GROUND FAULT PROTECTION DEVICE AND GROUND FAULT PROTECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent breakage of signal equipment when a ground fault accident occurs on a feeder circuit.SOLUTION: A ground fault protection device 40 comprises: a discharge pipe 45 which is connected between a rail side terminal 41 and a ground side terminal 42, and discharges by over-voltage applied to a space between the rail side terminal 41 and the ground side terminal 42, for flowing a ground fault current i6; a switch 46 which is connected to the discharge pipe 45 in parallel, which short-circuits the discharge pipe 45 when it is opened and which releases short-circuit of the discharge pipe 45; a CT 47 which detects the ground fault current; and a drive circuit 50 which opens and closes the switch 46 based on the detection result of the CT 47. The drive circuit 50 comprises: detection means 51 which detects occurrence and dissipation of the ground fault current i6 or presence/absence of the ground fault current based on the detection result of the CT 47; and driving means 52 which opens and closes the switch 46 at a prescribed timing based on the detection result of the detection means 51.SELECTED DRAWING: Figure 1