GROUND FAULT PROTECTION SYSTEM AND GROUND FAULT PROTECTION DEVICE IN SUBSTATION FOR RAILROAD TRACK

摘要

PROBLEM TO BE SOLVED: To provide a ground fault protection system capable of operating a circuit breaker on a substation side to shut off a ground fault current when a high resistance ground fault occurs and a ground fault protection device used for the same.;SOLUTION: In a ground fault protection system at a substation for a railroad track to which an impedance bond is connected in the middle of a return wire, where a feed line and the return wire from the substation equipped with a transformer is laid, the substation is provided with a circuit breaker connected between the transformer and the electric wire or the return wire. Between the impedance bond and the earth, a ground fault protection device having discharge means for discharging when a voltage equal to or higher than a predetermined value is applied, and operation detection means capable of detecting operation of the discharge means is provided. The ground fault protection device includes signal sending means for generating a detection signal in response to the operation detection means detecting operation of the discharging means and outputting the detection signal to the substation and shuts off the circuit breaker when the substation receives the detection signal.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT