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PREFACE This Distribution System Capability Statement (DSCS) is provided by Muscat Electricity Distribution Company (MEDC) to fulfil its regulatory obligations under Condition number 32 of the MEDC Distribution and Supply Licence as well as the Oman Distribution Planning Code 4.4. MEDC supplies electricity to customers throughout the Muscat Governate as the owner and operator of its electricity distribution system originating from the 33kV busbars of the Oman Electricity Transmission Company (OETC) 132/33kV grid substations down to the final customer’s point of connection; which incorporates 33kV, 11kV and Low Voltage (LV) distribution system voltage levels and associated assets. The aim of this DSCS is to provide an up-to-date distribution system capability for the next three years (2021-2023) along with data to enable customers in identifying parts of the system; which offer opportunities for future connections or upgrading of existing connections to the MEDC system and where constraints currently exist or potentially could exist in future. In addition to the required data made available annually as part of DSCS; MEDC additionally has provided improved detailed system connectivity and additional technical data of assets, impact analysis of Cost Reflective Tariff (CRT) on MEDC customers and an overview of the photovoltaic (PV) system penetration in the MEDC distribution system which is gaining momentum in our licenced area as well. These additions are expected to provide customers and other stakeholders with a transparent understanding of MEDC distribution system and operational overview, sufficient technical parameters to undertake initial system capabilities assessment and the overall distribution system development. Additionally, this year the world including MEDC customers and hence its network have experienced a force-majure event triggered due to the COVID-19 pandemic which has temporarily but significantly impacted electricity demand including future growth in the MEDC licenced area. MEDC have determined this three-year plan to clarify and highlight MEDC’s key priorities over the DSCS planning period. The plan will form the basis for the company’s investments to provide economic and efficient system development along with serving to inform MEDC’s contributions to the Oman electricity sector. Eng. Ala Hassan Moosa Acting/MEDC Chief Executive Officer TABLE OF CONTENTS PREFACE 1 LIST OF TABLES 5 LIST OF FIGURES 6 LIST OF ABBREVIATIONS 7 1. INTRODUCTION 1 1.1. PURPOSE OF THE STATEMENT ............................................................................................................................ 1 1.2. STRUCTURE OF THIS DSCS .................................................................................................................................. 1 2. PLANNING PHILOSOPHIES AND PRACTICES 3 2.1. OBLIGATIONS OF THE DISTRIBUTION AND SUPPLY LICENCE (D&SL) .............................................................. 3 2.2. REQUIREMENTS OF THE DISTRIBUTION CODE................................................................................................... 4 2.3. DISTRIBUTION SYSTEM SECURITY STANDARD .................................................................................................. 4 2.4. SYSTEM VOLTAGE LEVELS AND CONFIGURATION............................................................................................. 5 2.5. FREQUENCY DEVIATIONS ..................................................................................................................................... 6 2.6. VOLTAGE WAVEFORM QUALITY ........................................................................................................................... 6 2.7. VOLTAGE FLUCTUATIONS ..................................................................................................................................... 6 2.8. AUTO-RECLOSING AND SINGLE-PHASE PROTECTION OPERATION ................................................................. 6 2.9. DESIGN FAULT LEVELS .......................................................................................................................................... 7 2.10. STANDARD EQUIPMENT SIZES ............................................................................................................................. 7 2.11. TECHNICAL STANDARDS ....................................................................................................................................... 9 2.12. SPECIFICATION OF APPARATUS AND PLANT ...................................................................................................... 9 2.13. EARTHING ............................................................................................................................................................... 9 2.14. VOLTAGE REGULATION AND CONTROL ............................................................................................................. 10 2.15. PROTECTION......................................................................................................................................................... 10 3. PLANNING DRIVERS 11 3.1. BACKGROUND ...................................................................................................................................................... 11 3.2. ZONE 1 – (THE EASTERN ZONE) ......................................................................................................................... 13 3.3. ZONE 2 - (THE CENTRAL ZONE) .......................................................................................................................... 15 3.4. ZONE 3 - (THE WESTERN ZONE) ......................................................................................................................... 18 4. MEDC DISTRIBUTION SYSTEM 21 4.1. EXISTING DISTRIBUTION SYSTEM ...................................................................................................................... 21 4.2. SYSTEM DEMAND AND LOAD DURATION ........................................................................................................... 22 4.3. COST REFLECTIVE TARIFF (CRT) ....................................................................................................................... 25 4.4. DEMAND NOT SECURED (DNS) ........................................................................................................................... 26 4.5. 11KV FEEDER LOADINGS ..................................................................................................................................... 27 4.6. SYSTEM DEMAND FORECAST ............................................................................................................................. 27 4.7. GRID SUPPLY POINTS .......................................................................................................................................... 31 4.8. DISTRIBUTION SYSTEM MODELLING AND ANALYSIS ....................................................................................... 34 MEDC Distribution System Capability Statement (2021-2023) – V2.0 4.9. CONTINUOUS IMPROVEMENT AREAS ................................................................................................................ 37 4.10. INFORMATION ON DISTRIBUTION NETWORK ASSETS ..................................................................................... 38 5. CHALLENGES AND OPPORTUNITIES WITHIN THE SYSTEM 40 5.1. NEW CONNECTION APPLICATIONS .................................................................................................................... 40 5.2. SYSTEM CONSTRAINTS AND OPPORTUNITIES ................................................................................................. 42 6. THE INVESTMENT PLAN 43 6.1. SYSTEM DEVELOPMENT PROJECTS DURING THE PERIOD 2021– 2023 ......................................................... 43 APPENDIX A: DISTRIBUTION LICENCE CONDITION 32: DSCS 49 APPENDIX B: DSSS NON-COMPLIANCES 50 APPENDIX C: LIST OF 2020 PV SOLAR APPLICATIONS 51 APPENDIX D: SYSTEM STUDY RESULTS 54 MEDC Distribution System Capability Statement (2021-2023) – V2.0 APPENDIX E: INFORMATION ON DISTRIBUTION SYSTEM ASSETS 121 APPENDIX E1 – 33KV CIRCUITS/FEEDERS DATA ...................................................................................................... 121 APPENDIX E2 – PRIMARY SUBSTATION TRANSFORMER DATA .............................................................................. 132 MEDC Distribution System Capability Statement (2021-2023) – V2.0 MEDC Distribution System Capability Statement (2021-2023) – V2.0 LIST OF TABLE S Table 1 : DSSS Classifications and Defined Restoration Times ...................................................... 4 Table 2 : System Nominal Voltages and Tolerance ......................................................................... 5 Table 3 : Short Circuit Rating of Switchgear .................................................................................... 7 Table 4 : Standard 33kV Conductor Sizes and Ratings ................................................................... 7 Table 5 : Standard 11kV Conductor Sizes and Ratings ................................................................... 7 Table 6 : Standard LV Mains Conductor Sizes and Ratings ............................................................ 8 Table 7 : Standard Switchgear Ratings ............................................................................................ 8 Table 8 : Zone 1 - Grid and Primary Substations