电瓷避雷器Issue(6)：75-84,10.DOI:10.16188/j.isa.1003-8337.2023.06.009
邻近地网暂态特性研究
Transient Behavior of Adjacent Grounding Grid
摘要
Abstract
When the lightning current impacts the grounding grid,the grounding grid will produce a high-er 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 an-alyze the distribution law of lightning current in the grounding network.The finite element simulation soft-ware 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Key words
artificially triggered lightaing/ground net/original of simulation引用本文复制引用
冉冉,陈佳祺,陈思学,刘芸秋,戴丽平,郭在华..邻近地网暂态特性研究[J].电瓷避雷器,2023,(6):75-84,10.基金项目
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) （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).Project supported by Science and Technology support Plan of Sichuan Province"Development of intelligent monitoring and fault diagno-sis system of grounding network"(No.2022YFG0234) （编号:2021DJ6804）
CNPC Project"Research on lightning and potential mechanism and intelligent fault diagnosis technology of grounding network"(No.2021 DJ6804). （No.2021 DJ6804）
