Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear  

作　　者：关永刚 蔡元纪 陈维江 刘卫东 李志兵 岳功昌 张俊民 

机构地区：[1]State Key Lab of Control and Simulation of Power System and Generation Equipments,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China [2]State Grid Corporation of China,Beijing 100031,China [3]China Electric Power Research Institute,Beijing 100192,China [4]School of Automation Science and Electrical Engineering,Beihang University,Beijing 100191,China

出　　处：《Plasma Science and Technology》2016年第3期247-253,共7页等离子体科学和技术（英文版）

基　　金：supported in part by National Natural Science Foundation of China(No.51277106);in part by the National Basic Research Program of China(973 Program)(No.2011CB209405)

摘　　要：Very fast transient over-voltage （VFTO）, induced by disconnector operations in gas- insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the ex- perimentai results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.Very fast transient over-voltage （VFTO）, induced by disconnector operations in gas- insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the ex- perimentai results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.

关 键 词：disconnector （DS） repeated strike process DISCHARGE statistical breakdowncharacteristics ultra-high voltage （UHV） very fast transient over-voltage （VFTO） 

分 类 号：TM564[电气工程—电器]