Analysis the Effect of Complex Soil Structure on Potential Distribution Caused by Metro Stray Current

2021 International Conference on Power System Technology (POWERCON) Pub Date : 2021-12-08 DOI:10.1109/POWERCON53785.2021.9697768

Yuhang Tang, Yanru Ni, Kun Yu, Xiangjun Zeng, Chao Zhuo, Wei Han

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Abstract

The stray current of urban rail transit will lead to nearby soil potential change, which will cause transformer DC bias. Therefore, the calculation model of earth potential distribution was established based on complex soil structure in this paper Firstly, the traction power supply model of urban rail transit was established, and the analytical expression of stray current distribution was derived. Then, based on the numerical distribution results of metro stray current, the complex soil structure was established by finite element simulation software, and the soil potential calculation was realized. The simulation results showed that the soil structure has absolute influence on the change of earth potential distribution caused by metro stray current. With the greater the difference in soil resistivity of different layers, the influence on the soil potential is more obvious. The calculation of soil potential distribution caused by metro stray current can be realized, which has certain guiding significance for the evaluation of transformer DC bias.

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复杂土壤结构对地铁杂散电流电势分布的影响分析

城市轨道交通的杂散电流会引起附近土壤电位的变化，从而引起变压器直流偏置。为此，本文建立了基于复杂土壤结构的地电位分布计算模型，首先建立了城市轨道交通牵引供电模型，推导了杂散电流分布的解析表达式;然后，基于地铁杂散电流的数值分布结果，利用有限元模拟软件建立复杂土体结构，实现土势计算。模拟结果表明，土壤结构对地铁杂散电流引起的地电位分布变化有绝对影响。不同层间土壤电阻率差异越大，对土壤电位的影响越明显。实现了对地铁杂散电流引起的土壤电位分布的计算，对变压器直流偏置的评估具有一定的指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 International Conference on Power System Technology (POWERCON)

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