Optimization design of electric field potential for high-speed EMU high voltage box

Abstract Establish the three-dimensional model of high-voltage box and its internal main electrical equipment of EMU. Under the lightning overvoltage condition, through modeling and analyzing the electric field potential distribution of high-voltage components of EMU, understand the insulation weak links of high-voltage components, optimize the insulation gap of high-voltage components, local structure of components and system layout, and systematically master the layout design of high-voltage equipment of EMU method. The research results show that under the lightning overvoltage condition, the areas with higher electric field strength are mainly concentrated in the inlet port of the cable and the outlet port of the circuit breaker, the maximum electric field intensity is concentrated near the electrode of the electromagnetic voltage transformer, and the maximum field strength in the high voltage box is 21.5kv/cm, which meets the air breakdown standard, has certain safety margin and meets the insulation requirements.