高速铁路路基段综合接地系统雷电冲击特性

发布时间：2018-11-20 13:20

【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。
[Abstract]:In order to study the lightning impact characteristics of the integrated grounding system of high-speed railway, the line model of roadbed section of high-speed railway is established by using electromagnetic analysis software CDEGS based on the method of moments, and the impact response under the action of lightning current is simulated and calculated. The influence factors and rules of lightning strike characteristics of integrated grounding system are analyzed. The results show that in the circuit structure, the lightning current can be separated by adding the protection line, the current of a single point entering the integrated grounding system can be reduced, and the impulse voltage amplitude of the lightning strike point can be greatly reduced. At the same time, the influence of the catenary pillar foundation in the line structure on the lightning strike characteristics can not be ignored. Compared with the distal pillar of the transverse connecting line of the ground wire by lightning strike, when the pillar near the line is struck, the through ground wire plays a greater role in dispersing current, and the amplitude of the impulse current at the connection system of the lightning strike pillar to the integrated grounding system is increased. At the same time, the impulse current in the grounding system is attenuated at a faster speed. The increase of soil resistivity will increase the impulse voltage amplitude of lightning strike point, change the distribution of conductors, slow down the attenuation speed of impulse current on the earth wire, and increase the impulse voltage amplitude of each point on the through earth wire.
【作者单位】：西南交通大学电气工程学院;
【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)~~
【分类号】：TM862.3

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