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Guidelines for Life Extension of Existing HVDC Systems Working 649 Guidelines for life extension of existing HVDC systems Working Group B4.54 February 2016 GUIDELINES FOR LIFE EXTENSION OF EXISTING HVDC SYSTEMS WG B4.54 Members L.D. Recksiedler, Convenor (CA), Rajesh Suri, Secretary (IN),, Leena Abdul‐Latif (FR), Les Brand (AU), Phil Devine (UK), Malcolm Eccles (AU), Abhay Kumar (SE), Mikael O Persson (SE), Maurice Smith (SE), Stefan Frendrup Sörensen (DK), Marcio Szechtman (BR), Takehisa Sakai (JP), Rick Valiquette (CA), Andrew Williamson (ZA) Corresponding Members Hans Björklund (SE), John Chan (US), Richard Michaud (US), Predrag Milosevic (NZ), Van Nhi Nguyen (CA), Randy Wachal (CA) Copyright © 2016 “Ownership of a CIGRE publication, whether in paper form or on electronic support only infers right of use for personal purposes. Unless explicitly agreed by CIGRE in writing, total or partial reproduction of the publication and/or transfer to a third party is prohibited other than for personal use by CIGRE Individual Members or for use within CIGRE Collective Member organisations. Circulation on any intranet or other company network is forbidden for all persons. As an exception, CIGRE Collective Members only are allowed to reproduce the publication”. Disclaimer notice “CIGRE gives no warranty or assurance about the contents of this publication, nor does it accept any responsibility, as to the accuracy or exhaustiveness of the information. All implied warranties and conditions are excluded to the maximum extent permitted by law”. ISBN : 978-2-85873-352-1 Guidelines for Life Extension of Existing HVDC Systems Guidelines for Life Extension of Existing HVDC Systems WG B4-54 Table of Contents DEFINITIONS ...................................................................................................................................... 5 EXECUTIVE SUMMARY ..................................................................................................................... 6 1. Chapter 1 – General Procedure for Performing a Life Assessment ........................................... 9 1.1. Introduction ......................................................................................................................... 9 1.2. Preparation .......................................................................................................................... 9 1.3. Team ................................................................................................................................... 9 1.4. Assessment Process ......................................................................................................... 10 1.5. Deliverable ........................................................................................................................ 11 1.6. Life Assessment Timetable ............................................................................................... 11 2. Chapter 2 – Thyristor Based HVDC Systems Performance Issues ......................................... 13 2.1. Survey of availability and reliability (over all HVDC systems in the world) ........................ 13 2.2. Operating History .............................................................................................................. 14 2.3. Major equipment/system/sub-system failure/refurbishment summary .............................. 14 2.4. Alternatives and justification .............................................................................................. 15 2.5. Methods for assessing reliability, availability and maintainability of existing components 16 2.6. Basis for replacement/refurbishment of equipment ........................................................... 17 2.7. Performance after replacement and refurbishment ........................................................... 17 3. Chapter 3 – Life Assessment and Life Extension Measures of Equipment.............................. 19 3.1. DC Switchyard Equipment ................................................................................................ 20 3.2. Valves ............................................................................................................................... 32 3.3. Converter Transformers .................................................................................................... 42 3.4. DC Control and Protection ................................................................................................ 61 3.5. References: ....................................................................................................................... 79 3.6. Valve Cooling .................................................................................................................... 80 3.7. Station Auxiliary Supplies .................................................................................................. 84 3.8. Ground Electrodes and Electrode Lines (does not include sea electrodes) ..................... 85 3.9. Reliability Centered Maintenance ..................................................................................... 89 3.10. References ........................................................................................................................ 89 4. Chapter 4 – Guideline for assessing Techno-Economic Life of Major Equipment ................... 91 4.1. Operational Issues – Maintenance Cost / Management and Availability of Spares .......... 91 5. Chapter 5 – Reccomendation for Specification of Refurbishing HVDC System....................... 94 5.1. Introduction ....................................................................................................................... 94 5.2. Main Components of a Converter Station: Guideline for the Specification ....................... 94 5.3. Interfaces ........................................................................................................................ 101 Page 3 Guidelines for Life Extension of Existing HVDC Systems 5.4. Maintainability including spares requirement .................................................................. 102 5.5. Cost minimization ............................................................................................................ 103 5.6. Replacement time minimization ...................................................................................... 103 5.7. Operation outage minimization ....................................................................................... 104 6. Chapter 6 – Testing of Refurbish/Replacement Equipment ...................................................... 106 6.1. Introduction ..................................................................................................................... 106 6.2. High Voltage Equipment ................................................................................................. 106 6.3. Low Voltage Equipment .................................................................................................. 110 6.4. Auxiliaries ........................................................................................................................ 110 6.5. Fire detection .................................................................................................................. 111 6.6. Tests of the connection with the existing equipment ....................................................... 112 6.7. Example of commissioning procedures: IFA 2000 refurbishment ................................... 112 7. Chapter 7 – Environmental Issues ......................................................................................... 115 7.1. Insulating Oil ................................................................................................................... 115 7.2. Polychlorinated Biphenyl ................................................................................................. 116 7.3. Sulfur Hexafluoride Gas .................................................................................................. 117 7.4. Halon Gas ....................................................................................................................... 117 7.5. Refrigerants ..................................................................................................................... 118 7.6. Abestos .......................................................................................................................... 119 7.7. Audible Noise .................................................................................................................. 119 7.8. Electromagnetic Effects .................................................................................................. 120 7.9. Mitigation of Environmental Issues ................................................................................. 120 Chapter 8 – Regulatory Issues ...................................................................................................... 122 8.1. Renovation & Modernization ........................................................................................... 123 8.2. Conclusion ...................................................................................................................... 123 9. Chapter 9 – Techno Economics ............................................................................................. 124 9.1. Financial analysis of refurbishment options .................................................................... 124 Appendix A – Basslink Case Study ..............................................................................................
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