This ring main unit is based on air as the insulating medium, mainly equipped with ZFN-10/630 vacuum load switch, the main scheme is the inlet cabinet and the outlet cabinet.
The cabinet body is made of sheet metal processing, the frame is usually assembled by profile welding or C profile, the surface of the cabinet body is treated with plastic powder electrostatic spraying and anti-rust, and the required logo is used for screen printing or UV printing to customize the surface pattern identification.
The bottom base of the ring main unit is provided with a hoisting device, which can be hoisted and moved as a whole, and the lifting ring is set at the top of the internal cabinet body and can be hoisted into from the top of the ring main unit. All specifications, sizes and structures can be customized by drawing.
1. Inlet cabinet scheme
There is a ZFN-10/630 vacuum load switch in the main circuit of the cabinet, which is equipped with an isolation knife and, if appropriate, a grounding knife, which is installed in a frame and interlocked.
Therefore, it can realize the operation of three stations of bus connection, isolation and grounding, and the cabinet can also be flexibly equipped with CT, PT and other components.
2. Outlet cabinet scheme
The main circuit in the cabinet is composed of a ZFN-10/630 vacuum load switch, a fuse with an impactor (with the function of an isolation switch) and a grounding knife, which can also realize three-station operation.
Components such as CT/PT and ZN0 arresters can also be flexibly fitted into the cabinet, so that the metering cabinet can sometimes be dispensed with.
The inlet and outlet cabinets are equipped with insulating protective partitions that are locked with the grounding opening, and the switches in the cabinet are mechanically interlocked between the partitions and the cabinet doors, and meet the requirements of "five preventions", and the protection level of the cabinet shell is IP2X.
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