The use and characteristics of ring network fixed indoor AC closed switch

The box-type fixed AC metal-enclosed ring network switchgear (abbreviated as the ring network cabinet) is a switch complete equipment in a ring network power supply and distribution system and a radiant power supply and distribution system with a three-phase AC rated voltage of 12KV and a rated frequency of 50HZ as a transformer. , cables, overhead lines and other electrical equipment for protection, control purposes. <BR>Structural features: The ring network cabinet is mainly composed of a load switch, a combination electric appliance and a metal cabinet body. According to different installation orientations of the switch electrical appliances, the cabinet body has two basic cabinet types; a side loading cabinet and a positive loading cabinet. Side-mounted cabinets have a small footprint, and they are easy to use; counter-mounted cabinets are convenient for maintenance and cable installation. The structure of the ring network cabinet cabinet is made of profile or aluminum-zinc steel plate. The structure is firm, and the sealing is good. It has IP3X shell protection grade. The surface of the steel plate is coated with an epoxy powder coating process, which is beautiful and firm. The RMU is designed as two completely isolated metal compartments: the bus room and the switch room, with no additional isolation board for safe inspection and replacement of fuses. The busbar room is enclosed by metal and the busbars are connected through a wall bushing. According to the requirements, a fully isolated instrument room may be provided in front of the busbar room to specially install secondary equipment. The switch room is mainly used for the installation of primary equipment and cable connections. The cabinet doors and switches realize five mechanical interlocks and are simple and reliable. The cabinet door is provided with a viewing window to facilitate observation of the isolated fracture and inspection of the operating status. The pressure relief device is installed on the top of the ring main unit. There is a pressure release channel in the cabinet. When there is an internal fault, the accident will be limited and the huge energy will be released to ensure personal safety.