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TB 649 2016 GUIDELINES FOR LIFE EXTENSION OF EXISTING HVDC SYSTEMS

HVDC systems have been in commercial use since 1954, and most of them are still in operation. Renovation, modernization and life extension of HVDC stations have to be considered by utilities and grid operators, as they are usually the most cost effective options for maintaining continuity and reliability of the power supply to the consumers. This BT provides guidelines for making the technical and economic decision on life extension of existing HVDC stations against replacement.

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TABLE OF CONTENTS

DEFINITIONS

EXECUTIVE SUMMARY

1. Chapter 1 – General Procedure for Performing a Life Assessment

   1.1. Introduction

   1.2. Preparation

   1.3. Team

   1.4. Assessment Process

   1.5. Deliverable

   1.6. Life Assessment Timetable

2. Chapter 2 – Thyristor Based HVDC Systems Performance Issues

   2.1. Survey of availability and reliability (over all HVDC systems in the world)

   2.2. Operating History

   2.3. Major equipment/system/sub-system failure/refurbishment summary

   2.4. Alternatives and justification

   2.5. Methods for assessing reliability, availability and maintainability of existing components

   2.6. Basis for replacement/refurbishment of equipment

   2.7. Performance after replacement and refurbishment

3. Chapter 3 – Life Assessment and Life Extension Measures of Equipment

   3.1. DC Switchyard Equipment

   3.2. Valves

   3.3. Converter Transformers

   3.4. DC Control and Protection

   3.5. References:

   3.6. Valve Cooling

   3.7. Station Auxiliary Supplies

   3.8. Ground Electrodes and Electrode Lines (does not include sea electrodes)

   3.9. Reliability Centered Maintenance

   3.10. References

4. Chapter 4 – Guideline for assessing Techno-Economic Life of Major Equipment

   4.1. Operational Issues – Maintenance Cost / Management and Availability of Spares

5. Chapter 5 – Reccomendation for Specification of Refurbishing HVDC System

   5.1. Introduction

   5.2. Main Components of a Converter Station: Guideline for the Specification

   5.3. Interfaces

   5.4. Maintainability including spares requirement

   5.5. Cost minimization

   5.6. Replacement time minimization

   5.7. Operation outage minimization

6. Chapter 6 – Testing of Refurbish/Replacement Equipment

   6.1. Introduction

   6.2. High Voltage Equipment

   6.3. Low Voltage Equipment

   6.4. Auxiliaries

   6.5. Fire detection

   6.6. Tests of the connection with the existing equipment

   6.7. Example of commissioning procedures: IFA 2000 refurbishment

7. Chapter 7 – Environmental Issues

   7.1. Insulating Oil

   7.2. Polychlorinated Biphenyl

   7.3. Sulfur Hexafluoride Gas

   7.4. Halon Gas

   7.5. Refrigerants

   7.6. Abestos

   7.7. Audible Noise

   7.8. Electromagnetic Effects

   7.9. Mitigation of Environmental Issues

8. Chapter 8 – Regulatory Issues

   8.1. Renovation & Modernization

   8.2. Conclusion

9. Chapter 9 – Techno Economics

   9.1. Financial analysis of refurbishment options

Appendix A – Basslink Case Study