Design and verification of an improved experimental platform for stray current in urban rail transit

Abstract

With the rapid development of urban rail transit, there have been an urgent problem of excessive stray current. Because the stray current distribution is random and difficult to verify in the field, we designed an improved stray current experimental platform by replacing the simulated aqueous solution with a real soil environment and by calculating the transition resistance by measuring the soil resistivity, which makes up for the defects in the previous references. Firstly, the mathematical models of rail-drainage net and rail-drainage net-ground were established, and the analytical expressions of current and voltage of rail, drainage net and other structures were derived. In addition, the simulation model was built, and the mathematical analysis results were compared with the simulation results. Secondly, the accuracy of the improved stray current experimental platform was verified by comparing the measured and simulation results. Finally, based on the experimental results, the influence factors of stray current were analyzed. The relevant conclusions provide experimental data and theoretical reference for the study of stray current in urban rail transit.

Keywords

urban rail transit / stray current / experimental platform / transition resistance / soil resistivity

References

[1] CHEN W L, LI Y N, WANG Y. Influence of soil resistivity on stray current in urban rail power supply system. Journal of Measurement Science and Instrumentation,2022,13(3): 261-266.

[2] WANG F, LIU B F, WANG D L. Status assessment for the urban rail transit preloaded substations based on Matter-Element Extensible Theory. Journal of Railway Science and Engineering, 2020,17(2): 477-484.

[3] SAHIL B, YANG X F, WANG M, et al. Review and evaluation of stray current mitigation for urban rail transit. Transactions of China Electrotechnical Society, 2021,36(23): 4851-4863.

[4] GU J D, YANG X F, ZHENG Q L, et al. Rail potential and stray current on negative resistance converter traction power system under different grounding schemes and train conditions. Transactions of China Electrotechnical Society, 2021, 36(23): 4851-4863.

[5] LIN S, WANG A M, LIU M J, et al. A multiple section model of stray current of DC metro systems. IEEE Transactions on Power Delivery, 2021, 36(3): 1582-1593.

[6] LI Y N, LI M, GAO X H, et al. Simulation and experimental verification of stray current in urban rail transit based on CDEGS modeling. Journal of the China Railway Society, 2021,43(12): 49-54.

[7] DUAN R. Analysis and solution research on abnormal action of rail potential limiting device. Electric Railway,2020,31(6): 73-76.

[8] WANG C T, LI W, WANG Y Q, et al. Chloride-induced stray current corrosion of Q235A steel and prediction model. Construction and Building Materials, 2019, 219: 164-175.

[9] YU K, NI Y R, ZENG X J, et al. Modeling and analysis of transformer DC bias current caused by metro stray current. IEEJ Transactions on Electrical and Electronic Engineering,2020,15(10): 1507-1519.

[10] OGUNSOLA A, SANDROLINI L, MARISCOTTI A. Evaluation of stray current from a DC-electrified railway with integrated electric-electromechanical modeling and traffic simulation. IEEE Transactions on Industry Applications,2015,51(6): 5431-5441.

[11] WANG Y Q. Study on Metro stray current distributing and corrosion intelligent monitoring method. Xuzhou: China University of Mining and Technology, 2012.

[12] CHARALAMBOUS C A, AYLOTT P, BUXTON D. Stray current calculation and monitoring in dc mass-transit systems: interpreting calculations for real-life conditions and determining appropriate safety margins. IEEE Vehicular Technology Magazine,2016,11(2): 24-31.

[13] DU G F, WANG J, JIANG X X, et al. Evaluation of rail potential and stray current with dynamic traction networks in multitrain subway systems. IEEE Transactions on Transportation Electrification, 2020, 6(2): 784-796.

[14] LOU J J, ZHANG D L. Dynamic distribution of rail potential and stray current in urban rail transit. Journal of Beijing Jiaotong University, 2020,44(3): 43-49.

[15] CHARALAMBOUS C A, AYLOTT P. Dynamic stray current evaluations on cut-and-cover sections of DC metro systems. IEEE Transactions on Vehicular Technology, 2014, 63(8): 3530-3538.

[16] LI Y G, LI J P, YUAN H M. Study on the Real-time Monitoring System of Laboratory Simulation of Metro Stray Current. China Railway Science, 2005, 26(5): 119-122.

[17] LI Y G, LI J P. Analog real-time monitoring system for subway stray current detection. Control Engineering of China, 2004, 11(S2): 150-152.

[18] CAO A L. Protection against stray current corrosion of buried metals pipeline. Chongqing: Chongqing University, 2010.

[19] LI M. Study on stray current of DC traction power supply system for urban rail transit. Lanzhou: Lanzhou Jiaotong University, 2020.

[20] ZHOU M, WANG J G, HUANG S B, et al. Experimental investigation on influencing factors in soil resistivity measurement. Rock and Soil Mechanics, 2011, 32(11): 3269-3275.

[21] WANG Y Q, HUANG Y J, PENG C K, et al. Evaluation model for dynamic interference of subway stray current based on surface potential gradient. Journal of Beijing Jiaotong University, 2020,44(3): 30-36.

[22] ZHU F, LI J, ZENG H S, et al. Influence of rail-to-ground resistance of urban transit systems on distribution characteristics of stray current. High Voltage Engineering,2018, 44(8): 2738-2745.