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Published Article / ENY-ARTICLE-2008-230

Studies of Epoxy Spacers Subjected to Internal and External Partial Discharge and SF6 Byproducts

Braun, J M (Ontario Hydro Research Division, Canada) ; Chu, F Y (Ontario Hydro Research Division, Canada) ; Tyman, A (Ontario Hydro Research Division, Canada)


Abstract: Ihe reliability of gas insulated switchgear (GIS) has generally been good. However, because of the complexities involved in servicing the enclosed components, maintenance and repair times can rapidly become a serious handicap affecting substation availability, particularly at the higher voltage levels, because of the importance of high reliability of GIS for system security at the higher voltages, there is a concern over the long term ageing characteristics of GIS. Several long term ageing mechanisms have been identified. While bulk failure by electrical treeing of solid dielectrics is a recognized ageing phenomenon, failures linked to long term ageing of spacer surfaces are also coming to the fore; however the corresponding mechanism is poorly understood. Corona discharge, exposure to corrosive SF6 decomposition by-products, and particle contamination can all contribute to the surface failure mechanism(s). The objective of the present study is to develop a better understanding of this failure mechanism, to probe the effects of localized corona discharges on filled epoxies and to characterize the early phases of the internal and external surface degradation process.

Keyword(s): partial discharges ; gas insulated switchgear
Note: Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics, Trondheim, Norway, July 3 - 6, 1989, pp. 342-346.

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Rekord stworzony 2008-12-20, ostatnia modyfikacja 2008-12-21

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