China's high-speed railway adopts a single-phase AC power supply system. In order to balance the three-phase load on the grid side, the railway traction power supply system sets up a phase-separated area every 30km for commutation power supply. At present, most of the phase-separated areas of China's railways use automatic power-off and over-power phase mode. Before the train enters the neutral section, it will receive a signal to automatically disconnect the on-board circuit breaker to cut off the connection between the catenary and the train load. When the train passes through the articulated electrical phase separation,after on-site observation, the voltage drop between the pantograph and the catenary will break down the air when the pantograph slides on the neutral line and begins to gradually separate from the left branch catenary, resulting in repeatedly burning pantograph arcs. Since the on-board circuit breaker has been opened, the high-voltage cables on the train have no load current. The current thr

repeated arc burning, distributed parameter line model, improved Habedank arc model