Flashover Voltage of Epoxy/Al2O3/ZnO Composites in Liquid Nitrogen

Epoxy resin as an insulation material plays an important role in superconducting system owing to its excellent insulation properties under low temperature. The flashover at the solid-liquid interface is the main dielectric failure in liquid nitrogen. In this paper, epoxy/Al2O3/ZnO composites with different ZnO contents were prepared and the surface flashover test was operated. Results indicate that the addition of ZnO particles can enhance conductivity and inhibit charges accumulation, which increases flashover voltage at solid-liquid interface obviously.