FAILURE MONITORING METHOD AND SYSTEM FOR POWER SUPPLY MAIN LINES FOR TRAIN, AND TRAIN

A failure monitoring method and system for power supply main lines for a train, and a train. The train is equipped with 74 V direct current power supply lines and 480 V alternating current power supply lines that run through the entire train and are arranged in parallel in the length direction of the train; the 74 V direct current power supply lines form loops, and the 74 V direct current power supply lines and the 480 V alternating current power supply lines share connectors at the train ends and are not connected to each other. The method comprises: performing detection on the 74 V direct current power supply lines, and according to the detection result, determining whether there is a power supply failure in the 480 V alternating current power supply lines. The working conditions of the power supply main lines for the entire train are monitored by means of hard wires running through the entire train; the monitoring method is efficient and convenient, and the reliability and safety of the vehicle are improve