Study on effect of earthing resistance on EMU radiation emission

This article is based on the existing national standard and discussed the standard test method and standard process. It was proposed that EMU traction return current could generate differential-mode radiation between the vehicle body and the rails, and an equivalent model was established. Based on the test, the EMU radiation emission was discussed in the static low-frequency (9KHz-11MHz) magnetic field with different earthing resistances. Tests show that the 50 milliohms earthing resistance between the EMU vehicle body and the rails can improve the EMU static radiation emission characteristic in low-frequency magnetic fields. An improving plan for the EMC design of high-speed EMU on suppressing the EMU electromagnetic radiation was provided.