The resistive ground fault of PWM voltage inverter in the EV charging station.

During the direct touch of the inverter output voltage or with the ungrounded shield of the cable connecting the inverter to the motor or other type of load, the nonsinusoidal ground currents with a basic harmonic frequency between 1.5 and 16 kHz, flow via a human's body. Here was proved that Residual Current Device (RCD) ([Formula: see text] = 30 mA) does not switch off the power supply when a ground current with a value of about some hundred milliamps occurs.