DC ground fault location search method, ground fault current supply device, and DC ground fault monitoring system

摘要

PROBLEM TO BE SOLVED: To contribute to accurate and easy specification of a position where grounding occurs.SOLUTION: In the case where instantaneous grounding occurs, a ground detection device 5a (5b, 5c, ...) measures presence/absence of a grounding current supplied from a grounding current supply device 3. Namely, in the corresponding ground detection device 5a (5b, 5c, ...), a grounding current is measured, thereby specifying an instantaneous grounding position. In the case where grounding continues, an intermittent grounding current is supplied from the grounding current supply device 3, and a grounding position is specified using the ground detection device 5a (5b, 5c, ...). Namely, since a grounding current flows from a grounding point toward a power source on a line where grounding occurs, the ground detection device 5a (5b, 5c, ...) at a position where grounding occurs is operated.