地铁高架桥段接触轨线路雷击闪络特性研究  

Research on Lightning Flashover Characteristics of Metro Contact Rail Line Along Viaduct Section

作　　者：孙晓东 曹晓斌[2] 李瑞芳[2] SUN Xiaodong;CAO Xiaobin;LI Ruifang(Xuchang Power Supply Company of State Grid Henan Electric Power Company,Henan Xuchang 461000,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]国网河南省电力公司许昌供电公司,河南许昌461000 [2]西南交通大学电气工程学院,成都610031

出　　处：《高压电器》2019年第7期135-141,共7页High Voltage Apparatus

基　　金：国家自然科学基金资助(51507145)~~

摘　　要：研究地铁高架段接触轨线路雷击闪络特性,对制定接触轨防雷标准有着十分重要的意义。文中基于滚球法分析了接触轨高架桥段线路易发生的雷击类型,在此基础上,搭建了地铁高架段接触轨模型,研究不同雷击类型条件下对应的雷击闪络特性,分析了桥墩接地电阻改变对各导体之间电压的影响。研究发现:地铁高架段接触轨供电系统主要受雷击避雷带跟雷击列车这两种雷击类型的影响。当雷击避雷带时,接触轨感应过电压造成绝缘支架闪络所需的雷电流水平低于地电位反击所需的雷电流水平,因此感应过电压是造成绝缘支架闪络的主要原因。而雷击列车时,雷电流幅值达到118kA才会通过感应的形式造成绝缘支架闪络,但此时累积概率较小,因此工程上认为引发绝缘支架闪络的可能性不高。It is very significant to setting up lightning protection standard for contact rail,studying on lightning flashover characteristics of contact rail line along viaduct section.The paper is based on the roiling ball method,the lightning strike type about metro contact rail are divided.On this basis,building the contact rail model of elevated section under different lightning stroke types,the lightning flashover characteristics under different lightning strike types are studied,and the influences of pier grounding resistance change on conductor voltage difference are analyzed.The research founds that two types between lightning strikes lightning strip and lightning strike train are prone to occur.When lightning strikes the lightning strip,lightning current level required for insulation bracket flashover,which caused by induced overvoltage of the contact rail is lower than that of ground potential counterattack,so the main reason for the insulation bracket flashover is the induced overvoltage.When lightning strikes the train,the lightning current amplitude reaches 118 kA,which will cause the insulation bracket flashover through the form of inducted overvoltage,but the cumulative probability is small,so the probability of lightning strike triggered insulated guardrail flashover is not high.

关 键 词：接触轨 闪络特性 绝缘支架 列车 避雷带 

分 类 号：U231[交通运输工程—道路与铁道工程] TM863[电气工程—高电压与绝缘技术]