Analysis Model of Leakage Current in Long Shield Power Cable in Inverter-Fed AC Drives

Abstract

At every switching time, a PWM inverter produces high-frequency leakage currents flowing through stray capacitors. As the inverter for a trash conveyance crane is installed far away from a motor, shield power cables between them become long, leakage currents pass each stray capacitors of the shielded cables and flow to the ground. This paper proposes a model circuit for analyzing leakage currents which flow into the shield of the cables. The effectiveness of the proposed model circuit is verified through the compares of simulated leakage currents using the proposed method and measured leakage currents.