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TB 617 2015 HVDC LCC Converter Transformers - CONVERTER TRANSFORMER FAILURE SURVEY RESULTS FROM 2003 TO 2012

Every year, the Advisory Group AG B4-04 collects information on the performance of HVDC systems around the world. Over the last 20 years this data has shown that converter transformers in Line Commutated Converter systems are the single largest contributors to the forced energy unavailability. In order to provide more detailed information on the transformer failures, AG B4-04 also conducts survey on transformer failures every two years. The results of the surveys conducted on failures from 2003 to 2012 are described in this brochure.

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TABLE OF CONTENTS
Summary
1. Introduction
2. Failure Surveys
      2.1 Failure Definitions
      2.2 Failure Categories and Causes
3. JTF 12/14.10-01 Failure Survey (1972-1990)
4. JTF B4.04/A2-1 Failure Survey (1991-2002)
5. 2005 Failure Survey (2003-2004)
      5.1 Failure Descriptions
6. 2007 Failure Survey (2005-2006)
      6.1 Failure Descriptions
7. 2009 Failure Survey (2007-2008)
      7.1 Failure Descriptions
8. 2011 Failure Survey (2009-20010)
      8.1 Failure Descriptions
9. 2013 Failure Survey (2011-2012)
      9.1 Failure Descriptions
10. Failure Survey Discussion
      10.1 Introduction
      10.2 Failure Rate by Survey Reports
      10.3 Failure Rate by Year of Commissioning
      10.4 Failure Rate by Configuration
      10.5 Failures by Component
      10.6 Failures by Cause
      10.7 Failures by Transformer MVA Rating
11. Acknowledgment
12. References
Appendix A – Questionnaire on Performance of Thyristor Valve Converter Transformers
Appendix B – Converter Transformer Failure Data for Years 2003 and 2004
Appendix C – Converter Transformer Failure Data for Years 2005 and 2006
Appendix D – Converter Transformer Failure Data for Years 2007 and 2008
Appendix E – Converter Transformer Failure Data For Years 2009 and 2010
Appendix F – Converter Transformer Failure Data For Years 2011 and 2012