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Cigré Working Group A3.06

Reliability of High Voltage Equipment

News

Survey input was closed on December 31, 2008

We Sincerely Thank the Participation of All Utilities

Date	Subject
August 2011	Final Presentation A3 Meeting	Austria
April 5 & 6 2011	WG Meeting	Basel Switzerland
January 24 & 25 2011	WG Meeting	Belfast Ireland
December 2010	Carler Sölver retired Many thanks from all for his leadership
September 2010	WG Analysis znd TB 60% complete	Stockholm Sweden
April 2010	The working group is analyzing the data that has been collected, it represents the largest reliability survey of High Voltage Equipment. The analysis includes: Disconnectors and Earthing Switches Instrument Transformer SF6 Circuit Breaker GIS (CB-Bay-Years)	Years of Service 935.200 1.300.000 281.090 88.948
August 2009	Use of Data from Cigré High Voltage Equipment Reliability Survey Cigré Southern Africa Regional Conference	South Africa
March 2009	WG met in Dresden Germany
January 2009	Survey is closed-WG is compiling results
December 2008	Last Survey Responses Accepted
November 2008	Tutorial course on Reliability of HV Equipment“ in Soul Korea organized by the Korean SC A3 committee. Presentations given by WG A3.06: Maintenance Optimization Use of Data Monitoring Circuit Breakers Disconnectors and Earthing Switches Instrument Transformers GIS Statistical Organization and Structure	Seoul Korea
August 2008	Working group will make a presentation at the next Paris session titled: *Influence of age an the reliability of high voltage equipment*	Cigré Paris
January 2008	Circuit Breaker service years contained in survey: Disconnector and Earthing Switches service years contained in survey: Instrument Transformer service years contained in survey: Utilities participating in GIS Maintenance Survey:	122,650 >500,000 >600,000 53
October 2007	Circuit Breaker Failures Reported Disconnect/Earthing Switch Failures Reported Instrument Transformer Failures Reported GIS Failures Reported	2,383 2,860 1,446 223
May 2007	Intermediate results from on-going Cigré enquiry on reliability of high voltage equipment presented at a Colloquium in Rio de Janeiro .
October 2006	The WG is preparing for analysis of data, and reporting of results for the first two years of the study, i.e. 2004-2005. Deadline for population and failure data to be included in this “mid term“ reporting is November 1 2006 Reporting from this “mid term” analysis of data is planned for the middle of 2007
August 2006	At present the population covered (for 2004) is around 42.000 circuit breakers 220.000 disconnectors and earthing switches 230.000 instrument transformers 15.000 GIS circuit breaker bays This makes the ongoing survey the largest ever. However, participation is uneven and data from more countries are solicited.
June 2006	Tutorial course on Reliability of HV Equipment“ in Rio de Janeiro organized by the Brazilian SC A3 committee. Presentations given by WG A3.06: Maintenance Theory Past CIGRÉ surveys on reliability of HV equipment Structure of present survey Preliminary results: Circuit breakers Preliminary results: Disconnectors and earthing switches Preliminary results: Instrument transformers Preliminary results: Gas insulated substations
September 2005	Participating Countries: Australia Austria Czech Republic Croatia Finland Germany Hungry India Ireland Latvia Netherlands Norway Portugal Romania South Africa Sweden Yugoslavia United Kingdom United States
September 2005	Circuit Breaker Failures Reported Disconnect/Earthing Switch Failures Reported Instrument Transformer Failures Reported GIS Failures Reported	587 715 369 47
September 2005	Revision 8 Survey Released
September 2005	Presentation of initial 2004 findings at Colloquium in Tokyo
July 2004	Detailed WG A3.06 information available on the Web
April 2004	"official" start of the survey Final versions of all documents for the questionnaire were launched. The survey tool is available in 10 languages.

Revised 22-January- 2011