What Is a Ring Network?

The Ring Main Unit is a group of electrical equipment for transmission and distribution (high-voltage switchgear) installed in metal or non-metal insulated cabinets or assembled into a partitioned ring network power supply unit. The core part of the network is a load switch and Fuse has the advantages of simple structure, small size, low price, can improve power supply parameters and performance, and power supply safety. It is widely used in distribution centers and box-type substations of load centers such as urban residential quarters, high-rise buildings, large public buildings, factories and enterprises.

A ring network refers to a ring-shaped power distribution network, that is, a power supply trunk line forms a closed loop.

Direct-acting pneumatic

2. Rotary Compressed Air

3. Rotary Magnetic Arc Extinction

4. Arc extinguishing grid

5.Quartz sand arc extinguishing ^[1]

The ring network cabinet has not appeared for a long time, but has been widely used. This is mainly due to the newly developed industrial enterprises and institutions. From the perspective of power supply and distribution, among them, the small capacity is the majority Its power distribution transformer generally does not exceed 1250KVA, stable power supply for a long time, and high-voltage switches are not operated frequently. For such users, the performance of the ring network cabinet is not perfect, but it is sufficient. With the large-scale urban construction, a large number of large high-rise buildings are rising, and the substations are often located downstairs. According to fire protection requirements, the substation equipment must be non-oilized and based on the reasonable use of the construction area Transformer and distribution equipment should be "miniaturized", so ring network cabinets or vacuum circuit breakers, dry-type transformers, and dry-type transformers have entered buildings. The ring network cabinet has a simple structure, reliable and safe operation, small maintenance and low operating costs. Compared with a switch cabinet equipped with a circuit breaker, the advantages are outstanding. Ring network cabinets require load switches to have higher performance and smaller size. New load switches have emerged at the historic moment, which in turn has driven the technical progress of ring network cabinets. Today's ring network cabinets not only have excellent performance but are also serialized. This further expands the scope of use of ring network cabinets. ^[2]