高速铁路路基段弱电设备单独接地的可行性研究

发布时间：2019-03-16 14:45

【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。
[Abstract]:The coupling model between integrated grounding system and weak current system of high-speed railway is established by using the electromagnetic analysis software CDEGS based on the method of moments, and the shock response under the action of lightning current is simulated and calculated, and the impact response of the pillar is analyzed when the pillar is struck by lightning. Effects of different distance between weak current system and integrated grounding system, different soil resistivity and connection between weak current system and integrated grounding system on lightning strike characteristics of weak current system and through ground wire and their regularity. The results show that when the weak current system and the integrated grounding system are not connected, the voltage of the ground line is almost unchanged, and when the distance between the two systems is increased, the voltage of the weak current system decreases and the voltage of the ground line increases. The voltage amplitude of the grounding system increases with the increase of soil resistivity, and the voltage of the weak-current system is higher than that of the non-connected system when the weak-current system is connected to the integrated grounding system, and the voltage of the through-ground line is lower than that of the non-connected ground system. At the same time, the safe distance and regularity of the weak current system under different conditions are analyzed. It is concluded that the safe distance of the weak current system increases with the increase of resistivity, and the safety distance of the weak current system connected with the integrated grounding system is larger than that of the unconnected system.
【作者单位】：西南交通大学电气工程学院;
【基金】：铁道部科技计划资助项目(2011T008-D)
【分类号】：U284.93;TM862

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