The high temperature ablation in the process of pulsed high current discharge would reduce the insulation performance of the insulation support and affect the life and efficiency of the system. To investigate the destructive effect of ablation on epoxy resin insulation, we use argon arc welding to modify the surface epoxy resin with different values of ablation current, time, distance and area so as to obtain samples with different ablation situations. The surface resistivity and surface flashover voltage of the samples are then measured. The results show that the insulation property of the epoxy resin after high temperature ablation degrades greatly. Scanning electron microscopy and energy spectrum analysis indicate that the increasing surface roughness and oxide would reduce the insulation property of epoxy resin.

epoxy resin  /  high temperature ablation  /  dielectric property  /  surface resistivity  /  surface flashover voltage