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Final Report of the 2004 – 2007 International Enquiry on Reliability of High Voltage Equipment

Accurate information about the service experience of high voltage equipment is of significant value to both electric utilities and equipment manufacturers. It helps the manufacturers improve their products and provides important knowledge for the utilities when buying equipment, organizing maintenance and benchmarking their performance. Equipment reliability data is also required when assessing the overall reliability of an electric power system, including studies into the security of supply. Furthermore, international standards applicable to high voltage equipment are improved on the basis of service experience and reliability data. CIGRÉ considers collecting, analyzing and publishing reliability data to be important tasks and in 2002, WG A3.06 “Reliability of High Voltage Equipment” was established. The WG was required to organize and carry out a worldwide enquiry into the service experience of circuit breakers, disconnectors, earthing switches, instrument transformers and gas insulated switchgear (GIS). The time period covered by the survey is 2004 - 2007 and the enquiry comprises equipment rated for voltages greater than or equal to 60 kV. For circuit breakers, only single pressure SF6 technology is included and therefore, in practice equipment installed before around 1970 has been excluded. For disconnectors, earthing switches and instrument transformers there are no limitations in age or technology. Both equipment installed in air insulated and gas insulated substations are covered. Information has been collected by asking utilities to complete and return questionnaires ; 90 utilities from 30 countries have contributed. The results of the survey are presented and discussed in six Technical Brochures.

high voltage equipment; reliability; maintenance; enquiry; circuit breakers; disconnectors; earthing switches; instrument transformers; gas insulated switchgear; major failures; minor failures; major failure frequencies; failure characteristics

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