考虑火花效应的杆塔接地体冲击特性仿真研究  

Simulation Research on Impulse Characteristics of Tower Grounding Bodies Considering Spark Effect

作　　者：王涛[1] 胡显哲 萧威 隋首钢[1] 贝太学[1] 袁海燕 WANG Tao;HU Xianzhe;XIAO Wei;SUI Shougang;BEI Taixue;YUAN Haiyan(School of Information and Electrical Engineering,Shandong Jianzhu University,Jinan 250101,China;Guohua Energy Investment Co.,Ltd.,Jinan 250000,China;State Grid Shandong Electric Power Research Institute,Jinan 250003,China)

机构地区：[1]山东建筑大学信息与电气工程学院,济南250101 [2]国华能源投资有限公司,济南250000 [3]国网山东省电力公司电力科学研究院,济南250003

出　　处：《电瓷避雷器》2019年第4期29-34,43,共7页Insulators and Surge Arresters

基　　金：山东省重点研发计划(编号:2016ZDJS02A12)

摘　　要：为研究雷击杆塔时接地体的冲击特性,以便优化设计接地体结构,针对雷电冲击时产生的火花效应,运用电磁暂态分析软件ATP-EMTP,搭建了接地体射线的时变非线性冲击阻抗模型.在验证模型的基础上,研究了接地体冲击接地阻抗受雷电流波前时间、土壤临界击穿场强及射线长度的影响.仿真结果表明:波前时间与冲击接地阻抗呈反比关系,波前时间越长,冲击接地阻抗越小;冲击接地阻抗正比于土壤临界击穿场强;对于高土壤电阻率的地区,雷电流幅值在10~110 kA之间,接地体射线的有效长度为40m,无限加长射线长度不利于减小冲击接地阻抗.所得结论对于接地网优化改造、接地体射线长度选取具有指导意义.In order to study the characteristics of grounding bodies under lightning impulse for optimizing the structure of grounding body,a model for grounding bodies ray is established,considering the spark effect caused by lightning impulse.The model describes the time-varying nonlinear impulse grounding impedance,using the electromagnetic transient analysis software ATP-EMTP.Based on the verified model,the influential factors such as lighting current front time,critical breakdown field strength,and the length of grounding bodies ray were studied.The simulation results show that the wave front time is inversely proportional to the impulse grounding impedance.The greater the wave front time,the smaller the impulse grounding impedance.The impulse grounding impedance is proportional to the critical breakdown field strength of soil.For areas of high soil resistivity,when the lightning current amplitude between 10 kA and 110 kA,the active length of the grounding bodies ray is 40m.And increasing the ray length infinitely is not conducive to reducing the impulse grounding impedance.The results above can be used for optimizing the grounding grid and selecting the length of grounding bodies ray.

关 键 词：火花效应 时变非线性 冲击接地阻抗 ATP-EMTP 有效长度 

分 类 号：TM8[电气工程—高电压与绝缘技术]