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Ring main unit: It is a type of high-voltage switchgear that can be installed inside switch stations or outdoor switch boxes. The correct name for installation outside is outdoor switch station. The two functions are the same, but people are accustomed to calling outdoor switch stations ring main units.

Switching station: refers to a power supply and distribution facility used to receive and distribute electricity, known as a switch station in high-voltage power grids. Switching stations in medium voltage power grids are generally used for receiving and distributing 10kV power. A distribution device with medium voltage distribution inlet and outlet lines and power redistribution. Equivalent to an extension of the substation busbar, it can be used to solve the problem of limited spacing between incoming and outgoing lines or restricted corridors in substations, and play a role in power support in the area. When necessary, the medium voltage switchgear can be built together with the distribution room.

A ring main unit is a switchgear (outgoing switchgear) installed in each distribution branch, and the busbar of this switchgear is also part of the ring main line. That is to say, the circular trunk line is composed of the busbars of each outgoing cabinet connected together. Each outgoing cabinet is called a “ring main unit”. In fact, taking out a ring main unit alone does not reveal the meaning of “ring network”.