直流动态杂散电流在分层介质中的扩散模型

doi:10.19595/j.cnki.1000-6753.tces.210025

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Abstract In order to study the interference range and influence degree of the stray current of the DC traction power supply system, the distributed circuit of the return system was equivalent to a centralized circuit. The node voltage method is used to calculate the system power flow. Accordingly, a dynamic distribution model of the stray current over time was established, and the diffusion model of dynamic stray current in layered media was established by the superposition principle. The Prony method was used to solve the model. Compared with the simulation results of CDEGS software, the ground potential calculation error was within 8.66%. A domestic subway line adopts 6B grouping, the maximum speed is 80km/h, the departure interval is 2min, the concrete resistivity is 0.503Ω·km, and the soil resistivity is 38.9Ω·m. When the distance between the buried metal structure and the subway line is 50m, the rail transition resistance value is increased to more than 40Ω·km, or when the rail transition resistance value is 5.31Ω·km, the distance between the buried metal structure and the subway line is increased to more than 0.25km, and the ground potential gradient along the line is less than 2.5mV/m, which means shortening the power supply distance can reduce stray current interference.

Key words： DC traction power supply system stray current layered medium diffusion model influencing factors

Received: 07 January 2021

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TM922

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	Articles by authors
	Liu Wei
	Yin Yichen
	Pan Weiguo
	Yang Long
	Zhang Hao

Cite this article:

Liu Wei,Yin Yichen,Pan Weiguo等. Diffusion Model of DC Dynamic Stray Current in Layered Soil[J]. Transactions of China Electrotechnical Society, 2021, 36(23): 4864-4873.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210025 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I23/4864

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