DC GROUND FAULT DETECTION SYSTEM OF DC ELECTRIC RAILWAY AND METHOD FOR DETECTING DC GROUND FAULT

摘要

PROBLEM TO BE SOLVED: To enable a ground fault section to be accurately distinguished in a DC electric railway in which DC electric power is supplied to electric cars from a plurality of feeder substations via electric wire.SOLUTION: The present invention comprises: a VLD control and data collection device 51, provided for each feeder section of each feeder substation, which includes a shorting switch (VLD 50) interposed between a rail 37 and a ground 38 and closed when a rail-ground voltage rises to or above a set voltage, and which collects electric information including the rail-ground voltage and a current passing through the shorting switch after the shorting switch is closed; and a ground fault discrimination device 60 for discriminating a ground fault from the current value, conduction time and conduction direction of the shorting switch passing current, on the basis of the electric information collected by the VLD control and data collection device 51.SELECTED DRAWING: Figure 1