It has the advantages of reasonable design, reliable power supply, compact structure, convenient installation, flexible operation, small size, high performance-price ratio, etc. This product is applicable to three-phase AC 50Hz, rated voltage 12kV distribution system. It is especially suitable for receiving and distributing electric energy in small secondary distribution stations, switching stations, industrial and mining enterprises, urban residential areas, airports, railways, tunnels, high-rise buildings and other power systems.