western Region 22 1 Benghazi 12 4 Green Mountain 8 4 Southern 15 Totals 87 24 Table (6-10): MV substations operating with one transformer In addition, while the events between 2011 and 2017 have led to damage of many existing power transformers, it has also halted the construction of new substations related to Libya’s frozen development projects. This has allowed GECOL to exploit the transformers imported for these new substations as replacements for network’s faulty and damaged transformers. The ministry of Electricity also contracted in 2014 for 169 20MVA 30/11kV transformers, 108 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE and 63 20MVA 66/11kV transformers. These new transformers began arriving in GECOL’s warehouses in 2015. 6.3.2 Description of MV transformers population GECOL’s 1030 30/11kV and 520 66/11kV power transformers have ratings of 5MAV to 20MVA and are ONAN cooled. The numbers of transformers is given in Table (11) and Figure (5). Green Tripoli Benghazi Western Central Southern Total Mountain 30/11kV transformers 394 232 198 144 62 0 1030 66/11kV transformers 6 96 72 106 108 136 524 Table (6-11): MV power transformers by region Figure (6-4): MV power transformers by region From Figure (6-4) we note that the 30/11kV transformers are concentrated in coastal areas and exposed to severe moisture and corrosion. The 66/11kV transformers are located in more rural areas and many are in southern parts of Libya further from the coast. 6.3.3 Condition of GECOL MV power transformers and their defects Assessment of the condition of a power transformer requires some special tests and measurements to determine the condition of the solid insulating materials and the insulating oil. GECOL has a team equipped with modern testing devices like the Dissolved Gases Analyzer, but does not have a comprehensive or structured plan to check all the existing transformers with such detail. Instead, GECOL is focusing on checking newly procured transformers from various suppliers. The reasoning is that there can be a percentage of defective transformers among any new delivery. This plan has been successful, and has forced suppliers to acknowledge their defects. 109 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Statistics of failed Medium Voltage Power Transformers in the period 2012 to 2016 are listed in the tables below. 30/11kV Transformers 66/11kV Transformers Region Total number Total number of Transformer % Transformer % of transformers transformers failures failures failures failures (2017) (2017) Tripoli 41 394 10% 0 6 0% Western 17 198 9% 12 72 17% Middle 0 144 0% 7 106 7% Southern 15 0 0% 16 136 12% Benghazi 10 232 4% 13 96 14% Green Mountain 9 62 15% 6 108 6% Total 92 1030 9% 54 524 10% Table (6-12): MV power transformer failures 2013 30/11kV Transformers 66/11kV Transformers Region Total number Total number of Transformer % Transformer % of transformers transformers failures failures failures failures (2017) (2017) Tripoli 26 394 7% 0 6 0% Western 10 198 5% 2 72 3% Middle 10 144 7% 8 106 8% Southern 0 0 0% 18 136 13% Benghazi 7 232 3% 7 96 7% Green Mountain 5 62 8% 3 108 3% Total 58 1030 6% 38 524 7% Table (6-13): MV power transformer failures 2014 30/11kV Transformers 66/11kV Transformers Region Total number Total number of Transformer % Transformer % of transformers transformers failures failures failures failures (2017) (2017) Tripoli 48 394 7% 0 6 0% Western 16 198 5% 6 72 8% Middle 9 144 7% 1 106 1% Southern 0 0 0% 21 136 15% Benghazi 7 232 3% 4 96 4% Green Mountain 4 62 8% 2 108 2% Total 84 1030 6% 34 524 6% Table (6-14): MV power transformer failures 2015 110 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 30/11kV Transformers 66/11kV Transformers Region Total number Total number of Transformer % Transformer % of transformers transformers failures failures failures failures (2017) (2017) Tripoli 53 394 13% 0 6 0% Western 35 198 18% 5 72 7% Middle 4 144 3% 17 106 16% Southern 0 0 54 136 40% Benghazi 26 232 11% 10 96 10% Green Mountain 10 62 16% 11 108 10% Total 128 1030 12% 97 524 19% Table (6-15): MV power transformer failures 2016 The average failure rate for 30/11kV transformers is 9% per annum, the average number of annually failed 30/1kV transformers is 91 transformers, and the average rate of failure for 66/11kV transformers is 11% per annum, with the average number of failed transformers annually 56 transformers. This is a relatively high failure rate for such transformers. It is necessary to carry out a more detailed analysis looking at failure rates prior to 2011 to determine if the cause relates to armed conflict and similar events or if there are innate reasons related to the power network operations and maintenance regimen. Table (6-16) provides the failure rates of power transformers in the years 2007 to 2009. 30/11kV Transformers 66/11kV Transformers Year Transformer failures % failures Transformer failures % failures 2007 97 9% 36 7% 2008 113 11% 83 16% 2009 101 10% 79 15% Table (6-16): MV power transformer failures 2007 to 2009 We see that in fact GECOL has high MV transformer failure rates reaching 10% and 13% per annum for many years. The trend in the annually failed power transformers (Table 6-17 and Figure 6-5) does not indicate any planned improvement or attempts to reduce the failure rate. We attempt here to analyze more deeply these failure rates despite the scarcity of data. 111 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Year 30kv transformer failures 66kV transformer failures 2007 97 36 2008 113 83 2009 101 79 2011 30 12 2012 81 53 2013 92 54 2014 58 38 2015 84 34 2016 128 97 Table (6-17): Total MV power transformer failures 2007 to 2016 Figure (6-5): Total MV power transformer failures 2007 to 2016 Figure (6-6) relates transformer failures to seasons through quarterly failure data between 2007 and 2016. There is no clear correlation between seasons or climate and fault rates. There are also neither temperature rise trips nor overcurrent trips recorded for the power transformers, which would imply that the transformers are not exposed to any sustained overloading. 112 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2008 2009 2007 30 60 40 40 30 20 30kV Series1 20 30kV 10 66kV 20 Series2 10 66kV 0 0 0 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 2011 2012 2015 25 40 40 20 30 30 15 30kV 30kV 30kV 20 20 10 66kV 66kV 66kV 5 10 10 0 0 0 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 2016 2016 4 2 3 1 50 2015 4 3 1 -- 40 2012 1 4 3 2 30 30kV 2011 1 2 -- -- 20 2009 3 1 4 2 66kV 10 2008 1 3 4 2 2007 3 2 4 1 0 Q1 Q2 Q3 Q4 Figure (6-6): Quarterly MV power transformer failures 2007 to 2016 6.3.3.1 Analysis of MV transformer failures Reviewing GECOL's specification and supplier list for the power transformers revealed that the specifications are superior and the suppliers are of sound reputation. These two strong points would appear to contradict the high rates of failed transformers. However, on review of the installation and maintenance practices followed by GECOL, we find many elements that raise concern. The most important apparent malpractices are: - Transformer Oil: The specifications of the transformer oils GECOL uses are excellent. They are supplied to GECOL in drums, but are usually not treated before use. GECOL installation staff and contractors are used to directly filling the transformers with the untreated oil without drying first. The moist oil will transfer moisture to insulating papers and lead to damage of the transformers. Recorded transformer protection trips are mostly by differential protection and Buchholz protection. These normally are very selective and will only operate for internal transformer faults. GECOL appears to pay only limited attention to the transformer installation and commissioning procedures, especially those carried out by GECOL staff or its domestic contractors. An added problem is the limited number of oil treatment machines available, which is a further reason for maintenance teams to add untreated oil to transformers during maintenance works. 113 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE - Voltage Management: We note that all On-Load Tap Changers of GECOL’s power transformers are set on the manual position. This means that the medium voltage (30kV and 66kV) networks are susceptible to overvoltages, especially during off-peak times. Overvoltages greater than 110% of the rated voltage can result in over fluxing and saturation of the magnetic circuits of the transformers, and hence overheating and damage to the transformer. Although GECOL's specifications stipulate a flux density of 1.65 Tesla to protect against overvoltages, GECOL does not actually take any action to guarantee compliance of manufacturers to this requirement. This requirement can only be confirmed by the staged inspection of the magnetic circuit including magnetic steel procurement and magnetic steel shearing. 114 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 6.4 Points of concern 6.4.1 Immediate concerns  High rates of failure of MV transformers, in the range of 10% and 13% per annum over several years. This requires urgent investigation by GECOL and the causes need to be addressed.  High failure rates of 30kV cables, apparently from a multiple of factors that include bad handling of cables, incorrect bonding and earthing of cable sheaths, improper cable terminations, and solid grounding of some 30kV networks.  Solid grounding of 30kV networks, which were designed to be resistively grounded. This is causing damage to equipment not designed for the higher fault currents. Grounding resistor need to be put back in service or replaced.  Technical skills gaps of maintenance and operations personal in a number of key areas, including cable works, substation dc systems, transformer maintenance, and preventive maintenance.  Network overvoltages that are putting added stress on network equipment, in particular transformers. Control of on load tap changers (OLTC’s) should be switched to automatic operation and the automatic voltage regulators (AVR’s) in the substations allowed to do their function to maintain a stable voltage.  Imported project equipments lying in stores and subject to damage and vandalism. GECOL needs to prioritise halted MV substation, cable and overhead line projects, and possibly find innovative solutions to resolve some of the problems and obstacles to their utilization. 6.4.2 Longer term concerns  Divergence in many cases from the GECOL technical standards. GECOL should strictly enforce these standards and ensure its own staff understand and correctly apply them. This will resolve many of the problems related to failures of equipment.  Continued operation of the older switchgear (51 outdated 30/11kv substations: 21 BBC and 33 GEC), which are becoming both a hazard to personnel and the network and for which spare parts are no longer available. GECOL should prepare a comprehensive plan for the repair, rehabilitation or replacement of these equipments, as may be the more viable in each case.  Dust and pollutants accumulation on live parts and other equipment. GECOL should revise and update the substation building specification and the index of protection of the switchgear in order to provide suitable protection against dust.  Use of untreated oil. GECOL needs to provide their transformer maintenance teams with sufficient oil treatment machines to ensure the protection of power transformers oil and windings, improving performance and reducing failures.  Preventive maintenance checks are not consistently and comprehensively carried out to provide optimal lifetime enhancement of GECOL assets. 115 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE  Problems with substation Dc supply systems and batteries lead to shortened battery lives, loss of substation auxiliary supplies in a relatively short period after loss of external supplies, and early replacement of battery sets 116 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 7 Distribution 7.1 Introduction GECOL’s distribution assets include: - Ground-mounted Distribution Transformers - Pole mounted transformers - Underground 11 kV cables - Underground 0.4kV cables - Overhead 11kV lines - Overhead 0.4 kV lines - Distribution Switching substations - Distribution substations We will consider here the availability of these assets, the reasons for non-availability, fault rates, operating regimens, and recommendations for performance improvement. 7.2 Distribution asset statistics Electrification in Libya exceeds 99% of all the populated areas and the distribution grid is a major part of GECOL’s assets. The estimated MEAV (Modern Equivalent Asset Value) of GECOL ’s distribution assets is around €3.4billion. The quantities of these assets is illustrated Table (7-1). Transformers Mounted Ground Transformers Pole Mounted 11kV U/G cables 11kV O/H lines stations Switching Ring main units switchboard LV main LV cables * Total numbers or lengths 15235 53588 10821 40862 1619 11029 11029 43282 Average unit investment €10,300 €4,800 €60000 €10645 €160,000 €6363 €4500 €36000 cost Grand Total €3,435,378,917 * LV cables are estimates as 4 times 11kV cables lengths Table (7-1): Total distribution assets 7.3 Investment strategy The long-term investment proposal for the replacement of distribution assets has not been set based on any statistical models or forecasts. The investment proposals have been based on historical fault rates, lists of new connection requests and on load measurement reports. It is also very difficult to observe or determine the trends of aging of the distribution assets because of the absence of a reliable Distribution Information System (DIS). In other words, GECOL replaces distribution assets only when the asset has failed and tripped out by 117 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE protection or is noticeably being overloaded. We cover here the actual strategy for each type of asset. 7.3.1 Distribution transformers The overall condition of the transformers, determined from condition assessments and defects identified and reported from routine inspections and maintenance activities, does not lead to transformer replacement. GECOL has made an attempt to carry out a recycling plan, replacing the 500kVA overloaded transformers with the overloaded 1000kVA transformers from other locations, replacing the 1000kVA transformers with 1500kVA transformers, and exploiting the replaced 500kVA transformers for new connections. This process is known as "Transformer Rotation". Transformer rotation was unsuccessful in most cases for two main reasons. First, the overloaded transformers usually had already been exposed to high temperatures over prolonged periods, leading to increased acidity of the transformer oil and deterioration of the internal copper connections. Second, the handling during transportation of such deteriorated transformer was usually sufficient to result in the subsequent failure of the transported transformer when put in service in its new location. GECOL’s investment over the past five years (2013 to 2017) in distribution transformers has exceeded €189.1million, an amount calculated from the transformer procurement invoices for the period 2013 to 2017). This points to around 46% of GECOL’s distribution transformers are less than five years old, relatively new. Table (7-2) shows the details of transformers procured since 2013. Transformer size Quantity MEAV (€) 50KVA 6828 32,774,400 75KVA 472 2,265,600 100KVA 6417 30,801,600 200KVA 6268 30,086,400 500KVA 3118 32,115,400 1000KVA 1319 13,585,700 Package S/S 500KVA 969 27,132,000 Package S/S 1000KVA 583 20,405,000 Grand total 25974 189,166,100 Table (7-2): Distribution transformer procurements since 2013 7.3.2 Distribution cables 11kV oil impregnated cables have been targeted in the past to be replaced throughout the distribution network. However, more than 400km are still operating in the grid. Their high 118 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE failure rate, limited current carrying capacity, and the special transition joints they require were, and continue to be, the main reasons pushing for their replacement. Low voltage cables remain in service unless the cable is entirely burnt out. In actual practice, the rate at which low voltage cables are burnt out because of exposure to sustained faults or severe overloading cannot be ignored. New cables are all installed with good protective devices (MCCB with overload and short circuit protection), but the multiple trippings of overloaded cables leads, in many occasions, to the distribution technicians cancelling the protective device and connecting the cable directly to the switchboard busbar. In addition, an epidemic of thefts of station materials, including copper elements and MCCB's, were an indirect cause of damage to many low voltage cables. Since 2012 GECOL has changed its investment strategy towards aluminum conductors instead of copper to ward off some of the thefts directed at high-priced copper. GECOL also changed its insulation material specification from PVC to XLPE to compensate for the lower current carrying capacity of the aluminum cables. In parallel to this GECOL has changed the rating of the main low voltage MCCB's from 400A to 320A to further protect the aluminum cables. The investment by GECOL over the past five years (2013 to 2017) in distribution cables exceeded €93million. Table (7-3) gives the details of cables procured since 2013. Cable type Qty (km) MEAV (€) NA2XCEB2Y 3×240 R/V 8.7/15 kV 2106 € 57,891,834 NA2XY 3.5x240 SM 0.6/1 kV cable 1982 € 22,729,576 NA2XY 3.5x95 SM 0.6/1 kV cable 2533 € 12,475,025 Table (7-3): Distribution cables procured since 2013 7.3.3 Distribution substations The majority of GECOL's distribution substations are indoor, so investment costs include land and civil works. The configuration usually consists of one 11kVring main unit (RMU), one (or two) ground mounted distribution transformer(s), and one (or two) low voltage switchboard. GECOL has planned to replace all the old bulk oil RMU's and oil load break switches with modern units with vacuum circuit breakers and SF6 insulation. However, a very large number of the old RMU’s are still in operation, presenting a risk to both the network and distribution personnel. In recent years, and in consideration of the difficulties being faced in substation building construction, GECOL’s investment strategy has shifted towards package substations, with more than 1000 package substations having been procured in the last six years. This is a positive development. On the other hand, however, GECOL continues to install switching stations in contradiction to its own design standard. GECOL’s design standards recommend a simple configuration of distribution circuits. Each circuit originates from and ends at 30/11kV substation and feeds up to 8 distribution substations, with no switching stations in the ring. This scheme is reliable, flexible, cost effective, and simple to operate and maintain. 119 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Prior to this design standard, the switching stations were a mainstay of the distribution network. The network was complicated, it was difficult to coordinate the protections, and expensive to maintain or to rehabilitate the equipment. While GECOL is phasing out and replacing old switching stations with RMU’s in some locations, it continues to construct new switching stations in other locations. GECOL investment over the past five years (2013 to 2017) in distribution substations, including package substations and switching stations, has exceeded €78.5million as shown in Table (7-4). Note that a considerable part of this investment is still not delivered to GECOL. Asset Qty MEAV 12kV 630A Ring main unit with 200A T-off CB 1538 € 9,786,986 Low voltage switch board 1600A 1538 € 6,921,000 1000KVA, 11/0.4kV outdoor packaged substation, 693 € 25,147,584 500KVA, 11/0.4kV outdoor packaged substation, 483 € 13,524,000 Switching stations 145 € 23,200,000 Total 4397 € 78.579,570 Table (7-4): Distribution stations procured since 2013 7.4 Description of assets population 7.4.1 Ground mounted transformers There are 15,235 ground-mounted distribution transformers currently operating within the GECOL system, with a voltage of 11/0.4kV and power capacity ratings ranging from 500 to 1000kVA. Almost all the ground-mounted transformers are conservator type and installed indoor. The numbers of ground mounted distribution transformers per region are given in Table (7-5) and Figure (7-1). Mountain Mountain Elmergep Tarhoona Benghazi Southern Aljufara Western Western Central Zlieten Tripoli Gurian Derna Green Sahel Region No. of transformers 4328 2783 2088 1338 982 797 719 473 437 427 353 261 249 Table (7-5): Ground mounted distribution transformers by region 120 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE No. of ground mounted transformers per region 4500 4000 3500 3000 2500 2000 1500 1000 500 0 Western… Western Tripoli Elmergep Zlieten Middile Der na Sahel Aljufara Benghazi Green Mountain Southern Gurian Tarhoona Fig (7-1): Ground mounted distribution transformers by region Figure (7-1) shows that a considerable number of ground-mounted transformers are located in the coastal area and hence exposed to severe atmospheric conditions such as moisture and corrosion. 7.4.1.1 Pole mounted transformers There are 53,588 pole-mounted distribution transformers currently operating within the GECOL system, with a voltage of 11/0.4kV and power capacity ratings ranging from 50kVA to 300kVA. Almost all the newly installed pole-mounted transformers are sealed type. The numbers of pole mounted distribution transformers per region are given in Table (7-6) and Figure (7-2). Mountain Mountain Elmergep Tarhoona Benghazi Southern Aljufara Western Western Middle Zlieten Tripoli Gurian Derna Green Total Sahel Region No. of pole mounted 8198 7254 7061 4446 4369 4057 4013 3519 2978 2592 2456 2060 585 53588 Transformers Table (7-6): Pole mounted distribution transformers by region 121 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE No. of pole mounted Transformers per region 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 Fig (7-2): Pole mounted distribution transformers by region All regions have a larger number of pole mounted transformers than ground mounted, except for the Tripoli region (Figure 7-3). This type of asset is very important to GECOL and should receive adequate attention in its design, installation, operation and maintenance. 9000 8000 7000 6000 5000 4000 No. of pole mounted 3000 Transformers 2000 No. of Pad mounted 1000 Transformers 0 Figure (7-3): Comparison of ground to pole mounted transformers by region 7.4.2 Distribution substations Table (7-7) and Figure (7-4) show how the numbers of distribution substations and switching stations per region. The switching stations make up about 14% of the total. Distribution substation here includes both the indoor substation and the outdoor package substation. Tripoli city has an excessive number of switching stations because its original standard to supply important customers such as hospitals was to use a switching station and two incoming feeders to the customer with a change over facility. 122 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Mountain Mountain Tarhoona Benghazi Southern Aljufara Western Western Gharian Middle Region Tripoli Totals Green Sahel Dist. S/S 919 1521 2637 271 834 681 348 3227 211 380 11029 SW S/S 143 260 193 55 54 67 66 691 38 52 1619 Table (7-7): Distribution stations by region 3500 3000 2500 2000 1500 Dist. S/S 1000 500 SW S/S 0 Fig (7-4): Distribution stations by region 7.4.3 Distribution lines Table (7-8) and Figure (7-5) give the lengths of 11kV underground cables and overhead lines. In all regions the overhead lines constitute a major part of the distribution network and should receive adequate concern in their design, installation, operation and maintenance Western Mountain Green Mountain Sahel Aljufara Tarhoona Benghazi Southern Western Middle Region Tripoli Gurian U/G cables [km] 896 1395 2336 87.8 625 1301 169 3446 122 442.4 O/H lines [km] 4735 5990 7326 3277 3531 5121 1962 4674 2046 2200 Table (7-8): Distribution lines by region 123 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 8000 7000 6000 5000 4000 3000 U/G cables [km] 2000 O/H lines [km] 1000 0 Fig (7-5): Distribution lines by region 7.5 Condition of Distribution assets and their defects 7.5.1 Condition of ground mounted distribution transformers – defects and failures Assessment of the condition of a distribution transformer requires some special tests and measurements to check the condition of the solid insulating materials and the insulating oil. GECOL has a team equipped with modern testing devices like the Dissolved Gases Analyzer, but they do not have a comprehensive plan to check all the existing transformers. Instead they check newly procured transformers from different suppliers. This is because even new transformers can have a percentage of faulty units. This plan had been successful, and has forced some suppliers to acknowledge their defects. Transformer condition assessment and monitoring plans should equally focus on the existing units operating in the grid for many years. Thus, a comprehensive transformers condition monitoring and assessment in addition to the routine maintenance system should be widely implemented by GECOL’s distributed department to cater for this important component of the network which will significantly improve supply reliability and reduce technical losses at the distribution level. The statistics on failure of ground-mounted transformers in the period 2012 to 2016 are presented in Tables (7-9) to (7-13). Region No. of G.M. Tr's in service Failed G.M. Tr's Failed G.M.Tr% Tripoli 4793 73 1.52% Green Mountain 1236 18 1.46% Benghazi 2743 21 0.77% Western 1693 23 1.36% Southern 719 7 0.97% Middle 2299 26 1.13% Total 13483 162 1.20% Table (7-9): Failures of ground mounted transformers in 2012 124 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Region No. of G.M. Tr's in service Failed G.M. Tr's Failed G.M Tr% Tripoli 4980 46 0.92% Green Mountain 1236 31 2.51% Benghazi 2755 37 1.34% Western 1693 24 1.42% Southern 719 23 3.20% Middle 1623 39 2.40% Total 13006 200 1.54% Table (7-10): Failures of ground mounted transformers in 2013 Region No. of G.M. Tr's in service Failed G.M. Tr's Failed G.M Tr% Tripoli 4885 38 0.78% Green Mountain 1095 14 1.28% Benghazi 2773 58 2.09% Western 1674 25 1.49% Southern 626 14 2.24% Middle 1644 24 1.46% Total 12697 173 1.36% Table (7-11): Failures of ground mounted transformers in 2014 Region No. of G.M. Tr's in service Failed G.M. Tr's Failed G.M Tr% Tripoli 4210 84 2.00% Green Mountain 1201 36 3.00% Benghazi 2737 62 2.27% Western 1672 67 4.01% Southern 748 12 1.60% Middle 1971 37 1.88% Total 12539 298 2.38% Table (7-12): Failures of ground mounted transformers in 2015 Region No. of G.M. Tr's in service Failed G.M. Tr's Failed G.M Tr% Tripoli 3481 39 1.12% Green Mountain 1240 16 1.29% Benghazi 2737 53 1.94% Western 1797 38 2.11% Southern 748 10 1.34% Middle 3141 29 0.92% Total 13144 185 1.41% Table (7-13): Failures of ground mounted transformers in 2016 The average rate of transformer failures is 1.6% per annum, and the average number of annually failed ground-mounted transformers is 208 transformers. The trend of the annually failed ground mounted transformers (Figure 7-6 and Table 7-14) do not indicate any planned improvement efforts or attempts to reduce the failure rate, and the random increase and decrease in failure rate would point to the influence of many other 125 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE external factors other than simple aging. Those external factors may include the climatic conditions, the quality of the newly procured transformers, and other factors. Year 2012 2013 2014 2015 2016 Failed GM Tr's 162 200 149 298 185 Table (7-14): Trend in annually failed ground mounted transformers Failed ground mounted transformers 350 300 250 200 150 failed GM Tr's 100 50 0 2012 2013 2014 2015 2016 Figure (7-6): Trend in annually failed ground mounted transformers 7.5.1.1 Analysis of ground mounted transformers failures per the quarters of year An analysis of failure rates per quarter year should point to any seasonal influence on failures. We will consider the failure rates for the year of 2013 because the data for this year is readily available for all four quarters. The first quarter represents the winter season which is very cold in the Eastern region and in the Western Mountain region, the second quarter represents the spring season which is quite mild and power loading is minimal, the third quarter represents the summer season which is very hot in the Western and Southern regions and the power loading is at its peak values, and the fourth quarter represents the fall season at the end of which lightning storms are noticeable. Table (7-15) and Figure (7-7) demonstrate the rates of ground mounted transformer failures during the different seasons/quarters of 2013. 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Tripoli 14 11 8 13 Green Mountain 9 7 4 13 Benghazi 12 13 12 14 Western 7 1 9 7 Southern 6 9 6 2 Middle 7 13 13 8 Table (7-15): Quarterly ground mounted transformer failures in 2013 by region 126 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 14 12 10 1st Quarter 8 2nd Quarter 6 3rd Quarter 4 4th Quarter 2 0 Tripoli Green Benghazi Western Southern Middile Mountain Figure (7-7): Quarterly ground mounted transformer failures in 2013 by region It is clear from Figure (7-7) that there is a significantly higher rate of failures corresponding to the winter and summer seasons. This would indicate that failure rates of ground mounted transformers can be at least partly attributed to the heavy loads of heating in winter and air conditioning in summer which can often result in overloading of the transformers. The other seasons also have considerable rates of transformer failures which we cannot attribute to overloading, but there are many other factors that influence the failure rate of the transformers as noted from our discussions and site visits to GECOL sites, and which will be analyzed in the next section. 7.5.1.2 Analysis of ground mounted transformer failures  1- High Voltage bushings and cable boxes: The majority of ground-mounted transformers procured before 2007 (the year in which GECOL established the specification standard for the distribution facilities) are equipped with outdoor bushings and arcing horns and are only suitable to receive bare conductors from overhead lines. Those transformers were installed in indoor substations and connected to underground cables. The absence of a cable box leaves the energized conductive parts exposed, constituting a danger to personnel, and more than one fatal accident has been recorded. Short-circuits resulting from small animals such as rodents and cats managing to enter the substation through open doors and windows, unprotected ventilation openings, and cable trenches, and touching live parts were also the direct cause of many transformer failures. The photographs below show one example of these exposed transformer connections, and a large number of such installations still exist in all regions of Libya. 127 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Transformers procured more recently in accordance with GECOL’s new specifications are all equipped with elbow type terminals and this issue has been completely resolved. Transformers complying with the new specification procured after 2013 account for about 6000 transformer installations, i.e. about 39% of the total. However, the remaining older 61% of installed ground- mounted transformers require urgent corrective actions including removal of arcing horns, and covering the exposed conductive parts. Total installed ground mounted transformers 15235 Transformers installed since 2013 with correct specs 5989 20000 15000 10000 5000 0 Total installed pad Transformers mounted installed since 2013 transformers with correct specs Figure (7-8): Total ground mounted transformers vs transformers complying with new specifications 2- Overloaded ground mounted transformers Measurement campaigns conducted by GECOL have revealed a considerable number of overloaded transformers both in the winter and summer periods. The 2016 summer campaign revealed about 417 over loaded transformers (Table 7-16), and the 2017 winter campaign revealed 226 overloaded transformers. G.M Measured No. of transformers loaded Region transformers transformers more than 80% Tripoli 4328 5146 142 Green Mountain 1243 1215 89 Benghazi 2783 588 - Western 2497 1649 107 Southern 719 37 - Middle 3643 3101 78 Totals 15213 11736 416 Table (7-16): Results of 2016 summer measurements campaign 128 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE The main issue with the overloaded ground mounted transformers is that they are not effectively protected against overloading, and not effectively cooled. The transformers themselves are fitted with thermal protection (thermometer with electrical contacts), but these are not properly connected to the tripping device to disconnect the transformer, despite all transformer switches and breakers being fitted with trip coils prepared to receiving tripping signals from temperature rise thermometers and Buchholz relays. Further, the ventilation hatches of most transformer buildings are under-sized and don’t provide adequate natural cooling to the ground mounted transformers. Prolonged overloading of transformers adversely affects the transformer life, compounded by the poor cooling conditions and poor protection measures. The photograph below shows how the lower ventilation hatch is too small compared to the transformer size and how it is unintentionally closed. 3- Overvoltage in the network feeding the ground mounted transformers It is noted that almost all on-load tap changers of the power transformers in the GECOL network are normally set to the manual position. This means they do not automatically correct for voltage variations and therefore the 11kV network is susceptible to overvoltages during off-peak times. Table (7-17) shows a portion of voltage profile of one 11kV substation. Hour V L1-L2 V L2-L3 22:31 11700 11770 107% 23:31 11690 11750 107% 00:31 11750 11820 107% 01:31 11800 11870 108% 02:31 11890 11950 109% 03:31 11810 11870 108% 04:31 11840 11910 108% 05:31 11940 12010 109% 06:31 11730 11800 107% 07:31 11600 11670 106% 08:31 11490 11540 105% Table (7-17): Voltage profile in a part of the 11kV network The voltage rises to almost 110% of rated voltage, and this can result in over fluxing and saturation of the magnetic circuits of the transformers, and hence burning the transformer out. This can be a main cause of transformer failure in the off-peak season and especially at 129 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE hours of minimum load. 4- Poor maintenance and untreated oil additions The scarcity of oil treatment machines has forced maintenance teams to add new untreated oil to the existing transformers, allowing moisture to enter the transformer and be absorbed by the solid insulating materials, thereby damaging the transformers over time. 7.5.2 Condition of pole mounted distribution transformers – defects and failures Assessment of the condition of a pole mounted distribution transformer requires close inspection which in most cases means shutdown of the distribution line. For this reason GECOL has selected sealed type transformers as the standard option for pole mounted transformers. The statistics of failure of pole-mounted transformers over the period 2012 to 2016 is given in Tables (7-18) to (7-22). No. of pole mounted Failed pole mounted Failed pole mounted Region transformers in service transformers Transformers % Tripoli 10571 450 4.26% Green Mountain 3931 190 4.83% Benghazi 6833 122 1.79% Western 12062 614 5.09% Southern 5997 122 2.03% Middle 7428 227 3.06% Total 46822 1715 3.66% Table (7-18): Failures of pole mounted transformers in 2012 No. of pole mounted Failed pole mounted Failed pole mounted Region transformers in service transformers Transformers % Tripoli 10571 512 4.84% Green Mountain 3931 217 5.52% Benghazi 6862 300 4.37% Western 12062 771 6.39% Southern 5997 179 2.98% Middle 7428 407 5.48% Total 46851 2386 5.09% Table (7-19): Failures of pole mounted transformers in 2013 130 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE No. of pole mounted Failed pole mounted Failed pole mounted Region transformers in service transformers Transformers % Tripoli 12192 448 3.67% Green Mountain 4196 188 4.48% Benghazi 7030 219 3.12% Western 12690 614 4.84% Southern 5997 54 0.90% Middle 7254 257 3.54% Total 49359 1780 3.61% Table (7-20): Failures of pole mounted transformers in 2014 No. of pole mounted Failed pole mounted Failed pole mounted Region transformers in service transformers Transformers % Tripoli 7072 606 8.57% Green Mountain 4057 237 5.84% Benghazi 7061 231 3.27% Western 16136 968 6.00% Southern 4013 121 3.02% Middle 11623 424 3.65% Total 49962 2587 5.18% Table (7-21): Failures of pole mounted transformers in 2015 No. of pole mounted Failed pole mounted Failed pole mounted Region transformers in service transformers Transformers % Tripoli 2978 197 6.62% Green Mountain 4642 157 3.38% Benghazi 7061 221 3.13% Western 16765 913 5.45% Southern 4013 102 2.54% Middle 18129 412 2.27% Total 53588 2002 3.74% Table (7-22): Failures of pole mounted transformers in 2016 From the tables we find the average rate of transformer failures is 4.26% per annum, and the average number of annually failed pole-mounted transformers is 2094transformers. The trend of the annually failed pole mounted transformers (Figure 7-9 and Table 7-23) do not show any planned improvement efforts or attempts to reduce the failure rate, and the random increase and decrease in failure rate reflects the influence of many other factors, not just aging. Those external factors may include the climatic conditions, the quality of the newly procured transformers, and other factors. Year 2012 2013 2014 2015 2016 Failed GM Tr's 1715 2386 1780 2587 2002 Table (23): Trend in annual failures of pole mounted distribution transformers 131 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3000 2500 2000 1500 failed PM Tr's 1000 500 0 2012 2013 2014 2015 2016 Figure (7-9): Trend in annual failures of pole mounted distribution transformers 7.5.2.1 Analysis of pole mounted transformer failures per quarter year: As with the ground mounted transformer, we will analyze the failure rates of the year 2013 as the data of this year is readily available for all four quarters. Table (7-24) and Figure (7- 10) give the rates of pole mounted transformer failures during the different quarters/seasons of 2013: 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Tripoli 150 31 119 138 Green Mountain 66 52 35 74 Benghazi 95 73 59 84 Western 218 107 189 260 Southern 39 59 32 49 Middle 101 111 111 86 Table (7-24): Quarterly pole mounted transformer failures in 2013 by region 14 12 10 1st Quarter 8 2nd Quarter 6 3rd Quarter 4 4th Quarter 2 0 Tripoli Green Benghazi Western Southern Middile Mountain Figure (7-10): Quarterly pole mounted transformer failures in 2013 by region It is clear from the chart above that the fall, winter, and summer seasons have the highest failure rates of ground mounted transformers, and this is attributable to the heavy loads of heating in winter and air conditioning in summer, which results in overloading of the transformers. The fall and winter seasons are also characterized by thunder storms. Lightning is a major cause of pole mounted transformer failure. 7.5.2.2 Analysis of pole mounted transformer failure causes  1- Lightning: GECOL standards require the installation of lightning arrestors for all pole mounted 132 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE transformers, and adjustment of arcing horn gaps to 7 cm. Another measure recently taken by GECOL has been to amend the specification of the pole mounted transformers so that the BIL and the power frequency withstand voltages become 95kV and 35kV respectively, rather than the previous 70kV and 28kV. We have noted that the operation and maintenance staff behave adversely to the lightning protection measures, and tend to remove the lightning arrestors and bend away the arcing horns. The reason they give is that these devices cause the lines to trip, and when removed the line becomes stable. Of course the lightning arrestor and the arcing horn will cause the line to be tripped by the earth fault relay whenever they operate (correctly) and discharge the overvoltage to ground. That is normal, and in order to resolve the issue of the frequent tripping of the line, the solution is to install an automatic reclosing device. Removal of lightning arrestors and arcing horns causes the lightning strikes to go through the winding of the transformer and damage the insulation. 2- Overloaded pole mounted transformers GECOL’s measuring campaigns have revealed a considerable number of overloaded transformers both in winter and summer. The 2016 summer campaign revealed about 2202 over loaded transformers (Table 7-25), and the 2017 winter campaign revealed 771 overloaded transformers. P.M No. of transformers loaded Region transformers more than 80% Tripoli 2978 298 Green Mountain 4057 43 Benghazi 7061 0 Western 8198 1194 Southern 4013 3 Middle 7254 104 Western mountain 2592 10 Sahel Jufara 3519 16 Gurian 2456 57 Tarhoona 4369 246 Derna 585 70 Mergeb 4446 148 Zlieten 2060 13 Total 53588 2202 Table (7-25): Results of the 2016 summer campaign 133 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE The main issue with the overloaded pole mounted transformers is that they are not effectively protected against over load by their low voltage CB, which are generally oversized and sometimes are completely nonexistent at all. 3- Overvoltage in the network feeding the pole mounted transformers As mentioned for the ground mounted transformers, almost all on-load tap changers in the GECOL network are set on the manual position. This can subject the 11kV network to overvoltages during low load periods as previously shown in Table (7-13). As before, this can be interpreted as the cause of distribution transformer failures in off peak seasons and at hours of minimum load. 7.5.3 Condition of GECOL distribution substations and their defects 7.5.3.1 Ring main units (RMU) All GECOL distribution substations consist of 11kV RMU's, low voltage switchboards, and ground mounted transformers. Most the distribution switchgear including the RMU's were procured from top tier manufacturers in Europe. The suppliers of GECOL’s installed base of RMU's are: - Statter RMU by J.G.Statter& Co. UK - Long & Crawford UK - Brush Hawker Siddeley UK - Lucy Trident UK - Lucy Sabre UK - Siemens (8DJ20) - Schneider France (RM6) The old GECOL specifications for RMU’s state that it shall consist of two load break switches for incoming feeders and one Tee-off fused switch for the transformer. GECOL’s new specifications stipulate that the RMU’s shall be SF6 insulated instead of oil insulated, and shall consist of Tee-off circuit breaker instead of the fused switch for feeding the distribution transformer. All RMU's procured after 2008 are in accordance with the new specification. Issues with the older RMU's relate to the fuses and the insulating oil. The 11 kV fuses are somewhat expensive, and the operations staffs always complain of the lack of fuses. There is significant mismanagement of fuses such as installing smaller fuse sizes for larger transformers, thereby consumes the stock rapidly as they burn out quickly. As for the insulating oil, it gets contaminated as it extinguishes the switching arcs, and hence requires regular testing and maintenance. The oil type RMU's do not receive the proper level of maintenance and have become a source of hazard. GECOL does not have a proper DIS (Distribution Information System) with a record of which type of equipment exists 134 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE where, and thus far the asset management module in GECOL's ERP is not fully implemented. At best, we can confirm that more than 14% of the RMU's are SF6 insulated and equipped with Tee-off circuit breakers, based on the number of such RMU’s that have been procured by GECOL, with 1538 RMU's procured since 2013 to the new specifications, equivalent to 14% of the total 11029 RMU's existing in the grid. The most deteriorated and dangerous RMU's have been reported by all regional departments and are listed in Table (7-26) and total 557 units. Note that operators try to avoid operating these RMU's under voltage, so they tend to open the main feeder circuit breaker supplying the RMU from the source 30/11kV substation, cutting of supply to the full ring, and then operating the old RMU at zero voltage. Mountain Mountain Tarhoona Benghazi Southern Aljufara Western Western Middle Zlieten Tripoli Gurian Derna Green Sahel Region Deteriorated RMU's 116 85 69 7 44 57 22 31 16 59 29 22 Table (7-26): Deteriorated and old RMU’s as reported by Distribution Regions 7.5.3.1.1 Analysis of RMU failures - Concerning the old bulk types of RMU's, poor maintenance and improper oil handling have resulted in an increased number of safety accidents and equipment damages. - The large mix of RMU's from different manufacturers and different fuse types and dimensions has resulted in mismanagement of the fuse stocks, and difficulties in preparing in-time enquires for supply of fuses. This issue is only for the RMU's procured before establishing the new specifications in 2007. The photo below shows a sample of the different types of fuses used by GECOL’s old RMU’s. - Very frequent load shedding and excessive switching operations on the 11kV grid cause the fuses of RMUS's to be rapidly consumed and blown-out due to the multiple passage of inrush currents of the transformers 135 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE - Each 11kV cable ring feeds up to eight distribution substations (8 RMU's), and when one cable section is faulty, it becomes quite difficult for operation staff to fix the faulty section, and many cases they switch on to a cable fault more than once in order to identify and isolate the faulty section by trial and error. This is because GECOL erection staffs do not install the current transformers for the earth fault indicators, which come as a basic component with the RMU, and therefore have no indication of where the fault is located. CT’s of earth fault indicators were not erected, this resulted in increase of outage time, and closing on fault current many times 7.5.3.2 Low voltage switchboards GECOL uses two ratings of low voltage switchboards (LVSB), 1600A for the 1MVA transformers, and 800A for the 0.5MVA transformers. Each LVSB consists of main incoming circuit breaker (either 1600A or 800A) and four to six 400A outgoing circuit breakers (MCCB). Many of the LVSB are not in a very good state because of the modifications made by technicians to overcome overloading issues. Some breakers are jumpered and bypassed, some are entirely cancelled and the cable is connected directly to the busbars, and some are exposed to acts of theft. In any case, LVSB’s are maintainable and can be brought back to good condition. 136 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Low voltage panels are exposed to CB Over loaded cable connected to two thefts C.B's Lack of fuses resulted in replacing it with wire, Lack of fuses resulted in replacing it with wire, or connecting two conductors together or connecting two conductors together 7.5.3.3 Switching stations Switching stations in the GECOL distribution network number about 1619, constituting around 13% of all distribution substations. Table (7-27) illustrates types of existing switching stations, their age, status, advantages and disadvantages. Only the last two types of switchgear comply with safety requirements with an arc proof feature. The other types have had many incidents of breaker failures as reported by the regions in Table (28). 137 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Switchgear Installed Switchgear Advantages Disadvantages supplier type GEC [BV17] 1970– Bulk oil, Robust, reliable, Do not provide arc proof feature 1986 vertical and flexible isolation Brush Hawker 1970- Bulk oil, Robust, reliable, Do not provide arc proof feature Siddely 1986 vertical and flexible isolation ZWAR 1993- Minimum oil, - -Do not provide arc proof feature [Elektromontaz] 2000 horizontal - Complicated operation procedure isolation GEC [VMX] 1985- Vacuum, - -Do not provide arc proof feature 2000 vertical -Dust accumulates easily on live parts isolation & bushings causing flashover MEDELEC [MV12] 2000- Vacuum, - -Do not provide arc proof feature 2012 horizontal -No manual operation even in isolation emergencies - Many problems in control circuits, even the manufacturer couldn't resolve this issue Siemens 2006 Vacuum, Arc proof, Robust, - [SIMOPRIME] horizontal reliable, and isolation flexible ABB UNIGEAR 2014 Vacuum, Arc proof, and - [VD4] horizontal flexible isolation Table (7-27): Main switching stations types in GECOL network MEDELEC GEC AZWAR Switchgear type GEC (VMX) BRUSH SIEMENS others (MV12) (BV17) (Elektromontaz) Failed 359 69 106 53 40 64 46 breakers Table (7-28): Switching station circuit breaker failures 7.5.3.3.1 Analysis of faults in switching stations One of the most obvious causes of faults in switching stations is the accumulation of dust on the bushings and some of the live parts. All the switching stations are installed indoor, but at the same time the substation building are provided with large openings for transformer ventilation. The dust comes in through these hatches, finds the doors of the 11kv cubicles open (if present), and deposits on circuit breaker bushings. This causes discharges and flashovers, especially with the presence of high humidity and moisture. All sensitive mechanisms, actuators, and protective relays are also exposed to failures by this dust. The following pictures show one of the GEC VMX vacuum type switching stations. In this switching station circuit breaker chambers are not furnished with doors, and the dust caused flashover on the circuit breaker. 138 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE The picture below shows one of the ZWAR type minimum oil switching stations. In this switching station the door of circuit breaker chambers have been left open for entry of dust, moisture and vermin, potentially causing faults. Another problem with the GECOL switching stations is the frequent failures in the DC power supply feeding the control and protection systems of the substation. The DC systems in switching stations usually fails because improper commissioning of the battery chargers and charging of the station batteries, lack of experience on how to calibrate the charging voltages of the battery charger and how to maintain batteries. 7.5.4 Condition of distribution lines and their defects 7.5.4.1 11 kV underground cables Other than some 400km of old oil impregnated cables, the status of the underground 11kV network may be judged as in good status. The weaknesses of GECOL in the area of underground cables laying can be summarized in the following points: 139 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE - Cables are laid directly on the ground, pulled over the ground without rollers and without tension control measures. - No proper documentation for cable route maps and joint locations - No cable route markers, despite that the GECOL design standard stipulates installation of on ground cable direction markers every 25m along the whole cable route. - Cable ends left in stores or in trenches for long time without installing cable end caps. The strong points of GECOL’s 11kV cables are the superior cable specification, cable rated voltage is 15/8.7kV, cables are armored with two galvanized steel tapes, over sheathed with fire retardant PVC jacket, and both the conductor and the metallic screens are fitted with swelling tape and swelling powder to secure longitudinal water tightness throughout the cable length. 7.5.4.2 11kV overhead lines The weaknesses of GECOL in the field of distribution overhead lines (11kV and 0.4kV) erection can be summarized in the following points: - Conductors laid on the ground first, exposed to scratches and mechanical stress - Conductors strung over the poles without using pulleys, without sag calculations, without tension control measures, and without considering the temperature at the time of stringing - Conductors are not tied well to pin isolators, very short tie wires are used in non- standard way, and in many occasions one can see conductors touching the cross- arms All of these factors contribute tithe high failure rates in both the underground cables and the overhead lines. Tables (7-29) and (7-30) and Figures (7-11) and (7-12) show the annual protection trips of distribution feeders and the rate of failure per unit length of feeders for each region. 140 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Years Region 2012 2013 2014 2015 2016 Tripoli 4833 5010 3686 6377 5219 Green mountain 1009 1107 1251 746 2103 Benghazi 566 1147 697 613 474 Western 2839 4769 3185 4583 4242 Southern 1427 1812 2226 1787 1553 Middle 3270 4544 3845 4438 5127 Total 13944 18389 14890 18544 18718 Table (7-29): Distribution line fault rates by region per year 7000 6000 5000 4000 2012 3000 2013 2000 2014 1000 2015 0 2016 Figure (7-11): Distribution line fault rates by region per year Years Region 2012 2013 2014 2015 2016 Tripoli 0.35 0.37 0.27 0.47 0.38 Green mountain 0.24 0.27 0.30 0.18 0.51 Benghazi 0.06 0.12 0.07 0.06 0.05 Western 0.27 0.46 0.31 0.44 0.41 Southern 0.22 0.28 0.35 0.28 0.24 Middle 0.44 0.62 0.52 0.60 0.69 Total 0.27 0.36 0.29 0.36 0.36 Table (7-30): Distribution line fault rates per km per year 141 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 0,70 0,60 0,50 0,40 2012 0,30 2013 0,20 2014 0,10 0,00 2015 2016 Figure (7-12): Distribution line fault rates per km per year 142 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 7.6 Points of concern 7.6.1 Immediate concerns  A noticeably high annual rate of distribution transformers failures. GECOL should urgently prepare comprehensive transformer condition assessment and monitoring plans in order to identify any transformers that work under sever conditions and to take necessary corrective measures and actions.  There are significant rates of fatal accidents and equipment failures due to poor enforcement of safety rules, know-how of operating personnel or lack of regular maintenance. Thus GECOL is urged to enforce safety rules, develop operator skills and implement additional and more comprehensive preventive maintenance procedures for distribution network components.  Non-utilization of some of the facilities available with ring main units (RMU’s). In particular, GECOL should ensure all the alarm and protections facilities such as earthfault indication are installed, repaired and put in service.  Direct Current (DC) systems are among the most important items in substations to ensure safe operation of the equipment and the power network. GECOL needs to urgently repair, rehabilitate or upgrade all DC systems in the sensations. GECOL should also further improve and develop the level of DC systems maintenance and include it as an integral part of substation preventive maintenance practices.  Old switchgear including RMUs pose a hazard to personnel and to the distribution network. These need to be replaced. This will also improve quality and reliability of supply to consumers. Other switchgear has also been dangerously adapted or modified and needs to be restored to its original operating condition.  An Incident Recording and Management System (IRMS) or Outage Management System (OMS) OMS tool is important for GECOL to gain a clear understanding of the dimension of the outage and supply problems it faces and to take action to control and reduce these problems, thereby improving services to its customers and accurately calculating its reliability KPIs. GECOL already has the core of such systems in the Distribution Control Centers’ DMS functions as wll as its IFS ERP system. Basic Excel-based data collection and analysis tools are also available to GECOL. However, before an IT based data system can be successfully implemented by GECOL it must improve its internal data collection procedures and compliance. Such improvement should start with:  Adapting a proper and unified coding system for the network assets  Redrawing the network single line diagrams with coded feeders and substations  Enforce the operation staff to work with and update the single line diagrams instead of depending on memory  All associated existing applications or tools such as the SCADA, the CSS (Customer Services System), Planning tools (NEPLAN, or PSSE), all will share the 143 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE same facility database, and same customer data base that the IRMS tool usually use, so a proper policy for data population shall be set to avoid discrepancy and missing data. Success and proper functioning of these tools will guarantee the success and proper functioning of the IRMS  Proper implementation and adherence to all operation and maintenance standards requires a comprehensive review to the standard, fix all ambiguities, and directive training to all related staff 7.6.2 Longer term concerns  Deficiencies in asset management. GECOL needs to update the existing assets management systems including: IFS plant maintenance, GIS (geographic information systems), DMS (distribution management systems). This will enable operation and maintenance teams to manage the network as per the best practices and to improve the quality of the services provided to GECOL’s customers.  Large numbers of defective transformers. GECOL should consider setting up 2 to 3 transformer repair workshops to provide a proper venue for repairing the build up of faulty distribution transformers accumulated over the years, and also to develop necessary expertise for transformer maintenance.  Voltage drops on long rural lines and service to remote areas. GECOL should move towards Aluminium Bundled Cables (ABC) in both LV and HV rural distribution. The ABC are inherently of a lower reactance than traditional O/H lines, and much cheaper, in addition to the great advantage that allows to install up to 4 circuits of ABC on the same support. This means the line is easily upgradable when there is a need to relieve over load or to reduce voltage drop.  Technical skills gaps of maintenance and operations personal in a number of key areas, including substation dc systems, transformer maintenance, and preventive maintenance.  Deviation from and ignorance of GECOL standards lead to damage to systems, and sub-optimal installations. Understanding of the GECOL standards need to be increased and implementation enforced. 144 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 8 MV and Distribution action plan Because of many similarities in the points of concern between the MV and Distribution units of GECOL, a unified action plan has been drawn up. 145 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1. Deficient asset installation and maintenance practices Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Procure the proper tools and equipment for handling 01/01/2018 6 months cables Train and direct GECOL storekeepers on proper All storekeepers trained 01/01/2018 6 months handling and storage of power cables and certified Improve cable handling Train GECOL staff on correct handling and laying of All cable jointists trained and laying practices 01/01/2018 1.5 years power cables and certified Ensure contractors have sufficient experience and All project supervisors and knowledge of cable works and have the correct 01/01/2018 ongoing network contractors required equipment trained and certified Procure correct tools and equipment for cable jointing 01/01/2018 6 months works Train cable jointists and supervisors on the correct 01/01/2018 1 year jointing and termination practices Form regional teams to: - Assess existing bonding status, correct where Correct errors in cable necessary jointing and termination - Assess existing sheath earthing status, correct works where necessary 01/01/2019 1 year - Assess existing cable termination earthing, correct where necessary - Clean out cable trenches in substations of materials and objects that represent a physical and fire hazard to cables Train staff on correct settings of AVRs for Transmission and MV transformers and correct maintenance of 01/07/2018 6 months Put AVRs of transformers OLTCs with OLTCs in service Adjust settings of AVRs and test operation with OLTCs 01/07/2018 6 months Put AVRs in automatic mode 01/07/2018 6 months 146 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Review and optimize settings of off load tap changers 01/07/2018 6 months of distribution transformers Ensure all ground mounted transformers have temperature and Buchholz protection in service and 01/01/2018 1 year connected to trip coils Ensure all indoor ground mounted transformers have proper ventilation and it is kept in proper condition 01/01/2018 1 year Correct bad practices in with clear air paths installation and O&M of Install barriers and warning signs around bushings of transformers 01/01/2018 1 year indoor ground mounted transformers Ensure all pole mounted transformers have correct surge arrestors in place and in service; that arcing 01/01/2018 1 year horns are installed and adjusted to 7cm to GECOL standards Equip maintenance departments with sufficient All regions equipped with 01/01/2018 1 year numbers of oil treatment machines oil treatment machines Train staff on dangers of use of untreated oils 01/01/2018 1 year Use only treated oils in Train staff on use of oil treatment machines 01/01/2018 1 year transformers Carry out survey to determine current status of in- service transformers' oils, treat oils as necessary to 01/01/2018 1 year protect transformers Establish at least 3 transformer repair workshops Transformer repair Establish workshops to 01/01/2019 2 years 5 distributed geographically around Libya facilities established repair damaged Train GECOL staff on transformer repair, possibly in transformers 01/05/2019 11 months partnership with established transformer supplier Procure the proper tools and equipment for handling 01/07/2018 6 months and pulling of distribution line conductors Correct errors in erection Train GECOL staff on correct handling, pulling, of wood pole overhead 01/07/2018 6 months stringing, and fixing of overhead line conductors lines Train GECOL staff on the design and calculations of 01/07/2018 6 months distribution lines 147 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Ensure contractors must have sufficient experience and knowledge of overhead lines works and have the 01/07/2018 6 months correct required equipment Ensure proper seals of door and windows in 01/03/2018 2 years substations Improve protection Ensure proper operation and filtering of ventilation 01/03/2018 2 years against ingress of dust openings and pollution into Train staff to keep compartment door closed 01/03/2018 6 months substations Train staff not to leave circuit breaker trucks outside 01/03/2018 6 months their compartments Regularly maintain cleanliness of substations 01/03/2018 Ongoing Determine optimal set of preventive maintenance 01/01/2018 6 months checks for each type of asset Procure all necessary equipment for approved checks 01/05/2018 8 months Introduce a Train GECOL staff on preventive maintenance checks 01/05/2018 8 months comprehensive Include preventive maintenance checks in annual Preventive maintenance preventive maintenance 01/09/2018 4 months maintenance programs system fully implemented program Conduct an initial condition assessment campaign of key assets, especially transformers to identify any 01/09/2018 8 months existing critical issues requiring urgent action Determine substations and equipment that need to be 01/03/2018 2 months replaced Procure required replacements 01/05/2018 6 months All old minimum oil circuit Remove old equipment, install new replacements 01/11/2018 10 months Replace old equipment breakers replaced (old switchgear) Erect new substations to the minimum extent 01/11/2018 16 months necessary Carry out maintenance of old switchgear, including 01/03/2018 18 months RMU's, to contain risks until they are replaced Ensure sufficient supply of the correct fuses for old 01/03/2018 18 months 148 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE RMUs until they are replaced Determine where LV switchboards have been modified 01/01/2018 6 months or bypassed Restore LV switchboards All LV switchgear repaired to correct working Repair and restore switchboards 01/07/2018 1.5 years and maintained condition Resolve problems of feeder overloads or change rating 01/07/2018 1.5 years of MCBs used, as appropriate Form special regional teams to carry out works 01/06/2018 6 months Ensure CTs and other materials are available for each 01/06/2018 6 months Install earth fault alarm RMU and procure replacement parts if not available and indications on All RMU’s E/F alarm Carry out installation works 01/12/2018 1.5 years existing and future RMUs facilities in service Train GECOL staff on utilization and importance of the 01/12/2018 1.5 years earth fault indications Unify coding system for network assets, apply unified 01/01/2018 4 months codes to network diagrams Enforce use of updated network diagrams as an 1/5/2018 6 months essential tool by O&M staff Develop unified asset and customer database for use by relevant IT systems (SADA, GIS, CSS, NEPLAN / 1/6/2018 2 years PSS/E, IRMS / OMS) Distribution standards are Incident data collection Ensure adherence with O&M standards and updated, staff are and management procedures, review and update standards and 1/6/2018 3 years conversant with and procedures comply with the standards Incident data is comprehensive, effective Select and apply suitable incident recording and action plans are developed management tool, enforce company-wide 1/6/2019 9 months to manage and reduce implementation outages, improved customer experience 149 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 2. Delayed investment and replacement projects Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Form a task force to assess position of projects materials in stores, improve storage conditions and 01/01/2018 6 months security Find alternative solutions to resolve project obstacles Use available project (e.g. prefab substation buildings where standard 01/07/2018 1.5 years equipment over the Restart halted projects buildings were not constructed) coming 2 years 80% of halted projects Work with contractors to resume project execution 01/07/2018 1.5 years completed Train local engineers with suppliers on supervision 01/01/2018 2 years works Continue with procurement of ABC conductors for 01/01/2018 5 years Change to Aluminium new rural connections Bundled Cables (ABC) in Launch a multi-year program to replace existing 80% of LV and HV rural both LV and HV rural 01/01/2018 5 years copper conductors lines replaced by ABC distribution Salvage value of removed copper conductors 01/01/2018 5 years 150 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 3. Incorrect and unsafe O&M practices Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Establish a company-wide training program to ensure staff understand the GECOL standards and their 01/01/2019 1.5 years application Reissue the standards in a more easy to comprehend 01/07/2018 1.5 years Enforce GECOL technical graphic-cantered format and other standards Review and update the standards regularly as technologies develop and GECOL's requirements and 01/01/2019 ongoing conditions change Engage with suppliers and contractors to properly 01/01/2018 ongoing understand and comply with relevant Review and update all GECOL safety policies and procedures (SPP) and make them available in clear and 01/03/2018 10 months simple Arabic Launch comprehensive SPP safety awareness and Safety management training campaigns throughout GECOL that involve all 01/07/2018 3.5 years system successfully departments implemented Strengthen safety standards enforcement Enforce and motivate compliance with safety rules at 01/01/2018 ongoing all levels Procure and provide all require personal protective 01/01/2018 1 year equipment Rate of serious and fatal Build a safety conscious culture in GECOL ongoing accidents reduced by 90% 151 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 4. Skills shortage Est. budget Measures Activities Start date Indicative duration Milestones (USD Mn) Update GECOL jobs requirements 01/03/2018 6 months Specify core capabilities requirements 01/03/2018 6 months Develop a career training Career development development plan Develop a career development plan procedures 01/06/2018 6 months system implemented Create a platform to enhance the application of the 01/01/2019 6 months career development plan system 152 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 9 Key Performance Indicators Electricity utilities are required to continuously monitor and evaluate the operational performance (i.e. financial and technical) towards achieving the broader energy policy goals. In developing a performance monitoring framework, the first task is to identify and define the Key Performance Areas (KPAs), for which Key Performance Indicators (KPIs) need to be developed to monitor the utility company performance. With GECOL’s first strategic plan 2006-2010, the Company was introduced to key performance indicators (KPIs) as a means to measure progress in achieving GECOL’s targets and goals. At the time, GECOL also introduced an ERP system that, among other functions, would simplify the data collection and calculation of the KPIs, although uptake of the ERP system by GECOL has been slow and limited. The focus on KPIs was reinforced with the second strategic plan 2011-2015. The usefulness of KPIs in assessing how far GECOL had advanced with its first strategic plan was apparent, and GECOL worked to have all departments use KPIs to help improve their functions. The Planning General Department was given the task of overseeing and coordinating the introduction of KPIs by all departments. Each General Department was required to include in its periodical reports a Balanced Score Card which included the agreed KPIs for that department. These reports included the previous period’s KPI assessments for comparison and to evaluate the direction and degree of progress. The planning Department, together with each General Department, issued a masterlist of KPIs to be used. Since 2010/2011, most General Departments have been dutiful in assessing their KPIs and including them in all their periodic departmental reports. However, the comprehensiveness and accuracy of the data used to determine the KPI’s has sometimes been questionable. Also, we note that GECOL management has not really benefitted from the power and potential of Balanced Score Cards and KPIs to help understand where Departments were doing well and where there were problems and difficulties, and to help focus policies and actions to improve and resolve the problem areas. In the following section we look at the KPIs used by each of the core business units. 153 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 9.1 Generation KPIs The list of KPIs used by the Generation General Department are: Core business KPIs  Contribution of natural gas in energy generation (MWh / %)  Contribution of LFO in energy generation (MWh / %)  Contribution of HFO in energy generation (MWh / %)  Contribution of CC steam w/o fuel to energy generation (MWh / %)  Availability factor for generating units (%)  Thermal efficiency of generating units (%)  No of employees to generation capacity (FTE/MW) Common and administrative KPIs  Safety (accidents/period)  Technical training days to no. of employees (days/employee/period)  Administrative training days to no. of employees (days/employee/period)  Trained employees to total employees (%)  Ratio technicians to total employees (%)  Ratio engineers to total employees (%) Figures (9-1) and (9-2) provide graphical representations of Generation Department’s KPIs. Figure (9-1): % MWh generation by fuel type 154 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 70 60 50 40 Availability factor 30 Thermal efficiency 20 10 0 2012 2013 2014 2015 2016 Figure (9-2): Generation Availability and Thermal Efficiency Factors 2012 to 2016 From Figure (9-1) we note that power generation fuelled by HFO is almost constant, varying over the period from 8% to 9%. Quarterly KPI data indicates peaks a high as of 10% usually occurring in the second quarter, and minimums down to 7%, usually in the third quarter. Similarly, generation from the steam units of combined cycle plants, which do not require additional fuel to generate, has grown very slowly over the period, rising from 9% in 2012 to a peak of 11.25% in 2015 and falling to 10% in 201610. The main variation in fuel use is the balance between LFO and natural gas, as units switch from on fuel to another in accordance with natural gas availability. In Figure (9-2), a clear fall in the time availability factor of GECOL’s generation is apparent, from 62% in 2012 down to 58% in 2016. At the same time, the overall thermal efficiency of the generating units has significantly improved over the same period, from 31.7% in 2012 to 35% in 2016. This improvement is mostly due to the steam halves of combined cycle plant being put in service in Benghazi North and Misurata, but also because of the greater use of natural gas as the fuel and the overhaul and upgrade of several generating units, improving their efficiency. The number of employees to installed generating capacity has been constant over the period 2012 to 2016 at 0.4 FTE/MW. This appears to be questionable if only because of the large amount of new generation capacity that has been added between 2012 and 2016, leading to an reduction in the value of the ratio. 10 The figures in this report differ from those presented in the Task A Rapid sector Assessment because of the difference in fuel definitions. GECOL categorizes the generation from the steam turbines as a separate fuel category “without fuel”, while the Rapid Sector Assessment includes this generation under the fuel type powering the associated gas turbines. 155 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE The Generation General Department, like most other General Departments, also includes a number of non-core business KPIs in its balanced score card. These cover safety, employee training, and technical (core) vs non-technical (support) staff. We have found these KPIs reported in the quarterly reports, but not in the annual reports. This indicates that management does not see these figures as critical in assessing the department. We will not go into the details of the non-technical KPIs but will make the following basic observations:  Safety: There have been an average of 1.03 accidents per quarter between 2012 and 2015, the last year for which we have figures, and none were fatal. This equivalent to 4.1 accidents per year. With some 5000 staff, that is a rate of 0.08%. This compares favourably with US accident rates at fossil fuel generating plants in utilities with more than 1000 employees of 0.8% in 2015. However, in our interviews with power plant management there appeared to be no clear criteria of what constituted a reportable accidents. In addition, power plant management did not feel responsible for the reporting of accidents and collection of safety statistics or the investigation of accidents and determination of causes to prevent occurrence of similar accidents in the future, because that was considered the domain of another department outside generation’s control. We therefore expect that many accidents go unreported, including some that may lead to sick leave and loss of work days.  Training: There is a clear tilt in training for technical staff over that for non-technical staff. The quarterly average technical and administrative training days per employee between 2012 and 2015 are 0.025 and 0.017 days per employee per quarter respectively. More importantly, training ground to a halt in most of 2014 and 2015, and has been very weak since. In general, we find the KPI data collected by the Generation General Department to be reliable and the calculations reasonable. The calculation of employees per MW may be the exception, and needs to be investigated further. 9.1.1 Recommendations  In order to provide a more accurate picture of the contributions of the NG, LFO and HFO fuels to the energy generation mix, they should include the energy produced by the combined cycle steam units in their calculation. These steam units do not require additional fuel to generate electric energy, but they are running on the fuel power their respective gas turbine units. Thus the sum of the KPIs for NG, LFO and HFO contributions will equal 100%. Contribution of the combined cycle stem units can remain as an independent KPI to measure the contribution of these units in increasing generation efficiency.  Time availability does not represent a sufficient assessment of the utilization of GECOL’s installed generation capacity. It does not indicate whether the unit, when operating, is producing at rated capacity, or if there were constraints on its power output. We therefore suggest that Capacity Factor be added to generation’s KPIs. 156 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Capacity is a measure of the total energy produced by the unit(s) compared by how much energy it could have produced if it had been operating at nominal power output over the whole period. We also suggest that nominal capacity be the ambient temperature rating of single and combined cycle gas turbine units, and not the nameplate rating. This is a more complex calculation, but is a better representation of the performance of GECOL’ generation.  GECOL’s management must be involved in the selection and approval of each department’s KPIs, to ensure the KPIs used are accepted by them, help develop a better understanding of the position GECOL and its assets are in and identify the key areas that require corrective actions, and be a support tool in taking decisions to focus resources and efforts at improving GECOL’s functioning and solving its problems.  In several instances we have noted that target values for the KPIs appear to be set haphazardly and not subject to internal review and approval within GECOL. We suggest that each General Department’s senior management must be involved in setting and approving the target values for each KPI to ensure it serves GECOL policy goals and provides a true measure of where GECOL is and where it is trying to get to.  KPIs are best presented in a dashboard fashion, graphically showing the change in the KPI over time. The impact of KPI reporting will be greater if these graphs were included in the department periodic reports. 157 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 9.2 Transmission KPIs The list of KPIs used by the Transmission General Department are: Core business KPIs  S/S periodic maintenance  S/S predictive maintenance  OHL periodic maintenance  OHL emergency maintenance  OHL cleaning  400kV OHL maintenance  220kV OHL maintenance  Main equip. replacement  Communications network maintenance Common and administrative KPIs  Safety  Technical training days to no. of employees  Admin training days to no. of employees  Trained employees to total  Ratio technicians to total employees  Ratio engineers to total employees Figures (9-3), (9-4) and (9-5) provide graphical representations of Transmission Department’s KPIs. 80 70 60 50 40 S/S periodic maintenance 30 S/S predictive maintenance 20 10 0 2012 2013 2014 2015 2016 Figure (9-3): % execution of planned substation periodic and preventive maintenance 158 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 120 100 OHL periodic 80 maintenance 60 OHL emergency maintenance 40 OHL cleaning 20 0 2012 2013 2014 2015 2016 Figure (9-4): % execution of planned overhead line periodic maintenance and cleaning, and of unplanned emergency maintenance 140 No. 120 100 80 Main equip. replacement 60 40 20 0 2012 2013 2014 2015 2016 Figure (9-5): Numbers of main equipments replaced The Transmission General Department KPIs are focused on the maintenance activities, indicating mostly percentages of planned works completed. In Figure (9-3), data was available for predictive maintenance only for the years 2015 and 2016. Over the 2012 to 2016 period, between 55% and 75% of maintenance works have been carried, with figures for 2014 to 2016 markedly lower than for 2012 and 2013. This is mostly because of difficulties in arranging substation shutdowns. Similarly, Figure (9-4) shows that line maintenance works in the latter years have been dominated by emergency unplanned maintenance works, although line cleaning efforts picked up in 2016. The focus on emergency works are due to both difficulties in arranging shutdowns and because of the successive damages to the overhead lines due to sporadic and local fighting and vandalism in several parts of Libya. 159 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE Figure (9-5) shows the contrast in efforts to replace old and defective equipment in the transmission network in 2012, when 117 pieces of equipment were replaced, compared with the subsequent years when only some 11 to 20 items of plant were replaced each year. Data for the communications system maintenance was only provided for 2012, 2013 and 2014, the figures being 20%, 0% and 50% respectively. No works were included in 2015 and 2016 despite the extreme importance of the communications systems in maintaining a stable power network. In general, the KPI figures reflect the efforts of transmission maintenance staff to carry out their maintenance duties in the face of a difficult and unstable work environment. However, we note that the KPIs used, while assessing the progress of planned maintenance works, do not evaluate the quality and appropriateness of the maintenance works executed. Also, since percentages of planned work executed is almost never 100%, they do not shed light on whether particular assets are repeatedly not maintained year after year. We would suggest that fault statistics of the different types of transmission equipment are one suitable and important measure of the quality of the maintenance works, and should be added as an additional KPI. We would also note that no target figures are given for the various KPIs, limiting their usefulness as a guideline for the direction the Transmission General Department would to develop along. With respect to accuracy, the data used for the current KPIs is based on the reports received from the regional Maintenance Departments detailing the maintenance works carried out over the relevant period. This is relatively straightforward reporting. We therefore do not find any reason for concern about the accuracy of the KPIs except for limited periods in which some regions may not be able to issue their reports because of security related problems. With regard to the common and administrative KPIs, the Transmission General Department only began including them in its annual reports in 2014. We will not go into the details of these non-technical KPIs but will make the following basic observations:  Safety: The Transmission department has not provided any safety or accident statistics in any of it reports. This again emphasizes that the core business departments do not view safety as a prime concern or responsibility, further supported by GECOL’s having it report outside the Transmission Department channels direct to a Safety Department under Support Services.  Training: Transmission department has been providing the training data in a non- standard format that cannot be compared directly with other departments. This would point to KPIs not being properly understood by the reports’ authors. 160 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 9.2.1 Recommendations  Introduction of fault rate statistics to the Transmission KPIs. The Transmission General Department can include fault statistics for the main transmission asset groups (e.g. switchgear, transformers, overhead lines, cables, etc), but the internal departments in Transmission should breakdown these statistics according to voltage levels, ratings, geographic location, manufacturer, equipment range or type, age, etc, to provide more insights where needed on their correlation with high or low fault rates. This can help resolve problems and direct future procurements to the more reliable suppliers and equipments and away from the less reliable ones.  GECOL’s management must be involved in the selection and approval of each department’s KPIs, to ensure the KPIs used are accepted by them, help develop a better understanding of the position GECOL and its assets are in and identify the key areas that require corrective actions, and be a support tool in taking decisions to focus resources and efforts at improving GECOL’s functioning and solving its problems.  Safety needs to be a central concern at all levels and branches of the GECOL organization. The technical departments should collect and include safety related data and the accidents KPI in its reports.  In several instances we have noted that target values for the KPIs appear to be set haphazardly or not provided at all, and in general are not subject to internal review and approval within GECOL. We suggest that each General Department’s senior management must be involved in setting and approving the target values for each KPI to ensure it serves GECOL policy goals and provides a true measure of where GECOL is and where it is trying to get to.  KPIs are best presented in a dashboard fashion, graphically showing the change in the KPI over time. The impact of KPI reporting will be greater if these graphs were included in the department periodic reports. 161 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 9.3 Control KPIs The list of KPIs used by the Control General Department are: Core business KPIs  System loss( System minutes) (hours)  Time system lost at peak load (hours)  No. of frequency excursions (no.)  Operating time at freq. excursion (minutes)  Average network frequency during period (Hz)  Tie line availability (%)  Participation of imported energy (%)  Participation of leased energy (%)  Load factor (%)  Peak load (MW)  Minimum load (MW)  Interruptions index (no./100km)  Unavailability of equipment (%)  Loss of supply time (load shedding +protection) (minutes)  Reliability index (%)  Selectivity index (%)  Availability of Main Gas Plants (%)  Availability of Combined Cycle Plants (%)  Availability of Steam Plants (%)  Availability of Small Gas Plants (%)  Overall availability of generation plants (%) Common and Administrative KPIs  Safety (accidents/period)  Technical training days to no. of employees (days/employee/quarter)  Admin training days to no. of employees (days/employee/quarter)  Trained employees to total (%)  Ratio technicians to total employees (%)  Ratio engineers to total employees (%) Figures (9-6), (9-7), (9-8), (9-9), (9-10) and (9-11) provide graphical representations of a sample of the main KPIs of the Control Department. 2017 data relates to the first half of the year. Figures (9-6), (9-7) and (9-8) confirm the instability of network frequency after 2013. The network is being operated at well below nominal frequency to reduce the amount of load shedding, bringing operating frequency close to the threshold. Thus the numbers of frequency grew from 9 in 2010 to a peak of 1,175,324 in 2016. The time spent outside the acceptable frequency range grew from 690 minutes in 2010 to a peak of 52100 minute in 2015 and 50479 minutes in 2016. 162 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 1400000 1200000 1000000 800000 No. of frequency 600000 excursions 400000 200000 0 2010 2012 2013 2014 2015 2016 2017 Figure (9-6): Numbers of frequency excursions per year 60000 50000 40000 30000 Operating time at freq. excursion (minutes) 20000 10000 0 2010 2012 2013 2014 2015 2016 2017 Figure (9-7): Total accumulated duration of frequency excursions per year 50,2 50 49,8 49,6 Nominal nework frequency (Hz) 49,4 Average network freq. during 49,2 period 49 48,8 2010 2012 2013 2014 2015 2016 2017 Figure (9-8): Average network frequency over year 163 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 120 100 80 Tie line availability (%) 60 40 Participation of imported energy (%) 20 0 2010 2012 2013 2014 2015 2016 2017 Figure (9-9): Availability and participation of tie lines over year 250000 200000 150000 Loss of supply time - load shed+protection (minutes) 100000 50000 0 2010 2012 2013 2014 2015 2016 2017 Figure (9-10): Total loss of supply time over year 80 70 Availability of Main Gas Plants 60 (%) 50 Availability of Combined Cycle 40 Plants (%) 30 Availability of Steam Plants 20 (%) 10 Availability of Small Gas Plants 0 (%) 2015 2016 Figure (9-11): Availability of different types of generation over year Load shedding also had a large impact on the loss of supply time (Figure 9-10), although damages to overhead line and other network equipment also played a role. Loss of supply 164 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE grew from 2365 minutes in 2010 to a peak of 197,822 minutes in 2016, a more than 80 fold increase. Figure (9-9) shows that while tie lines with neighboring countries have been kept in service for much of the time, import from those countries has been very limited from just 0.12% of system load in 2014 to a maximum of just under 1% in 2016. Finally Figure (9-11) confirms the limited availability of the (mostly) old steam and small gas turbine units in supplying the power network and the dependence on the more reliable and newer main gas plants and combined cycle plants. Data for this availability of plants by type was only included in the Control Department’s reports for 2015 and 2016. The highest overall availability achieved in this period was 72.25% for Main Gas Plants. It can be seen that there is a large number of technical KPI’s provided by the Control Department. In fact, in various reports other KPIs have been included over limited periods. The data provided by the Control Department is the most informative to GECOL management to gain an understanding on the overall power network situation. It is therefore important for GECOL management to review the large numbers of available KPIs and determine which are the most important and influential for their decision making, and for the Control Department to ensure this data is included in all its reports. Almost all the technical KPIs provided by the Control Department relate to the power network. More information should also be included on the operation of the Control system itself, the availability and quality of data, function of the SCADA and IT systems, control over the network, etc. Finally, we note that we consider the quality and reliability of the data and KPIs issued by the Control General Department the best among all of GECOL’s business units. The information is collected first hand at the time of occurrence, and it is all centrally managed and processed within the limited confines of the Control Center, making the likelihood of errors or missing data extremely small. With regard to the non-technical KPIs, we note that:  Safety: No data is included relating to safety or accidents  Training: The figures provided for training are the highest among the core business units, although like all other departments it has been greatly reduced after 2013, where there were 20 training days/employee/year. In 2015 the figure is 3.37 and in 2016 4.18 training days/employee/year. 9.3.1 Recommendations  The large number of network related KPIs should be reviewed and rationalized to give management the best overview of the GECOL power network without 165 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE  Introduction of additional KPIs related to the functioning of the control and SCADA system to assess function of the control centers and determine corrective actions to keep the control centers in best working condition.  GECOL’s management must be involved in the selection and approval of each department’s KPIs, to ensure the KPIs used are accepted by them, help develop a better understanding of the position GECOL and its assets are in and identify the key areas that require corrective actions, and be a support tool in taking decisions to focus resources and efforts at improving GECOL’s functioning and solving its problems.  Safety needs to be a central concern at all levels and branches of the GECOL organization. The technical departments should collect and include safety related data and the accidents KPI in its reports.  In several instances we have noted that target values for the KPIs appear to be set haphazardly or not provided at all, and in general are not subject to internal review and approval within GECOL. We suggest that each General Department’s senior management must be involved in setting and approving the target values for each KPI to ensure it serves GECOL policy goals and provides a true measure of where GECOL is and where it is trying to get to.  KPIs are best presented in a dashboard fashion, graphically showing the change in the KPI over time. The impact of KPI reporting will be greater if these graphs were included in the department periodic reports. 166 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 9.4 Medium Voltage KPIs The list of KPIs used by the Medium Voltage General Department are: Core business KPIs  Operation cost (LYD/100km)  Stores (stock) reserve (days)  Substation periodic maintenance (%)  Substation predictive maintenance (%)  Disruption of supply (outages) (no./100km)  Maintenance of communications and auxiliary supply systems (%)  Replacement of main equipment (%)  New projects energized (substation and lines) (number) The Medium Voltage General Department is the only technical department not to include common and administrative KPIs in its reports. In particular, no coverage of safety or accidents is provided. The Medium Voltage Department has not been able to collect the data related to the first two KPI's, Operation costs/100km and Stock in days, and no values have been given for these KPIs. The KPIs for periodic and predictive maintenance as a percentage of the planned maintenance are always measured and reported. These KPIs do not reflect the performance, quality, or effectiveness of the maintenance, just what percentage of the planned maintenance has been carried out. There are no clear links between maintenance and outages. These KPI's are valid only for tracking the individual department activities as the size of maintenance work can range from visual inspection or dust cleaning to stringing several kilometers of conductors or overhauling of substations. The table below shows KPI values for maintenance activities carried out in 2013 to 2016. The work included is mainly inspection of HV bays with respect to planned. Corrective and repair works and battery maintenance are not included. The value of the KPI in its current state is therefore questionable. 2013 2014 2015 2016 Periodic substation maintenance 90.6% 76.5% 76.6% 81% Predictive substation maintenance 51% 68% 58.55% 63.8% The Medium Voltage Department assesses network reliability through the number of outages per 100km length of feeders. The recorded values of this KPI for the period 2013 to 2016 are as follows: 2013 2014 2015 2016 Outages /100km 2.2 1.9 12.4 12.5 167 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE This KPI combines all protection trips disregarding whether the feeder is a cable or overhead line. Of course the accepted rate of outages of an overhead line may never be accepted for underground cable. In this way, the KPI will be of limited benefit in tracking the performance of the medium voltage network. 9.4.1 Recommendations  The Medium Voltage General Department should consider including the Common and Administrative KPIs in its periodic reports, not least to allow assessment and comparison of Hr related factors. Especially important is the addition of the safety KPI.  Safety needs to be a central concern at all levels and branches of the GECOL organization. The technical departments should collect and include safety related data and the accidents KPI in its reports.  The Medium Voltage Department should consider introducing fault rate statistics to the reliability KPIs. Periodic reports can include statistics for the main Medium Voltage asset groups (e.g. switchgear, transformers, overhead lines, cables, etc), but the internal departments in Medium Voltage should breakdown these statistics according to voltage levels, ratings, geographic location, manufacturer, equipment range or type, age, etc, to provide more insights where needed on their correlation with high or low fault rates. This can help resolve problems and direct future procurements to the more reliable suppliers and equipments and away from the less reliable ones  Similarly, outage KPI can be broken down according to the type of feeder disconnected, cable or overhead line to assess function of each asset separately.  GECOL’s management must be involved in the selection and approval of each department’s KPIs, to ensure the KPIs used are accepted by the m, help develop a better understanding of the position GECOL and its assets are in and identify the key areas that require corrective actions, and be a support tool in taking decisions to focus resources and efforts at improving GECOL’s functioning and sol ving its problems.  In several instances we have noted that target values for the KPIs appear to be set haphazardly or not provided at all, and in general are not subject to internal review and approval within GECOL. We suggest that each General Department’s senior management must be involved in setting and approving the target values for each KPI to ensure it serves GECOL policy goals and provides a true measure of where GECOL is and where it is trying to get to.  KPIs are best presented in a dashboard fashion, graphically showing the change in the KPI over time. The impact of KPI reporting will be greater if these graphs were included in the department periodic reports. 168 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE 9.5 Distribution KPIs The list of KPIs used by the Distribution General Department are: Core business KPIs  SAIFI  CAIDI  Protection equipment maintenance  S/S periodic maintenance  Line periodic maintenance  Put new projects in service (lines & cables)  Put new projects in service (S/S’s) Common and administrative KPIs  Safety (accidents/period)  Technical training days to no. of employees (days/employee/quarter)  Admin training days to no. of employees (days/employee/quarter)  Trained employees to total (%)  Ratio technicians to total employees (%)  Ratio engineers to total employees (%) The Distribution General Department KPIs focus on reliability indices, SAIFI and CAIDI, and maintenance related activities. GECOL does not yet have suitable applications in place to effectively record and manage outages. GECOL consolidates reports from operation offices at each regional department from which it calculates the SAIFI and CAIDI. It is very important to know the following constraints on the calculated reliability indices before any comparisons are made:  The indices reflect only the reliability of the 11kV network. They do not include low voltage network outages  Load shedding and source side (Generation, Transmission and Medium Voltage) interruptions are excluded from calculations  The indices are calculated at each regional distribution department. Some departments include both the planned and unplanned 11kV outages, while other departments include only the non-planned outages. These limitations mean that GECOL reliability indices may be suitable for tracking the performance of each individual regional department, but cannot be benchmarked with other utilities, or even used for comparisons between GECOL departments. Main concerns include: - Disagreement as to whether to include or exclude planned outages from the calculations - Credibility of data is not very well controlled. Some regional departments attain high 169 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE reliability scores simply because not all faults and interruptions were registered The Distribution reliability KPI's in the period 2013 to 2016 are presented in the following tables and Figures (12) and (13). Year 2012 2013 2014 2015 2016 Year 2012 2013 2014 2015 2016 SAIFI 0 1.07 6.64 1.01 1.06 CAIDI 0.0 9.8 2.1 172.8 197.3 SAIFI CAIDI 10 300,0 200,0 5 100,0 0 0,0 2012 2013 2014 2015 2016 2012 2013 2014 2015 2016 Figure (9-12): SAIFI indices Figure (9-13): CAIDI indices The SAIFI scores seem to be inconsistent as the sharp increases in 2014 is met by sharp decrease in the CAIDI in the same year. In practice, this is impossible since any 11kV feeder trip will need at least one hour to isolate the faulty section and resume supply through another section of the ring circuits. To be meaningful and useful, these KPIs require a thorough investigation of the data used and unification of the calculation procedures. The maintenance related KPIs do not reflect GECOL performance nor the quality and effectiveness of the maintenance works. They simply indicate what percentage of planned works has been carried out. There are no clear links between maintenance and outages. These KPIs are valid only for tracking the individual department activities, keeping in mind that the size of a maintenance activity can range from a visual inspection or cleaning of dust and dirt, to stringing several kilometers of conductors or overhauling of substations. The table below shows the maintenance KPIs for the years 2012 to 2016. The KPIs include protective devices, which are mainly maintenance free, while the auxiliary DC supplies for those protective devises, and especially of the Nickel Cadmium batteries, is not included. This type of maintenance is the most important for protection reliability, and as the deep dive visits have indicated it is not included in the maintenance scope of work. Year 2012 2013 2014 2015 2016 Protective devices maintenance 68.50% 52.20% 50.00% 42.90% 77.90% Substation maintenance 86.80% 70.00% 51.90% 43.10% 80.70% Line maintenance 103.40% 69.70% 51.90% 37.90% 49.70% 170 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE With regard to the Common and Administrative KPIs, the Distribution General Department takes the safety KPI seriously. Accidents recorded per year are presented in the table below and Figure (9-14). Years 2012 2013 2014 2015 2016 Safety events Safety 20 25 158 76 82 200 accidents 150 100 50 0 2012 2013 2014 2015 2016 Figure (9-14): Distribution accidents per year The high accident rate in the Distribution Department is of immediate concern. It would appear that there is no follow up or investigation of these accidents to try to determine underlying causes, and thereby take corrective action to prevent recurrence, otherwise a year-on-year fall in the accident rates would be observed, rather than the rising slope. The HR training related KPIs are shown in the table below and in Figure (9-15). As with the other Core Business departments, training is focused on the technical side, but unlike the other departments, training activities have continued to grow in recent years. 2012 2013 2014 2015 2016 0,5 Technical Training 0,4 0.01 0.21 0.25 0.4 0.39 days / employee 0,3 Management Training 0,2 0 0 0.013 0.09 0.02 days / employee 0,1 Trained 0 employees/Total 0.20% 2.20% 5% 5% 4.90% 2012 2013 2014 2015 2016 employees Figure (9-15): Training KPIs We note also that in general the training KPIs assess the quantity of training provided, but not the quality, effectiveness, or impact on productivity of the relevant department. 9.5.1 Recommendations  Unify the measurement and calculations procedures used for SAIFI and CAIDI in particular, but also for all KPIs in general  GECOL’s management must be involved in the selection and approval of each department’s KPIs, to ensure the KPIs used are accepted by them, help develop a 171 TASK C – REPORT 4.2: IMPROVING GECOL TECHNICAL PERFORMANCE better understanding of the position GECOL and its assets are in and identify the key areas that require corrective actions, and be a support tool in taking decisions to focus resources and efforts at improving GECOL’s functioning and solving its problems.  In several instances we have noted that target values for the KPIs appear to be set haphazardly or not provided at all, and in general are not subject to internal review and approval within GECOL. We suggest that each General Department’s senior management must be involved in setting and approving the target values for each KPI to ensure it serves GECOL policy goals and provides a true measure of where GECOL is and where it is trying to get to.  KPIs are best presented in a dashboard fashion, graphically showing the change in the KPI over time. The impact of KPI reporting will be greater if these graphs were included in the department periodic reports. 172