雷击500 kV输电线路杆塔分流特性计算研究  

Simulation Study on Surge Current Distribution due to Lightning Strike on 500 kV Transmission Line Towers

作　　者：李磊 张雷 黄登一 吴敏[2,3,4] 富梦迪 孔繁哲 LI Lei;ZHANG Lei;HUANG Dengyi;WU Min;FU Mengdi;KONG Fanzhe(North China Branch of State Grid Corporation of China,Beijing 100053,China;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,China;National Energy Key Laboratory of Lightning Disaster Detection,Early Warning and Safety Protection,Wuhan 430074,China;Hubei Key Laboratory of Power Grid Lightning Risk Prevention,Wuhan 430074,China)

机构地区：[1]国家电网有限公司华北分部,北京100053 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [3]电网雷击风险预防湖北省重点实验室,武汉430074 [4]国家能源雷电灾害监测预警与安全防护重点实验室,武汉430074

出　　处：《电瓷避雷器》2024年第6期36-43,共8页Insulators and Surge Arresters

摘　　要：雷击对输电线路安全运行和设备可靠性造成了严重威胁。目前针对真实环境和运行条件下500 kV输电线路杆塔雷电流分流特性研究还不够全面。本研究利用ATP-EMTP进行雷击500 kV输电线路仿真计算,研究多种工况下被雷击杆塔的分流系数。研究结果表明,雷电流波头时间从1.2μs增大至20μs,杆塔分流系数降低40%;半波时间从20μs增大至350μs,杆塔分流系数降低0.8%;雷电流幅值对分流系数无影响;杆塔接地电阻从1Ω增大至30Ω,杆塔分流系数降低19.7%;雷击终端杆塔时分流系数小于非终端杆塔;使用良导体地线可以降低杆塔分流系数。利用上述研究成果合理设计和布置杆塔防雷设施,对于减少雷击对输电线路影响至关重要。Lightning strikes pose a serious threat to the safe operation of transmission lines and equipment reliability.At present,the research on the current distribution characteristics of tower lightning in 500 kV transmission lines under real environment and operating conditions is not enough.In order to enhance the lightning protection level of transmission lines,the author conducts simulation calculations of lightning strikes on a 500 kV transmission line using ATP-EMTP.The research focuses on investigating the arrester shielding factor of towers under various conditions.The research results indicate that the steeper the wavefront of lightning current,the greater the shielding factor of the tower,while a larger half-wave time leads to a smaller shielding factor of the tower.The amplitude of lightning current has no effect on the shielding factor.Additionally,a higher tower grounding resistance results in a smaller shielding factor.Moreover,the shielding factor decreases when the tower at the terminal end is struck by lightning.Furthermore,the use of good conductor ground wires can reduce the tower's shielding factor.Rational design and placement of lightning protection facilities for towers based on the research results are crucial for mitigating the impact of lightning strikes on transmission lines.

关 键 词：输电线路 雷电流分流系数 接地电阻 

分 类 号：TM75[电气工程—电力系统及自动化]