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Surface charge accumulation and preflashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage

查看全文 作　　者：Li [1]Xing;Liu [1]Weidong;Xu [2]Yuan;Chen [3]Weijiang;Bi [2]Jiangang 高影响力作者 机构地区：[1]Department of Electrical Engineering,Tsinghua University,No.1,Qinghuayuan Road,Haidian District,Beijing,People's Republic of China;[2]China Electric Power Research Institute,No.15,Qinghe Xiaoying East Road,Haidian District,People's Republic of China;[3]State Grid Corporation of China,No.86,West Chang'an Avenue,Xicheng District,Beijing,People's Republic of China高影响力机构 出　　处：《High Voltage》索引2020年第5卷第2期,共9页高影响力期刊 基　　金：the National Basic Research Program of China(Program,2017YFB0903800);the appendant project(SGTYHT/16-JS-198). 摘　　要：With the increase in the voltage and capacitance of gas-insulated transmission lines(GILs),the insulation failure of GIL has attracted more and more attention.Further understanding of the partial discharge(PD)and flashover characteristics of metal particles on the insulator surface,as well as the flashover mechanism,is necessary to reduce the failure rate and improve the reliability of the equipment.In this study,an ultra-high voltage(UHV)AC insulator PD test and measurement system based on the cross-reference pulse current(PC)and ultra-high frequency(UHF)methods were established.The PD development and flashover characteristics of 5 mm-long metal particles at different positions on the surface of a UHV AC insulator,as well as the surface charge accumulation,were studied.The results show that the discharge of millimetre-scale metal particles on the insulator surface under PD test conditions is relatively low(generally lower than 2PC),and it is difficult to be detected by the conventional PC and UHF methods due to their insufficient sensitivity.Moreover,it is found that the weak PDs of the millimetrescale metal particles will result in a charge accumulation on the insulator surface under AC voltage,which eventually will lead to the insulator flashover.The PDs of the UHV AC insulator before flashover are generally small,which will make it difficult for online monitoring systems to give an effective alarm before flashover. 关 键 词：FLASH INSULATOR CHARGE
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