Gas Insulation Systems -Activities of Cigre WG 15.03

Abstract

In CIGRE there are several Working Groups, which are active in the field of gas insulated equipment for electric power supply. Two of them are dealing with the whole technology of gas insulated switchgear (GIS) (WG 23.02) and gas insulated transmission lines (GIL) (JWG 23/21/33.15) whereas WG 15.03 (Insulating Gases) is specialised on problems of gas insulation systems applied in these and further technologies. Its work bases on experience of manufacturers and utilities and results of scientific research published in relevant conferences like the International Symposium on Gaseous Dielectrics. Missing knowledge for the technologies is ascertained and necessary investigations are promoted. Of high importance is the development of commonly approved methods for testing, diagnosis and assessment of insulation condition and the expected life time. At the moment there are three running Task Forces in action - TF 15.03.07 Long Term Performance of Gas Insulated Systems This topic is of increasing interest due to the growing age of the equipment. - TF 15.03.09 Risk Assessment of defects in GIS by PD diagnostics Both topics are important for efficient maintenance procedures to ensure a sufficient reliability - TF 15.03.10 Insulation properties of N2/SF6-mixtures N2/SF6-mixtures are applied in GIL. Further work is necessary to get the same knowledge as for pure SF6. Actual problems in the past were handled in similar Task Forces. This paper presents by three examples how and which work has been done in CIGRE WG 15.03.