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With the continuous increase in the capacity of traction power supply, as the capacity of traction power supply systems for high-speed railway vehicles continues to increase, frequent occurrences of excitation inrush currents disrupt the regular operation of signal equipment, consequently impacting transportation efficiency. This paper analyzes the mechanism of excitation inrush current generation in electrified railway locomotive transformers, and establishes an equivalent simulation circuit model of the traction power supply system during transformer closure. The model analyzes variations in excitation inrush currents in locomotive transformers under different conditions. The model is validated by integrating it with on-site test data. Drawing from transformer design principles, a simulation device for excitation inrush currents is developed, and a platform is established to conduct interference resistance tests on track circuit equipment. Finally, the paper proposes relevant measures to suppress excitation inrush currents.

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Research on Influencing Factors and Simulation Device of Excitation Inrush Current in EMU

  • 会议论文

  • 发表日期：

    2025年

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  • Shuo Liu,
  • Shiwu Yang,
  • Shaotong Chu,
  • Zijun Wei,
  • Jiangfa Xiong

摘要

With the continuous increase in the capacity of traction power supply, as the capacity of traction power supply systems for high-speed railway vehicles continues to increase, frequent occurrences of excitation inrush currents disrupt the regular operation of signal equipment, consequently impacting transportation efficiency. This paper analyzes the mechanism of excitation inrush current generation in electrified railway locomotive transformers, and establishes an equivalent simulation circuit model of the traction power supply system during transformer closure. The model analyzes variations in excitation inrush currents in locomotive transformers under different conditions. The model is validated by integrating it with on-site test data. Drawing from transformer design principles, a simulation device for excitation inrush currents is developed, and a platform is established to conduct interference resistance tests on track circuit equipment. Finally, the paper proposes relevant measures to suppress excitation inrush currents.