GROUND FAULT POINT DETECTION DEVICE AND GROUND FAULT POINT DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a detection device capable of detecting a ground fault point from a ground surface with high accuracy by excluding human work as much as possible at a portion for identifying the ground fault point of an underground distribution line.SOLUTION: A ground fault point detection device comprises: a detection signal injector (1) that injects two detection signals (S1 and S2) with mutually inverted phases, between a line including a ground fault phase of an underground distribution line and the ground, and also injects a base signal (S3) with a frequency different from each of the detection signals (S1 and S2) between a sound phase and the ground; a first magnetic field detection sensor (21) that detects a magnetic field generated by the two detection signals (S1 and S2) which are propagated in the underground distribution line; a second magnetic field detection sensor (22) that detects a magnetic field generated by the base signal (S3); and a portable magnetic field sensor unit (2) that compares and calculates respective magnetic field levels on the basis of the magnetic fields detected by the magnetic field detection sensors (21 and 22), and determines a ground fault point of the underground distribution line.