直流电压下气固交界面表面电荷积聚现象的实验分析  

Surface Charge Accumulation Phenomenon at the Gas-solid Interface Under DC Voltage

作　　者：王强[1] 张贵新[1] 王新新[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《高电压技术》2011年第3期594-598,共5页High Voltage Engineering

基　　金：国家重点实验室科研项目(SKLD09KZ02);国家电网公司科技项目(G71-07-004)~~

摘　　要：为了研究直流电压下气体绝缘设备中气固交界面的表面电荷积聚现象,采用电容探头法对施加了直流电压后的盆式绝缘子进行了表面电位的测量,并通过数值计算得到了不同电压幅值和电压极性下的表面电荷分布。实验结果表明,整个系统中的最大场强未达到空气的起始放电场强时,绝缘子表面没有明显的电荷积聚。而当最大场强超过空气的起始放电场强时,电荷开始大量积聚,说明绝缘子表面电荷的主要来源为气体侧放电。由于气体侧放电具有一定随机性,绝缘子表面电荷的分布很不均匀。In order to investigate the surface charge accumulation phenomenon at the gas-solid interface under DC voltage,the surface potentials of a cone-type insulator are measured using a capacitive probe after applying DC voltage to the insulator.The surface charge distributions under different voltage amplitudes and polarities are calculated.The experimental results show that surface charges do not accumulate significantly until the maximum electric field strength in the entire system reaches the initial discharge field strength,which implies the surface charges on the insulator are mainly generated by gaseous discharges.Moreover,the charge distributions are non-uniform due to the randomness of the discharges.

关 键 词：表面电荷 积聚 绝缘子 测量 直流电压 电容探头法 

分 类 号：TM855[电气工程—高电压与绝缘技术]