“…4 Repeated arc discharge contributes to the formation of a hot spot, and the high temperature leads to the thermal degradation and carbonisation of silicone rubber. 5 Consequently, tracking and erosion of silicone rubber occur, followed by insulation failure. 6 A traditional method for improving the tracking and erosion resistance of silicone rubber is incorporating inorganic llers, such as alumina trihydrate (ATH), 7,8 silica, 9-11 alumina 12 and boron nitride.…”