CHEN Wanglong1, LI Yaning1, WANG Ye2
（1. School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China；2. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China）
Abstract： In order to explore the influence of soil resistivity on stray current in power supply system of urban rail transit, we establish an equivalent circuit model of the rail-to-ground structure based on resistance network method first. After measuring the soil resistivity of a real subway system, a simulation model is established in Matlab to obtain the stray currents at different soil resistivities. Then the influence of soil resistivity on stray current is analyzed. Afterwards, to verify the rationality and reliability of the simulation model, we design a test circuit to measure the stray current and rail-to-ground voltage in a real subway system, and a comparison of the experimentally measured results and simulation results is presented. The results show that the stray current is the maximum when the soil resistivity is 211.57 Ω·m; when the soil resistivity is 768.47 Ω·m, the stray current is the minimum, that is, the smaller the soil resistivity, the greater the stray current. Therefore, the resistivity should be increased as much as possible when ramming the track foundation in urban rail transit system.
Key words： urban rail transit； power supply system； stray current； soil resistivity； four-electrode method
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土壤电阻率对城市轨道交通供电系统杂散电流的影响
陈旺龙1， 李亚宁1， 王烨2
（1. 兰州交通大学 自动化与电气工程学院， 甘肃 兰州 730070；2. 兰州交通大学 环境与市政工程学院， 甘肃 兰州 730070）
摘要:为研究土壤电阻率对城市轨道交通供电系统杂散电流的影响， 首先， 基于电阻网络方法， 建立了走行轨-地结构的等效电路模型； 其次， 采用Matlab软件建立了相应的仿真模型， 分析杂散电流的变化规律； 最后， 对杂散电流进行实验测量， 并与仿真数据进行比较分析。 结果表明， 当土壤电阻率为211.57 Ω·m 时， 杂散电流最大； 当土壤电阻率为768.47 Ω·m时， 杂散电流最小。 由于土壤电阻率越小， 杂散电流越大， 因此， 工程上在夯筑城市轨道交通系统中的走行轨地基时， 应尽可能增大其电阻率。
关键词:城市轨道交通； 供电系统； 杂散电流； 土壤电阻率； 四极法
引用格式：CHEN Wanglong, LI Yaning, WANG Ye． Influence of soil resistivity on stray current in power supply system of urban rail transit． Journal of Measurement Science and Instrumentation， 2022， 13（3）： 261-266. DOI： 10．3969／j．issn．1674-8042．2022．03．002
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