Requirement of ultra-high voltage GIS arrester to voltage gradient of metal-oxide varistor  

作　　者：HE JinLiang HU Jun MENG BoWen ZHANG Bo ZHU Bin CHEN ShuiMing ZENG Rong 

机构地区：[1]Sate Key Lab of Power Systems,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China [2]Xi’an Porcelain Research Institute,Xi’an 710077,China

出　　处：《Science China(Technological Sciences)》2009年第2期450-455,共6页中国科学（技术科学英文版）

基　　金：Supported by the National Nature Science Foundation of China (Grant Nos.50425721,5073001);the 11th Five-year National S&T Supporting Plan (Grant No.2006BAA02A16)

摘　　要：The surge arrester with excellent protection characteristics would decrease the overvoltage level ap- plied on the power apparatus to reduce their insulation levels and manufacturing bottleneck. The arrester for the 1000-kV ultra-high voltage ac power transmission system is designed as tank-type structure. The field-circuit combination numerical method combining the three-dimensional finite element method with circuit is proposed to analyze the potential distribution of GIS arrester. By comparing several design schemes, the most effective method to improve the potential distribution along the varistor column is to increase the voltage gradient of the ZnO varistor. Synthesizing several influential factors, the suitable voltage gradient of ZnO varistor should be controlled to 435 V/mm, and the resulted nonuniform degree of the potential distribution along the varistor column inside the GIS arrester would be controlled smaller than 10%. The result in this paper provides the fundamental technical index for the study of the high voltage gradient ZnO varistors.The surge arrester with excellent protection characteristics would decrease the overvoltage level applied on the power apparatus to reduce their insulation levels and manufacturing bottleneck. The arrester for the 1000-kV ultra-high voltage ac power transmission system is designed as tank-type structure. The field-circuit combination numerical method combining the three-dimensional finite element method with circuit is proposed to analyze the potential distribution of GIS arrester. By comparing several design schemes, the most effective method to improve the potential distribution along the varistor column is to increase the voltage gradient of the ZnO varistor. Synthesizing several influential factors, the suitable voltage gradient of ZnO varistor should be controlled to 435 V/mm, and the resulted nonuniform degree of the potential distribution along the varistor column inside the GIS arrester would be controlled smaller than 10%. The result in this paper provides the fundamental technical index for the study of the high voltage gradient ZnO varistors.

关 键 词：ultra-high VOLTAGE GIS surge ARRESTER METAL-OXIDE VARISTOR VOLTAGE gradient potential distribution field-circuit combination three-dimensional FINITE-ELEMENT method 

分 类 号：TM862[电气工程—高电压与绝缘技术]