复合绝缘子芯棒EP/AlN复合材料沿面闪络及破坏机理研究OA北大核心

Epoxy resin for composite insulator rod has the advantages of high mechanical strength and good in-sulation performance,but it is easy to produce electric tracking damage under the condition of heating and tempera-ture rise,which leads to the decrease of long-term operation stability and safety of power grid.Therefore,in this paper,epoxy resin/aluminum nitride(EP/AlN)composites with different micro-nano ratios are prepared.The sur-face flashover and surface tracking resistance characteristics are tested,and the trap distribution characteristics and surface damage parameters are analyzed.The results show that with the increase of the doping ratio of nanoparticles,the charge trapping ability of surface traps decreases,the surface conductivity increases,the surface discharge process is accelerated,the flashover voltage decreases,and the single release energy decreases.Combined with the increase of thermal conductivity,the surface temperature rise of epoxy resin is effectively inhibited,and the tracking resistance of epoxy resin is improved.