Analysis of Stray Current Leakage in Subway Traction Power Supply System Based on Field-Circuit Coupling

Shan Lin, Zhixi Tang (), Xia Chen, Xuehua Liu and Yunsheng Liu
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Shan Lin: Guangzhou Metro Design & Research Institute Co., Ltd., Guangzhou 510010, China
Zhixi Tang: School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China
Xia Chen: Guangzhou Metro Design & Research Institute Co., Ltd., Guangzhou 510010, China
Xuehua Liu: School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China
Yunsheng Liu: School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China

Energies, 2024, vol. 17, issue 13, 1-17

Abstract: In a rail transit system, there is a constant leakage of current from the subway rails to the earth, and these stray currents have complex propagation paths and a wide range of influence. Since no stray current collection devices are installed at subway depots, some of the stray current leaking from the mainline will converge at the depot, seriously corroding the structural reinforcement and buried metal of the station, thereby jeopardizing the normal operation of subway trains and passenger safety. In this paper, a field-circuit coupling method is proposed to analyze the current leakage and distribution law of the subway mainline and depot. It is found that the failure of the gauge block at the mainline will trigger the maximum leakage of rail current. Additionally, it is observed that the stray current distribution at the depot is mainly influenced by the operating status of the one-way conduction device (OWCD) and the change of rail potential. These results validate the applicability and effectiveness of the field-circuit coupling method proposed in this paper and provide new technical support for the study of stray current leakage distribution in subways.

Keywords: subway; stray current; leakage; distribution; field-circuit (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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