雷击导致轨旁信号设备故障原因分析及对策  

Fault Analysis and Solution of Tackside Signal Devices Caused by Lightning Strike

作　　者：李雪 Li Xue(School of Rail Transportation,Shandong Jiaotong University,Jinan 250357,China)

机构地区：[1]山东交通学院轨道交通学院,济南250357

出　　处：《铁路通信信号工程技术》2023年第7期98-103,共6页Railway Signalling & Communication Engineering

摘　　要：雷电对接触网线或接触网线支撑架闪击后,安装在附近的信号设备及敷设的信号电缆会出现损坏或击穿故障。为研究雷电过电压及工频过电压造成信号设备故障原因,对雷电流和工频电流在入地点产生的电位升进行计算,发现分散接地的接触网支柱接闪雷电流幅值超过10 kA时,入地点产生的地电位升远大于信号电缆的冲击耐受电压,还可以通过钢轨对地泄露阻抗传导至轨面,造成与钢轨连接的信号设备故障。对分散接地方式接触网支柱附近信号设备及信号电缆在外铠接地、增强绝缘敷设、浪涌保护器(SPD)设置优化、绝缘电阻测试等方面提出优化措施,给类似场景的雷害分析和故障处理提供建议。After lightning strikes the overhead contact line or the support frame of the overhead contact line,signal devices installed nearby and signal cables laid may be damaged or broken down.In order to study the fault causes of signal devices caused by lightning overvoltage and power frequency overvoltage,the potential rise generated by lightning current and power frequency current at the entry point is calculated.It is found that when the amplitude of lightning current connected to the scattered grounded OCS pole exceeds 10 kA,the ground potential rise generated at the entry point is much larger than the impulse withstand voltage of signal cable,and can also be transmitted to the rail surface through the rail to the ground leakage impedance,resulting in the failure of the signal devices connected to the rail.Optimization measures are proposed for the signal equipment and signal cable near the OCS pole in scattered grounding mode,including outer armored grounding,enhanced insulation laying,SPD setting optimization,insulation resistance testing and other aspects,and suggestions are provided for lightning damage analysis and fault handling in similar scenarios.

关 键 词：雷电流 接触网支柱 分散接地 浪涌保护器(SPD) 信号分支电缆 

分 类 号：U284.93[交通运输工程—交通信息工程及控制]