1. Definition of the ring main unit

The ring main unit (RMU for short) is a group of transmission and distribution electrical equipment (high-voltage switchgear), which is usually installed in a metal or non-metallic insulating cabinet, or an electrical equipment in the form of an assembled interval ring network power supply unit. Its core part is mainly composed of load switches and fuses, which has the advantages of simple structure, small size, low price, and can improve power supply parameters and performance as well as power supply safety.

2. Performance advantages of the ring main unit

1. Power supply reliability: The ring main unit is an important distribution equipment in the medium-voltage distribution system. It uses high-quality materials and advanced manufacturing processes to ensure its stable operation under various environmental conditions and improve the reliability of power supply. The design of the ring main unit is to provide a compact, safe and reliable solution for distributing electrical energy, controlling the flow of current, protecting grid equipment and isolating fault areas in a ring power supply network.

2. Environmental protection:

3. Safety: The ring main unit organically combines components such as vacuum arc chambers, core circuits and insulating brackets to form a fully insulated, sealed and maintenance-free structure with good barrier and explosion-proof properties, which greatly improves the safety of the power system and extends the service life of the equipment.

4. Flexibility and convenience:

5. Intelligence: The modular design of the ring main unit makes its installation, commissioning and replacement very convenient, and new modules or functions can be added according to the development needs of the power grid. At the same time, its IP67 waterproof design also ensures the stable operation of the equipment in various harsh environments. RMU can be connected to the distribution automation system to achieve remote monitoring and remote control, which enables operation and maintenance personnel to monitor the operating status of the equipment in real time, discover and handle faults in time, and improve the operation and maintenance efficiency and the reliability of the power grid.

3. Application fields of ring main unit

Ring main unit is widely used in various power systems and places, especially in places where frequent operation and maintenance are required, such as urban residential areas, high-rise buildings, large public buildings, factories and enterprises, and other load centers. Distribution stations and box-type substations. It is mainly used to improve the reliability and stability of power supply, especially in AC 10KV distribution systems, such as industrial and mining enterprises, seaports and multi-story buildings. Because of its small load volume, its high-voltage control circuit is generally operated by high-voltage load switches or vacuum contactors, and fuses are set up for maintenance, so it can meet the power demand of these places.

4. Development trend of ring main unit

With the construction of smart grids and changes in the power supply and demand structure, ring main units are also developing continuously. In the future, the ring main unit will be more intelligent and automated, and can be remotely monitored and remotely controlled through the Internet of Things technology. It can be operated without leaving home, improving the reliability and operation efficiency of the power grid. At the same time, the ring main unit will also be more energy-saving and environmentally friendly, adopting more efficient power conversion and control technology to reduce energy waste and environmental pollution.

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