Study on the Distribution Characteristics of Grounding Current at Axle End of Standard EMU

The grounding mode of high-speed EMU is directly related to the EMC performance of EMU. Excessive grounding current will lead to poor grounding reflux of EMU, which will bring security risks to the normal operation of EMU. Therefore, in order to study and predict the size and distribution of the EMU grounding current, analyze the EMU grounding performance and electromagnetic compatibility of the grounding system, it is of great significance to establish the EMU grounding current simulation model. In this paper, the grounding system of standard emu was briefly introduced, and according to the structure and parameters of the grounding system, the equivalent circuit model of grounding system of the standard EMU was established by using the simulation software. The distribution characteristics and rules of the grounding current at the axle end of EMU under the independent grounding and mixed grounding were analyzed. The conclusions are working grounding current at the axle end is greater than the protective grounding current when the independent grounding is adopted. The mix grounding is beneficial to the shunting of the working grounding current so that the working grounding current at the axle end is reduced.