小间隙高电场下温度对环氧树脂绝缘特性的影响

Insulation Property of Epoxy Resin with Small Insulating Gap under High Temperature and High Electric Field

为研究直流高电场与温度对环氧树脂绝缘特性的影响,采用正直流电源测量了不同绝缘间隙与温度下环氧基板的放电起始电压,并结合二维电场有限元仿真计算分析了不同温度与电场下的电场分布与场强。研究结果表明:温度升高与绝缘间隙增大均降低了放电起始电压与场强;温度的升高未改变电场分布,但增强了断面电场强度;绝缘间隙的增大导致断面电场分布向电极侧集中,同时增强了电场强度较易引发放电。

In this paper,eepoxy resin with small insulating gap is applied to investigate the influence of temperature onthe discharge inception electric field under high electric field. The finite element analysis of electric field is employedto analyze the electric field distribution and strength under different temperatures and different insulating gaps. Thestudy demonstrates that the discharge inception electric field decreases with increasing the temperature and increasingthe insulating gap;the electric field distribution on the surface is not influenced by the temperature and the insulatinggap;the electric field distribution in the section is not influenced by the temperature,but centralized with increasingthe insulating gap;the electric field strength in the surface and section increase with increasing the insulating gap;theelectric field strength on the surface is hardly influenced by the increasing temperature,but the electric field strength inthe section increases with increasing the temperature. With the increase of temperature and insulating gap,the electricfield strength of epoxy resin will be much higher. It will be much easier to discharge,and reduce the discharge incep-tion electric field.