Distribution of earth leakage currents in railway systems with drain auto-transformers

Chou, Chih‐Ju; Hsiao, Ying-Tung; Wang, Jhane-Li; Hwang, Yaw-Tzong

doi:10.1109/61.915494

Cited by 11 publications

(2 citation statements)

References 6 publications

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“…The stray current flows back to the negative pole of the traction substation through the ground grid along the line, building structural steel bars or soil. The leakage resistance of the rail to the ground is generally 5-100 Ω/km [17][18][19]. When the subway train is running, the leakage current flows into the ground through the leakage resistance, forming a moving leakage current source.…”

Section: A the Mechanism Of Stray Current Generationmentioning

confidence: 99%

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Tang¹,

Li²,

Xiao

et al. 2023

IEEE Access

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During the operation of the urban subway, there will be stray current leaking into the ground, which may invade the neutral point of the transformer along the line, causing the working magnetization curve of the transformer core to shift, thereby causing the direct-current (DC) bias effect of the transformer. Since there are unknown parameters in the equivalent circuit model of the stray current of the subway, in order to simplify the process of the influence of the subway operation on the neutral current, based on the analysis of the formation mechanism of stray current, a real subway line has been selected and a monitoring platform in the nearby high-voltage (HV) substation has been built to record the neutral current. Meanwhile, through the on-site recording of the entry and exit time of subway trains at four consecutive stations, the running trajectories of the subway trains can be reversed. According to the trajectory of the subway train, the recorded neutral current was re-divided into time periods, and the synergistic analysis of the neutral current and the train trajectory in the corresponding time period was carried out. The neutral current measurement results for 4 consecutive days indicate that the influence of the subway train on the neutral current of the substation is mainly the influence of the unbalanced load, and the degree of the unbalance mainly comes from the distance and the acceleration and braking of the subway train. The trajectory of the subway train is related to the amplitude of the neutral current. The closer the subway train is to the substation, the greater the impact on the neutral current.INDEX TERMS Neutral current, urban subway, DC bias, stray current.

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Section: A the Mechanism Of Stray Current Generationmentioning

confidence: 99%

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Tang¹,

Li²,

Xiao

et al. 2023

IEEE Access

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show abstract

“…stray currents), instead of establishing a complete comprehensive model of traction network-rails-integrated grounding. [17][18][19][20][21] Noticeably, on the one hand, the utilization of ballastless track beds in HSRs has greatly reduced the leakage current of the rail to the ground. 22 Grounding wires (stranded copper conductors laid in the trackside cable trough Ref.…”

Section: Literature Reviewmentioning

confidence: 99%

Discrete modeling and calculation of traction return-current network for 400 km/h high-speed railway

Yang

Liu

2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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The planned 400 km/h high-speed train capable of cross-border intermodal transportation will inevitably cause a greater return-current and bring more challenges to signaling infrastructure and integrated grounding while achieving stronger traction. Based on the existing AC autotransformer power supply mode, this paper proposes a discrete modeling and calculation method of the traction return-current network concerning impedance equivalent, realizing the simulation and quantitative analysis of the return-current distribution of multiple current-carrying conductors in the block section and station yard under the double-track condition. Then, the dynamic distribution is analyzed comprehensively considering traction power supply, signaling, and integrated grounding systems. Also, the method is verified with field test data. Finally, the simulation of the return-current proportion of multiple conductors is carried out under the dynamic operating conditions of high speed, and the distribution characteristics are compared and analyzed under different ballast resistances. In the most unfavorable case, the maximum return-current in the rails, grounding wire, and protective wire can reach 1046 A, 180 A, and 126 A, respectively. This work helps evaluate the electromagnetic compatibility between signaling and strong currents in engineering practice, further optimize the capacity configuration of equipment along the railway lines, and improve the signaling immunity design.

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Improved fault location method for AT traction power network based on EMU load test

Lin

Quan

et al. 2022

Rail. Eng. Science

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The autotransformer (AT) neutral current ratio method is widely used for fault location in the AT traction power network. With the development of high-speed electrified railways, a large number of data show that the relation between the AT neutral current ratio and the distance from the beginning of the fault AT section to the fault point (Q–L relation) is mostly nonlinear. Therefore, the linear Q–L relation in the traditional fault location method always leads to large errors. To solve this problem, a large number of load-related current data that can be used to describe the Q–L relation are obtained through the load test of the electric multiple unit (EMU). Thus, an improved fault location method based on the back propagation (BP) neural network is proposed in this paper. On this basis, a comparison between the improved method and the traditional method shows that the maximum absolute error and the average absolute error of the improved method are 0.651 km and 0.334 km lower than those of the traditional method, respectively, which demonstrates that the improved method can effectively eliminate the influence of nonlinear factors and greatly improve the accuracy of fault location for the AT traction power network. Finally, combined with a short-circuit test, the accuracy of the improved method is verified.

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Distribution of earth leakage currents in railway systems with drain auto-transformers

Cited by 11 publications

References 6 publications

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Discrete modeling and calculation of traction return-current network for 400 km/h high-speed railway

Improved fault location method for AT traction power network based on EMU load test

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