多导体传输线耦合雷电波的特性分析  

Characteristic Analysis of Coupled Lightning Waves in Multi-Conductor Transmission Lines

作　　者：李祥超[1] 欧阳文 文巧莉 LI Xiangchao;OUYANG Wen;WEN Qiaoli(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044

出　　处：《电瓷避雷器》2022年第6期15-24,共10页Insulators and Surge Arresters

基　　金：国家重点研发计划(编号:2017YFC1501505)。

摘　　要：针对多导体传输线耦合雷电波形成过电压的问题,利用理论与试验相结合的方法,建立多导体传输线模型,利用雷电冲击平台冲击金属棒来模拟雷电通道,进行雷电冲击试验。得到以下结论:多导体传输线耦合电压波形为双指数波,波头部分的高频分量以阻尼振荡波形式衰减;多导体传输线耦合到的差模过电压和共模过电压都是随着冲击电流的增大而增大,耦合电压随着受测端负载增大而增大,非受测端负载的增大而减小,这是因为两端电阻分压造成的;多导体传输线耦合的能量随着冲击电流和线缆长度的增大而增大,最后通过研究传输线耦合电压与线缆长度关系来拟合曲线反推得到,当雷电流在30kA时,50m的多导体传输线耦合到电压峰值约为72V,研究结果对传输线耦合雷电波时终端敏感器件的防护具有一定的指导意义。Aiming at the problem of multi-conductor transmission line coupling lightning waves to form overvoltage,a multi-conductor transmission line model is established by combining theory and experiment,and lightning impulse platform is used to impact metal rods to simulate lightning channels and conduct lightning impulse tests.The following conclusions are obtained:the coupling voltage waveform of the multi-conductor transmission line is a double exponential wave,and the high-frequency component of the wave head part is attenuated in the form of a damped oscillation wave;the differential mode overvoltage and the common mode overvoltage coupled to the multi-conductor transmission line are all accompanied by the impulse current.The coupling voltage increases with the increase of the load on the tested end,and decreases with the increase of the load on the non-tested end.This is caused by the partial voltage of the resistance at both ends;the coupling energy of the multi-conductor transmission line increase as the impulse current and cable length increase.Finally,by studying the relationship between the coupling voltage of the transmission line and the cable length,the fitting curve is reversed when the lightning current is 30kA,the 50 m multi-conductor transmission line coupling to the peak voltage is about 72V,the research results have certain guiding significance for the protection of terminal sensitive devices when the transmission line is coupled with lightning waves.

关 键 词：多导体传输线 耦合过电压 雷电波 高频分量 

分 类 号：TM86[电气工程—高电压与绝缘技术]