气固两相体放电对电力系统外绝缘的影响  

Effect on External Insulation of Electrical Power System under Gas-Solid Two-Phase Mixture Discharges

作　　者：姚文俊[1,2] 何正浩[2] 邓鹤鸣[2] 

机构地区：[1]中南民族大学电子信息工程学院,武汉430074 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2012年第2期79-84,共6页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金重点资助项目(50237010);中南民族大学中央高校基本科研业务费专项基金资助项目(CZY11003)

摘　　要：在气体中放入固体颗粒组成两相体,研究了其在不均匀电场中的导通特性,对不同气固两相体在不同介电常数和粒径条件下的雷电冲击下50%击穿电压U50进行了分析,结果表明:气固两相体放电中的U50比单纯的空气中的要低,并且在不同的极性中变化不一样,其中负极性的变化比较明显.同时也观察到不同极性下两相体放电的伏秒特性和放电发展通道,得到气固两相体50%雷电冲击击穿放电时延比单纯空气的小,尤其在高压负极性下,气固两相体的放电时延比空气的放电时延的减小可达15%,且不同气固两相体的雷电冲击放电发展通道比单纯空气的更复杂.The solid particles were put into air in the gas discharge, which consisted of gas-solid two-phase mixture and investigated by the breakdown characteristics in the non-uniform electric field. The 50 % breakdown voltages （ U50 ） of different dielectric constants and sizes under standard lightning impulse voltage were analyzed. The results showed that the Us0 was lower than that of the pure air and the variation was different as the transformation of the polarity, which was rather obvious under the negative polarity. At the same time the V-t characteristics and discharge paths were observed, and the time delay of two-phase mixture discharges was smaller than that of the pure air, which was decreased to 15 % under the negative polarity and high voltage. Those results suggest that the discharge paths are more complex under standard lightning impulse voltage.

关 键 词：两相体 放电 50%击穿电压 电场畸变 

分 类 号：TM85[电气工程—高电压与绝缘技术]