American prefabricated substations is based on urban and rural power grid construction and development and transformation of the needs of the development of a series of products. It is the transformer body, switchgear, fuses, tap-changers, low-voltage power distribution equipment and other auxiliary equipment for the combination of transformer, to meet the user energy metering, reactive power compensation, low voltage shunt and other preparation requirements. ZGS-type modular transformer as AC 50Hz, 6 ~ 10kV network, rated capacity of 63 ~ 1600kVA independent set of power distribution equipment, both for outdoor use, can also be used indoors. Widely used in industrial parks, urban residential areas, commercial centers, high-rise buildings and temporary construction sites and other places.