APPARATUS FOR DETECTING GROUNDING CURRENT

摘要

A grounding current detecting device for detecting a grounding current of a non-grounded system according to an embodiment of the present invention comprises: a first terminal which receives a zero phase voltage from a ground potential transformer (GPT) installed in the non-grounded system; a second terminal which receives a detected current from a zero phase current transformer (ZCT) which penetrates three lines coupled with a motor; and a control unit which calculates an effective grounding current using a phase difference between the zero phase voltage received from the first terminal and the detected current received from the second terminal. According to an embodiment of the present invention, it is possible to improve reliability in detecting a grounding current in a non-grounded system.