大地电导率和回击电流幅值对架空单导线雷电感应电压的影响  

Influence of Ground Conductivity and Return-Stroke Current Amplitude onLightning Induced Voltage of Overhead Single Conductor

作　　者：于建立 关鹏宇 牟瑞 张迎栋 程龙[1] Yu Jianli;Guan Pengyu;Mu Rui;Zhang Yingdong;Cheng Long(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin Jilin 132012;Northeast Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Changchun Jilin 130021)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012 [2]中国电力工程顾问集团东北电力设计院有限公司,吉林长春130021

出　　处：《东北电力大学学报》2020年第6期61-66,共6页Journal of Northeast Electric Power University

基　　金：国家自然科学基金(51877034)。

摘　　要：为了对架空线雷电感应电压特性进行深入研究并排除平行多导线之间的影响,文中采用FDTD法计算地闪回击电场并基于Agrawal耦合模型计算单导线雷电感应电压.以大地电导率和回击电流幅值为特征量,考察二者对架空单导线不同观测点雷电感应电压的影响.结果表明,雷电感应电压脉冲波形与回击电流相似且导线两端脉冲极性相反,部分位置存在“双极性脉冲”.大地电导率低至5.0×10^-4 S/m时对感应电压峰值沿线分布影响明显,双极性脉冲时主次脉冲幅值均随大地电导率降低非线性提高.各观测点脉冲幅值均随回击电流幅值增大近似线性提高,大地电导率与回击电流幅值对架空单导线雷电感应电压的影响强度以及导线上不同位置的影响规律差异较大.In order to study the characteristics of lightning induced voltage on overhead transmission lines and eliminate the influence of parallel multi conductors,the electric fields generated by lightning return stroke were calculated by using FDTD method,and the lightning induced voltages of single conductor were calculated based on Agrawal coupling model.Taking the earth conductivity and the amplitude of return-stroke current as characteristic quantities,the influences of them on lightning induced voltages at different observation points of overhead single conductor were investigated.Results show that,the waveform of lightning induced voltage pulse is similar to that of return-stroke current,and the polarity of impulse at both ends of conductor is opposite,in addition there are“bipolar pulse”in some positions.When the earth conductivity is as low as 5.0×10^-4 S/m,it has a significant effect on the peak value distribution of lightning induced voltage along the line,and the amplitude of primary and secondary pulse increases nonlinearly with the decrease of earth conductivity.The pulse amplitude of each observation point increases approximately linearly with the increase of return-stroke current amplitude.The influence intensity of ground conductivity and return-stroke current amplitude on lightning induced voltage of overhead single conductor and the influence law at different positions on conductor are quite different.

关 键 词：架空单导线 雷电感应电压 大地电导率 回击电流幅值 

分 类 号：TM863[电气工程—高电压与绝缘技术]