ZERO-PHASE-SEQUENCE CURRENT TRANSFORMER, GROUND-FAULT CURRENT DETECTION DEVICE, POWER CONDITIONER, AND METHOD OF DETECTING MALFUNCTION OF ZERO-PHASE-SEQUENCE CURRENT TRANSFORMER

摘要

The purpose of the invention is to enable simple and reliable detection in the event of an abnormality in a ZCT. This zero-phase-sequence current transformer (ZCT) (11), which detects zero-phase-sequence current in a plurality of power lines passed therethrough, is characterized in that in addition to the plurality of power lines, a wire through which a prescribed DC offset current flows is passed therethrough.