DC surface flashover characteristics of ZnO/Epoxy composites at room temperature and 77 K

Abstract

Epoxy (EP) resin based nano-composites are widely used in high voltage direct current (HVDC) high temperature superconducting (HTS) power cable. In this paper, the DC surface flashover characteristics of ZnO/EP composites were studied at both room temperature and 77 K. The samples were made by dispersing ZnO nano-particles into EP resin with various weight percentages of 0%, 1%, 3%, 6% and 10%, respectively. The experiments were carried out with a cryogenic system in which DC high voltages ranging from 0 kV to 100 kV were supplied. The results showed that the surface flashover voltages increased with the increase of ZnO content at both room temperature and 77 K, and the surface flashover voltages at 77 K were higher than that at room temperature for composites with the same ZnO content.

Study on surface discharge of nonlinear conductive epoxy resin/SrTiO3 composites in 80–300 K temperature zone

“…The flashover voltage on the surface of the specimens in a liquid nitrogen environment was significantly enhanced due to the charge movement being hindered by the nanoparticles [18]. Zhang et al investigated the effect of doped ZnO nanoparticles on the flashover voltage of epoxy resins at 77 K. It was found that the modulation of the trap distribution by nanoparticles at cryogenic temperatures could increase the flashover voltage [19]. Lee et al compared the effects of nano TiO 2 and nano Al 2 O 3 on the surface insulation properties of epoxy resins in a 77 K environment.…”

“…Zhang et al. investigated the effect of doped ZnO nanoparticles on the flashover voltage of epoxy resins at 77 K. It was found that the modulation of the trap distribution by nanoparticles at cryogenic temperatures could increase the flashover voltage [19]. Lee et al.…”