高速铁路路基段综合接地系统雷电冲击特性  

Lightning Impulse Characteristic of Integrated Grounding System of High-speed Railway Roadbed Section

作　　者：吴广宁[1] 黄渤[1] 曹晓斌[1] 崔运光 高峰[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《高电压技术》2014年第3期669-675,共7页High Voltage Engineering

基　　金：铁道部重大专项课题(2011T008);中央高校基本科研业务费专项资金(SWJTU11CX035)~~

摘　　要：为研究高速铁路综合接地系统雷电冲击特性,运用基于矩量法的电磁分析软件CDEGS建立了高速铁路路基段线路模型,并对其雷电流作用下的冲击响应进行了仿真计算,分析了综合接地系统雷击特性的影响因素及规律。结果表明:线路结构中,增设保护线可以对雷电流进行分流,降低单点进入综合接地系统的电流,大幅降低雷击点冲击电压幅值,同时线路结构中的接触网支柱基础对雷击特性的影响不能忽略;与雷击贯通地线横向连接线远端支柱相比,当雷击横向连接线附近支柱时,贯通地线发挥了更大的散流作用,受雷击支柱接入综合接地系统处冲击电流幅值增大,同时综合接地系统中的冲击电流以更快速度衰减;而土壤电阻率的增大,会增大雷击点冲击电压幅值,改变导体的分流情况,减慢贯通地线上冲击电流的衰减速度,并增大贯通地线上各点的冲击电压幅值。In order to investigate the characteristics of lightning impulses in the integrated grounding system of high-speed railways, after establishing a model of high-speed railway roadbed section using CDEGS which is based on the moment method, we calculated the response of lightning impulse, and then analyzed the influencing factors and regu- lar patterns of the lightning impulse characteristics. The results show that, the protective wire added in railway structure can shunt lightning current, decrease the current injecting into integrated grounding system through single junctions, and reduce the voltage of the lightning strikes significantly. Meanwhile, the effect of post foundations of catenary in railway structure on the lightning impulse characteristics can not be ignored. Compared with the case that lightning strikes a post far away from horizontal cable, when a lightning strikes on a post near horizontal cable, the wire through earth plays a greater role in diffusing current, so for the junction by which the struck post is connected to an integrated grounding sys- tem, its current amplitude increases while the current in the integrated grounding system decays faster. The increase of soil resistivity would increase the voltage amplitude of lightning strikes, change current-split proportion, slow the de- crease in current of the wire through earth, and increase the voltage amplitude at different points of the wire through earth.

关 键 词：高速铁路 路基段 综合接地系统 雷击特性 CDEGS软件 线路结构 雷击点位置 土壤电阻率 

分 类 号：TM862.3[电气工程—高电压与绝缘技术]