环氧树脂非线性电导复合材料表面电荷与沿面闪络特性研究

Surface Charge and Flashover Characteristics of Epoxy Resin Non-linear Conductive Composites

针对直流气体绝缘金属封闭开关设备(GIS)盆式绝缘子表面电荷积累与沿面闪络的问题,制备了不同Si C质量分数的环氧树脂非线性电导复合材料,研究了Si C含量对Si C/环氧树脂非线性电导复合材料的体电导率、表面电荷、沿面闪络电压等相关特性的影响。结果表明:Si C质量分数大于50%的环氧树脂复合材料试样在高电场下呈现非线性电导特性。随着Si C含量和外加直流电场强度的增加,Si C/环氧树脂复合材料的表面电位增加量明显下降。Si C质量分数大于50%的环氧树脂复合材料在高电场下对其表面电荷积累具有抑制作用,减少了沿面闪络现象的发生。

Aiming at the problems of surface charge accumulation and surface flashover of DC gas insulated switchgear（GIS） basin type insulators, epoxy resin non-linear conductive composites with different mass fraction of SiC were prepared, and the effects of SiC contents on bulk conductivity, surface charge, flashover voltage, and other related characteristics of the composites were studied. The results show that the composite with more than 50% mass fraction of SiC exhibits non-linear conductivity under high electric field. With the increase of the SiC content and applied DC electric field strength, the increment of surface potential decreases obviously. The composite with more than 50% mass fraction of SiC inhibits its surface charge accumulation under high electric field, which can reduce the occurrence of surface flashover.