Onset electric field of soil ionisation around grounding electrode under lightning  

作　　者：Bo Zhang Zhizhong Li Sen Wang 

机构地区：[1]State Key Lab of Power System,Department of Electrical Engineering,Tsinghua University,Beijing,People's Republic of China [2]Shaanxi Electric Power Research Institute,Xian,People's Republic of China

出　　处：《High Voltage》2020年第5期614-619,共6页高电压（英文）

基　　金：supported in part by the National Key R&D Program of China under grant 2018YFC0809400;the National Natural Science Foundation of China under grant U1866212.

摘　　要：Onset electric field of soil ionisation is one of the basic parameters to analyse the lightning impulse performance of a grounding electrode,which has been fully investigated based on experiments on hemispherical electrode or rod-to-rod gap.Until now,there has been lack of onset electric field of rod-to-plane gap,which is the real situation for grounding electrode.In this study,the soil ionisation around the grounding electrode is studied by experiment.Method to judge the start of ionisation is discussed.Both the effect of the soil resistivity and that of the radius of the grounding electrode on the onset electric field of soil ionisation are investigated.It shows that the onset electric field decreases as the radius of the electrode increases,while increases as the soil resistivity increases.A formula to predict the onset field with respect to soil resistivity and the radius of the grounding electrode is proposed.

关 键 词：experiment. ELECTRODE RESISTIVITY 

分 类 号：TM862[电气工程—高电压与绝缘技术]