Studies of epoxy spacers subjected to internal and external partial discharge and SF/sub 6/ byproducts

Effect of physico-chemical degradation of epoxy resin on partial discharge behavior

“…One can thus question whether the products formed and the level of oxidation that was observed is representative of what transpires in cavities of smaller size. Moreover, the work reported by Braun et al [28,29] suggests that the gas composition inside occluded cavities is influenced by the level of curing agents present in the epoxy resin. They found that, although the initial gas in the cavities is air, most of the quiescent oxygen present in the gas reacts with the epoxy resin, to leave a remnant gas atmosphere that is 80 to 98% nitrogen.…”

Insulation condition monitoring of epoxy spacers in GIS using a decomposed gas CS2

“…Some researches concluded that CF 4 was a typical gas generated by partial discharge on the spacer surface. Therefore, it was possible to diagnose spacer deterioration by monitoring CF 4 [10,11], However, CF 4 is introduced into the SF 6 inevitably as impurity gas during the SF 6 production process, which may affect the accuracy of its detection [12][13]. Since then, no significant progress has been reported on the decomposition of epoxy spacer degradation in GIS.…”