2021 年 62 巻 2 号 p. 92-97
The detection of high-resistance ground faults in DC 1.5 kV traction power supply systems has remained an unresolved problem for years. There are several methods to detect such faults using additional devices and/or wires installed along tracks. However, due to cost and maintenance problems, there has been a demand for a fault detection method which uses only electrical measurements inside traction substations. To this end, we analyzed a recorded current waveform of an actual fault to find out its characteristics. Based on the results obtained, we proposed a novel method for detecting high-resistance ground faults with a discharging arc of more than a thousand amperes DC current.
