Cast resin dry-type transformers can be used as replacement products for oil-immersed distribution transformers ,have characteristics such as flame-retarded,damp proof,high heat dissipation capability and non-pollution,especially applicable used for the Urban power grids, high-rise Buildings, business centers, theaters,Hospitals, hotels, tunnels, subways, underground power plants,Laboratories, stations,docks, airports, combined substation and other important places.