INTERMEDIATE RESULTS FROM ON-GOING CIGRÉ ENQUIRY ON RELIABILITY OF HIGH VOLTAGE EQUIPMENT

CIGRÉ WG A3.06 is presently carrying out a worldwide enquiry of failures in service on high voltage equipment rated for voltages greater than or equal to 60 kV. The survey covers circuit breakers (only single pressure SF6 technology), disconnector switches, earthing switches, instrument transformers and GIS. The collection of information from utilities started in 2004 and will continue to the end of 2007. The paper presents intermediate equipment populations covered by the survey, and gives samples of major failure modes and causes. Preliminary trends, in relation to previous CIGRÉ surveys, are discussed.