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CIGRÉ Technical Brochure No. 514: Final Report of the 2004 – 2007 International Enquiry on Reliability of High Voltage Equipment, Part 6 – Gas Insulated Switchgear (GIS) Practices

In spite of the fact that GIS (Gas Insulated Switchgear) is already mature in transmission and distribution grids, there are special aspects that should be carefully addressed by the system operators and asset managers when planning and servicing their GIS installations. There are several specific GIS technology issues that differ from AIS (Air Insulated Switchgear) and must be considered during the engineering, manufacturing, erection, commissioning and operating life cycle (incl. maintenance, diagnostics, monitoring, etc.) processes. Optimal GIS operation is now a widely discussed topic and the most effective practices have been evaluated and implemented throughout the utility industry. Therefore WGA3-06 decided to extend the HV equipment service experience survey by incorporating additional questions focused on GIS maintenance and reliability, asking utilities for their experience and views in this field. The aim was to share the already learned lessons with the engineering public and to contribute to the utilities’ decision making processes. In the previous 2nd GIS experience survey conducted prior to 1995 some questions regarding GIS life expectancy, routine and major maintenance and environmental issues were also asked. The results from this 15 year old survey that focused on major maintenance allow a certain comparison between utilities’ practices then and now. The comparison is provided where possible. The present, the 3rd , GIS international survey questionnaire was circulated in 2003 and collected GIS service experience information in 2004 to 2007.

high voltage equipment; reliability; maintenance; enquiry; gas insulated switchgear; major failures; minor failures; major failure frequencies; failure characteristics

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