固体绝缘材料内部气隙中表面残余电荷对局部放电起始位置的影响  

Influence of Surface Residual Charges on PD Inception Location within Cavity Embedded in Solid Dielectrics

作　　者：何平 何若冰 陈佳[2] 杨旭[2] 周思远[3] HE Ping;HE Ruobing;CHEN Jia;YANG Xu;ZHOU Siyuan(Yangjiang Power Supply Bureau of Guangdong Grid Co.,Ltd.,Yangjiang 529500,China;State Grid Power Research Institute,Wuhan NARI Company,Wuhan 430074,China;School of Electrical Engineering and Autoination,Wuhan University,Wuhan 430072,China)

机构地区：[1]广东电网有限责任公司阳江供电局,广东阳江529500 [2]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430074 [3]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《电器与能效管理技术》2020年第12期7-13,34,共8页Electrical & Energy Management Technology

基　　金：广东电网有限责任公司科技项目资助(031700KK52170017)。

摘　　要：为了弄清局部放电产生的表面残余电荷对放电特性的影响,搭建了表面电荷局部放电联合测试系统,研究了气隙在电极表面和介质内部两种情况下,局部放电序列中放电位置的变化。随着电压周期增大,电压极性反转前后异极性放电位置重合率不断减小。在某一电压周期下,绝缘内部气隙中的异极性放电位置重合率始终比电极表面气隙中的高。电极表面气隙中前半周期有负电荷积累的异极性放电位置重合率要高于在前半周期有正电荷积累的情形,而绝缘内部气隙中这两种情形下的异极性放电位置重合率近似相等。研究表明残余电荷会从改变电场和提供自由电子两方面对局部放电起始位置产生影响。In order to clarify the effect of surface residual charge caused by partial discharge(PD)on the discharge characteristics,a surface charge-PD joint test system is utilized to focus on the variation of the discharge position in the PD sequence of the air gap on the electrode surface and inside the medium.As the voltage period increases,the coincidence rate of the opposite polarity discharges positions before/after the voltage polarity reversal decreases continuously.Under the same voltage period,the coincidence rate of the positions of the opposite polarity discharges in the air gap inside the insulation is always higher than in the air gap on the electrode surface.The coincidence rate of opposite-polarity discharge positions with negative charge accumulation in the first half period of the electrode surface air gap is higher than in the case of positive charge accumulation during the first half period,and the opposite-polarity discharge position coincidence rate in the two cases in the internal air gap in the insulation are approximately equal.It is shown that the residual charge has an effect on the initial position of partial discharge from changing the electric field and providing free electrons.

关 键 词：局部放电 表面电荷 放电位置 气隙 固体电介质 

分 类 号：TM855[电气工程—高电压与绝缘技术]