What is SF6 ring main unit? What is the use of RMU in power system?

2025,06,06

In modern power system, ring main unit (RMU) is an important electrical equipment, which is widely used in power distribution network to ensure the reliability and safety of power supply. Among them, SF6 gas insulated ring main unit has become the preferred solution in medium voltage power distribution field due to its excellent insulation performance and compact structural design.

Below, Hubei Jutai will introduce the characteristics and advantages of SF6 ring main unit and the main uses of RMU in detail, and explore its application in different scenarios.

What is SF6 ring main unit?

SF6 ring main unit is a switchgear that uses sulfur hexafluoride (SF6) gas as an insulating medium. It is mainly used in medium-voltage power distribution systems of 10kV, 20kV and 35kV. Compared with traditional air-insulated cabinets, SF6 ring main units have higher insulation strength, smaller size and stronger environmental adaptability. They are suitable for places with high space and safety requirements such as urban power grids, industrial parks, and commercial buildings.

Core advantages of SF6 ring main units

Excellent insulation performance

SF6 gas has extremely high dielectric strength, which is more than 3 times that of air. It can effectively prevent arcs and short circuits and improve the operating stability of equipment.

Compact structure and space saving

Due to the strong insulation capacity of SF6 gas, the volume of the ring main unit is much smaller than that of traditional air-insulated cabinets. It is particularly suitable for distribution rooms or underground substations with limited space.

Maintenance-free and long life

SF6 gas has stable chemical properties and is not easy to age, which greatly extends the maintenance cycle of the ring main unit and reduces the operation and maintenance costs.

Adapt to harsh environment

SF6 ring main unit has good dustproof, moisture-proof and corrosion-resistant properties, and can operate stably in high humidity, high pollution or high altitude areas.

High safety

The fully enclosed design is adopted to prevent personnel from accidentally touching live parts, and it is equipped with a reliable interlocking mechanism to prevent misoperation.

Main uses of RMU (Ring Main Unit)

RMU (Ring Main Unit) is a key device in the power distribution network. It is mainly used in the ring network power supply system to realize the distribution, control and protection of power. Its main functions include:

Ring network power supply: In the closed-loop power distribution system, RMU can realize the two-way flow of power, improve the reliability of power supply and reduce the power outage time.

Branch line protection: Equipped with load switches, fuses or circuit breakers, it can quickly cut off the current in the event of a fault to protect transformers and other electrical equipment.

Electricity distribution: Distribute high-voltage electricity to multiple low-voltage user ends, suitable for residential areas, commercial centers, industrial plants and other scenarios.

Fault isolation: When a section of the line fails, RMU can quickly isolate the fault area to ensure normal power supply of other lines.

Application scenarios of SF6 ring network cabinet

Urban distribution network

Due to the shortage of urban land, the compact design of SF6 ring network cabinet makes it an ideal choice for underground substations and cable branch boxes.

Industrial and commercial electricity

In places such as factories, data centers, and hospitals that require high continuity of power supply, RMUs can be used to build redundant power supply systems to avoid power outages caused by single-point failures.

New energy power generation

In distributed energy systems such as photovoltaic power stations and wind farms, SF6 ring main units can be used for power collection and grid-connected control.

Railway transportation

The power distribution systems of transportation facilities such as subways and high-speed railways require high-reliability equipment, and SF6 ring main units can effectively ensure stable power supply.

Hubei Jutai: High-quality ring main unit supplier

As a leading domestic electrical equipment manufacturer, Hubei Jutai focuses on the research and development and production of SF6 ring main units, transformers and other power equipment. Its products are widely used in power, energy, transportation and other fields. Its ring main units are known for their high reliability, intelligent control, energy saving and environmental protection, and are highly recognized by the market.

If you are looking for high-performance ring main units or transformer solutions, Hubei Jutai will provide you with professional products and technical support to help the power system operate efficiently and stably.

Author:

Mr. jiawenhan

E-mail:

JT13797437282@gmail.com

Phone/WhatsApp:

+86 13797437282