ZERO-PHASE HARMONIC FILTER WITH OVERLOAD PROTECTION USING NON-CONTACT SWITCHING DEVICE

摘要

PURPOSE: A zero-phase harmonic filter with an overload protecting function using a non-contact switching device is provided to be located in the side close to a load, thereby efficiently attenuating zero-phase harmonic waves. CONSTITUTION: A zigzag connection transformer(110) is connected to each phase line and each neutral line of a three-phase four-wire electricity distributing system. A detection unit(140) detects the state information of the zigzag connection transformer. A controller(120) generates a PWM signal by analyzing information measured by the detection unit. The detection unit detects the temperature of an iron core or a wire of the zigzag connection transformer.