Epoxy Resin for GIS Disc-Type Insulator

Epoxy resin is widely used in disc-type spacers of gas insulated switchgear (GIS), such as disc-type insulator, post insulator and so on. While surface flashover related to the existence of surface charge and tracking failure often occur on the spacer, which is a great threat to the application of GIS and the safety of entire grid. This chapter presents a study aimed at clarifying surface charge behaviors, surface flashover and tracking resistance of EX and EX/ Al2O3 composites. It is indicated that surface charge behaviors of EX charged by AC and positive pulse voltage are totally different from that charged by AC and negative pulse. And it can be concluded that the characteristics of surface charge behaviors are changed by adding nanoparticles. With increasing the filler content from 0 to 5 wt%, the relative discharge intensity, weight loss and pattern area of the specimens decrease, the last time of the tracking process increases.