高速铁路路基段弱电设备单独接地的可行性研究  

Feasibility study on the separate grounding of weak current equipment of the high-speed railway roadbed section

作　　者：罗勋[1] 黄渤[1] 张先怡[1] 吴广宁[1] 曹晓斌[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《铁道科学与工程学报》2014年第6期62-67,共6页Journal of Railway Science and Engineering

基　　金：铁道部科技计划资助项目(2011T008-D)

摘　　要：运用基于矩量法的电磁分析软件CDEGS建立高速铁路综合接地系统与弱电系统接地耦合模型,并对其雷电流作用下的冲击响应进行仿真计算,分析支柱遭受雷击时,弱电系统与综合接地系统不同距离、不同土壤电阻率和弱电系统与综合接地系统连接情况对弱电系统和贯通地线雷击特性的影响及其规律。研究结果表明:当弱电系统与综合接地系统不连接时,贯通地线的电压几乎不变;当两者连接时,随着两者距离的增大,弱电系统的电压不断减小,贯通地线的电压不断增大。随着土壤电阻率增大,接地系统的电压幅值不断增大;弱电系统与综合接地系统连接时弱电系统电压比未连接时高,贯通地线的电压比未连接时低。同时,分析不同情况下弱电系统的安全距离大小与规律,得出弱电系统的安全距离随着电阻率的增大而增大,且弱电系统与综合接地系统连接时的安全距离比未连接时的大。This paper is based on CDEGS software to establish the coupling model of integrated grounding system and weak current grounding system of the high-speed railway,simulate and calculate the impulse response un-der the action of lightning current.When the pillar was striken by lightning,the lightning characteristics and the influencing rules of the weak current system and the wire through earth were analyzed under different distances between the weak current system and integrated grounding system,different soil resistivity and different connec-tion conditions of the weak current system and integrated grounding system.The results show that,when the weak current system and integrated grounding system are not connected,the voltage of the wire through earth is almost the same;while when they are connected,with the increase of the distance,the voltage of weak current system is decreasing,and the voltage of the wire through earth tends to increase.The voltage amplitude of grounding system is increasing with the increase of soil resistivity.The voltage of weak current system when the weak current system and integrated grounding system are connected is higher than that without connection,but the voltage of the wire through earth is lower than that with the absence of connection.At the same time,the pa-per analyzed the safety distance of the weak current system under different conditions,from which the conclusions can be reached that the safety distance of the weak current system is increasing with the increase of resistivity, and the safe distance when the weak current system is connected to the integrated grounding system is higher than that without connection.

关 键 词：高速铁路 弱电设备 接地 CDEGS 

分 类 号：U284[交通运输工程—交通信息工程及控制]