Review and Evaluation of Stray Current Mitigation for Urban Rail Transit
Sahil Bhagat1, Xiaofeng Yang2, Miao Wang2, Andrea Mariscotti3
1. Hitachi Rail STS Abu Dhabi 41096 UAE; 2. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China; 3. Department of Naval, Electrical, Electronics and Telecommunications Engineering (DITEN) University of Genova Genova 16145 Italy
Abstract：Stray current causes inevitable corrosion to structures near electric transportation systems, especially in DC urban rail transit. The paper considers the issue of stray current mitigation discussing what can be done for design and existing systems, sticking to applicable standards and consolidated protection practice. Mitigation measures may be devised for a new constructed system, such as the optimization of traction substation positions, reducing the longitudinal resistance of the running rails and return circuit, and using an additional stray current collection system (to be included in the track bed during construction). As for an existing system, besides increasing the total cross section of the aforementioned return circuit and stray current collection system by adding parallel conductors or cross-bonds, it is recommended to employ static converter units (e.g. negative resistance converters) to control the stray current in the return circuit. These units can be deployed in specific points where analysis or measurement indicates the large rail potential or incipient corrosion is spotted out.
Sahil Bhagat, 杨晓峰, 王淼, Andrea Mariscotti. 城市轨道交通杂散电流治理的综述与评估[J]. 电工技术学报, 2021, 36(23): 4851-4863.
Sahil Bhagat, Xiaofeng Yang, Miao Wang, Andrea Mariscotti. Review and Evaluation of Stray Current Mitigation for Urban Rail Transit. Transactions of China Electrotechnical Society, 2021, 36(23): 4851-4863.
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2021, Vol. 36 
