KPJ series power supply electric flat car is reel to cable drum ac 380 V power supply. Cable reel is hysteresis coupling type, to ensure uniform cable force is not easy to pull the bad. Ac 380 V to V2 fan on flat car lifting metallurgical motor power, motor running flat wagon. Flat wagon runtime cable drum automatically to roll up the cable or release, affected by the volume tube power supply line, general maximum running distance is less than 200 m. The type of flat wagon advantage is using adapt to bad working condition of metallurgical lifting motor, flat car structure simple, reliable and economic price, construction is convenient.