A Precise Identification Method for Fault Trains Based on Train Grounding Current

doi:10.11930/j.issn.1004-9649.202306063

Abstract

Abstract:

To solve the problem that faulty trains can't be accurately identified when the DC traction power supply system for the dedicated return rail has a short circuit fault between the positive pole and the train, a precise identification method is proposed for fault trains based on train grounding current. Firstly, an equivalent model is established for the bilateral power supply traction system. Secondly, the difference of train grounding current characteristics between the faulty trains and the normal trains are analyzed. Finally the precise identification method for fault trains based on the train grounding current is proposed. The proposed method uses the amplitude and direction of the train grounding current as the fault identification criteria. The train is judged as normal when the amplitude of the train grounding current is less than the setting value; the direction of the train grounding current is used as criterion when the amplitude is greater than or equal to the setting value, and the train with positive current direction is judged as faulty and the train with opposite current direction is judged as normal. This method is simple in principle and easy to implement. The adoption of bi-criterion can effectively avoid misjudgment and improve the reliability. The feasibility and effectiveness of the proposed method are verified by Matlab simulation and field test.

Key words: monorail transit, dedicated return rail, DC traction power supply system, train grounding current, fault trains, precise identification

Shicheng GUO, Yongsheng LIU, Jing WU, Wei HOU, Xin JIANG, Xiangliang ZHANG, Kai CHEN, Xiangjian SHI. A Precise Identification Method for Fault Trains Based on Train Grounding Current[J]. Electric Power, 2024, 57(7): 143-150.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202306063

https://www.electricpower.com.cn/EN/Y2024/V57/I7/143

Figures/Tables 11

Fig.1 Schematic diagram of DC traction power supply in straddle monorail transit system

Fig.2 Equivalent model of DC traction power supply system after positive pole short-circuiting occurs in train 1

Fig.3 Simplified equivalent model of DC traction power supply system after positive pole short-circuiting occurs in train 1

Fig.4 Flowchart of identification algorithm

Fig.5 Simulation model of DC traction power supply system

Table 1 Simulation model parameters

接触轨电阻 r₁/(Ω·km^–1)	接触轨电感 l₁/(mH·km^–1)	专用回流轨电阻 r₂/(Ω·km^–1)
0.0128^[25]	0.25^[25]	0.0128^[25]

专用回流轨电感 l₂/(mH·km^–1)	接地报警继电器电阻R_GR/Ω	接地继电器电阻R_64D/ Ω
0.25^[25]	750.00（正常时）； 10.00、0.25（故障时）	5.0^[6]

整流变压器容量S/(kV·A)	整流变压器原次边额定电压U₁/U₂/kV	整流变压器短路阻抗百分比U_k/%
3000^[18]	35/1.180^[18]	8^[16]

Fig.6 Waveform of train grounding current with RGR2=750 Ω

Fig.7 Waveform of train grounding current with RGR2=10 Ω

Fig.8 Waveform of train grounding current with RGR2=0.25 Ω

Fig.9 Wiring diagram of field test

Fig.10 Waveform of train grounding current from field two carriages test

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