BAND TYPE ZERO CURRENT TRANSFORMER WITHIN A GROUND FAULT CIRCUIT ALARM

摘要

A band type zero-phase current transformer with a ground fault circuit alarm is provided not to need external power by using a voltage charged in a battery through a rectification circuit as power of the ground faulty circuit alarm. A band type zero-phase current transformer includes a leakage current sensing unit(10) and a leakage current checking and alarming unit(20). The leakage current sensing unit senses a leakage current of each line on an R, Sк, Tк, and Nк phase of a transformer. The leakage current checking and alarming unit measures the leakage current sensed by the leakage current sensing unit after selecting one mode among three modes(leakage current display mode, pre-alarm mode, alarm mode) and notifies the leakage current to a user through an alarm lamp or a buzzer(25) if it is determined that there exists the leakage current.