一字型接地体冲击散流机理研究  

Mechanism of Impulse Current Dispersion of Straight Grounding Electrode

作　　者：李伟 李志忠 雷蕾 王西香 赵磊 尚茜茜 张晓栋 王旭明 LI Wei;LI Zhizhong;LEI Lei;WANG Xixiang;ZHAO Lei;SHANG Xixi;ZHANG Xiaodong;WANG Xuming(Shaanxi Electric Power Research Institute of State Grid,Xi'an 710100,China;Chengnan Power Supply Branch of State Grid Tianjin Electric Power Company,Tianjin 300000,China;Shaanxi Lufeng Electric Power Engineering Co.,Ltd.,Xi'an 710000,China;Yuncheng Power Supply Company of State Grid Shanxi Electric Power Company,Yuncheng 044000,China)

机构地区：[1]国网陕西省电力公司电力科学研究院,西安710100 [2]国网天津市电力公司城南供电分公司,天津300000 [3]陕西路峰电力工程有限公司,西安710000 [4]国网山西省电力公司运城供电公司,山西运城044000

出　　处：《电瓷避雷器》2023年第3期91-98,共8页Insulators and Surge Arresters

基　　金：国家重点研发计划(编号:2018YFC0809400);国网陕西省电力公司科技项目(编号:5226KY19004F)。

摘　　要：为了研究接地体在遭受雷电流时的暂态散流规律,以一字型接地体为例进行了现场的冲击注流试验,选择不同幅值的冲击电流注入5 m长度铜覆扁钢的端部和中心,以及不同幅值的冲击电流注入5 m长度不锈钢包钢圆钢的端部,以总结一字型接地体在遭受冲击电流注入时的冲击散流规律。试验推理出土壤火花放电效应在一字型接地体散流时明显存在,并且接地体在散流时呈现出明显的端部效应,当端部注流时,首端和末端的散流比例高于中间导体约5%~15%,端部注流时的冲击电阻值比中心注流时大15%~25%,试验数据可以为复杂结构接地体的选材和设计提供参考,对于线路防雷中接地体的研究具有启示意义。In order to study the transient current dispersion of the grounding body under lightning current,a one-line grounding body is taken as an example to conduct the field impact injection test.The different amplitude of the impact current is injected into the end and center of the copper clad flat steel with a length of 5 m,and the end of the round steel clad with stainless steel with different amplitude is injected.The author summarizes the law of shock current dispersion of a type of grounding body when it is injected by shock current.The results show that the spark discharge effect of soil exists obviously in the dispersion of one-line grounding body,and the grounding body shows obvious end effect when it is scattered.When the end is injected,the ratio of the first end and the end of the discharge is about 5%~15%higher than that of the intermediate conductor.The impact resistance value of the end injection is 15%~25%higher than that of the central one,The test data can provide reference for the material selection and design of complex structure grounding body,it has enlightenment significance for the research of grounding body in line lightning protection.

关 键 词：暂态特性 火花放电 电感特性 散流 

分 类 号：TM862[电气工程—高电压与绝缘技术]