Three phase AC 600V contact rail power supply system is a new type of transportation power supply system, which is widely used in airport, amusement park and central business district. The power supply system adopts three-phase ac600v power supply system, and the type of traction network is power supply rail. Three conducting rails (A phase, B phase and C phase) and two grounding rails / signal rails are used in the system to realize the line current and signal conduction.