邻近地网暂态特性研究  

Transient Behavior of Adjacent Grounding Grid

作　　者：冉冉 陈佳祺 陈思学 刘芸秋 戴丽平 郭在华 RAN Ran;CHEN Jiaqi;CHEN Sixue;LIU Yunqiu;DAI Liping;GUO Zaihua(Petrochina Dalian Research Institute of Safety and Environmental Protection Technology,Dalian 116031,China;China Changan Automobile Group,Beijing 100089,China;Key Laboratory of China Meteorological Administration AtmosphericSounding,Chengdu 610225,China;School of Electrical Engineering,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]中国石油集团大连安全环保技术研究院,辽宁大连116031 [2]中国长安汽车集团有限公司,北京100089 [3]中国气象局大气探测重点开放实验室,成都610225 [4]成都信息工程大学电子工程学院,成都610225

出　　处：《电瓷避雷器》2023年第6期75-84,共10页Insulators and Surge Arresters

基　　金：四川省科技支撑计划“接地网智能监测与故障诊断系统研制”(编号:2022YFG0234);中石油课题“油气设施雷电地电位反击致灾机制及接地网智能故障诊断技术研究”(编号:2021DJ6804)。

摘　　要：由于雷电流冲击接地网时,造成地网将产生较高的地电位抬升,强大的过电压会将线路或装置的绝缘材料击穿损坏。基于人工引雷实验,观测两个相距10 m的雷击地网和邻近地网的地电位抬升电压特征,提出一种采用有限元法建立仿真模型,求解接地网三维瞬间变化,以此分析雷电流在接地网中的分布规律的研究方法。采用有限元仿真软件构建电磁暂态模型,将试验数据和仿真数据进行对比,得出结论,1)雷电流回击引起雷击地网和邻近地网电压瞬间都有明显的抬升,邻近地网GPR电压幅值上出现较大的衰减。2)雷电流是导致雷击地网GPR的主要因素,感应耦合的影响相对较小;邻近地网的转移电位可能是由土壤散流和雷击地网的电阻分量共同作用形成的。3)水平接地电极中电流的密度较大,散流能力较明显,且电场强度沿导体埋地深度的增加其相应的电场强度就会减弱。4)邻近地网靠近雷击地网的导体部分有很强的电场,邻近地网电场强度随远离雷击地网的距离的增加而不断衰减。When the lightning current impacts the grounding grid,the grounding grid will produce a higher ground potential rise,and the strong overvoltage will breakdown and damage the insulation material of the line or device.Based on the artificial lightning induction experiment,observing the characteristics of the grounding grid 10 m apart and the adjacent grounding grid,a research method of using finite element method to solve the three-dimensional instantaneous change of the grounding network,is proposed to analyze the distribution law of lightning current in the grounding network.The finite element simulation software is used to construct the electromagnetic transient model,compare the test data with the simulation data,and conclude that 1) the lightning current response causes obvious instantaneous rise in both the grounding grid and the adjacent grounding grid,and a large attenuation in the GPR voltage amplitude of the adjacent grounding grid.2) Lightning current is the main factor leading to GPR of lightning strike,and the influence of inductive coupling is relatively small;The transfer potential of adjacent ground strike may be formed by the resistance components of soil dispersion and lightning strike.3) The current density of electricity in the horizontal grounding electrode is large,the scattered current capacity is obvious,and the electric field strength along the increase of the conductor buried depth will be weakened.4) There is a strong electric field in the conductor part of the adjacent lightning strike grid,and the electric field strength of the adjacent ground grid decreases with the increase of the distance away from the lightning strike grid.

关 键 词：人工触发闪电 地网 仿真原件 

分 类 号：TM862[电气工程—高电压与绝缘技术]