This product is suitable for 10~500kV substations, power plants, high-rise buildings, residential areas and other distribution rooms, as well as small self-owned power plants, as high voltage switches, relay protection, automatic devices and other operations, control power supply and emergency lighting power supply. It can also be used in other places that require DC current power supply. This product conforms to the technical requirements of ZBK45017-90 "General Technical Conditions for DC panel for power network system", DL/T459-200 < Technical conditions for ordering DC Power panel (cabinet) "and LS(W)30-40JT < Technical Conditions for microcomputer Control DC Power Cabinet" and other standards, and the product quality reaches the domestic leading level. The charging device of this product can use high-frequency charging module and phased charging machine. The controller of this product can be PLC control type and single chip microcomputer type.