What is the difference between a ring main unit and a switch
2025-11-12
Switchyard also refers to the power supply and distribution equipment used to receive and distribute electricity, and is called a switching station in high-voltage power grids. Switches in medium voltage power grids are generally used for receiving and distributing 10kV power. A distribution equipment with medium voltage distribution inlet and outlet lines and power redistribution. Equivalent to an extension of the substation busbar, it can be used to handle limited intervals or corridors between incoming and outgoing lines in the substation, and to provide power support in the area. If necessary, the switch station can be built together with the distribution room.
So the general meaning of a switch room is a transformer and distribution room, not a cabinet. The distribution room of the power supply bureau is generally called a switch station, managed by the power supply bureau (such as a 35/10KV substation with 30 10KV cabinets at the bottom of the transformer, which is the switch station). These 30 cabinets lead out to 15 different factories, and their outgoing lines are equivalent to the upper level of the incoming lines in the factory distribution room. ）The place where you can shut down your electricity is the switchyard!
A ring main unit is a type of high-voltage switchgear, and an outdoor ring main unit is simply placed outside. It can be installed inside the switch station or inside the outdoor switch box. The correct name for installation outside is outdoor switch station. The two functions are the same, except that people are accustomed to calling outdoor switch stations ring main units.
The outdoor ring main unit and the switch station function together, and the ring main unit alone is a cabinet with distribution equipment such as distribution boxes inside. It is divided into several inputs and outputs; And the switch must have at least a+b cabinets, plus busbars, cutouts, reserved cabinets, etc., to form a switch station.
1、 Different equipment properties
1. Switchyard: It is an electrical equipment that supplies high-voltage power to surrounding power units separately.
2. Ring main unit: It is a set of transmission and distribution electrical equipment (high-voltage switchgear) installed in metal or non-metal insulated cabinets or made into assembled interval ring main power supply units.
2、 Different applications
1. Switchyard: In the railway power system, a control location with maintenance trip circuit breakers and other equipment designed to ensure safe and reliable power supply without affecting the traction network when there are branch leads. Mostly located in hub stations, marshalling yards, electric locomotive depots, and turnaround sections.
Ring main unit: widely used in distribution stations and box type substations of load centers such as urban residential areas, high-rise buildings, large public buildings, factories and enterprises.
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