DC CIRCUIT GROUND FAULT SEARCH DEVICE AND DC CIRCUIT GROUND FAULT ACCIDENT SPOT SEARCH METHOD

摘要

PROBLEM TO BE SOLVED: To provide a DC circuit ground fault search device and a DC circuit ground fault accident part search method, which allow a firm search for a ground fault accident spot on an uninterruptive power basis.;SOLUTION: The DC circuit ground fault search device 10 includes: an insulated DC power source 11 for supplying an output voltage a few bolts lower than a circuit voltage supplied from a DC power supply device 110 to one of first through third loads instead of the circuit voltage to the load when a ground fault accident spot is searched for and when circuits 3₁ through 3₃ connecting voltage supply lines 1 and 2 to the one load are disconnected; a voltage-to-ground measurement part 12 for measuring a positive voltage-to-ground and a negative voltage-to-ground of the voltage supply lines 1 and 2; and a control part 13 for determining whether the circuit is a ground fault accident spot on the basis of the positive earth voltage and the negative earth voltage measured by the voltage-to-ground measurement part 12 when the ground fault accident spot is searched for.;COPYRIGHT: (C)2012,JPO&INPIT