Shouke® factory's ring main unit operate by connecting to the primary side of a distribution transformer to act as a substation for the local grid. Its main purpose is to automatically isolate the faulty portion of the distribution network and to restore service by routing power from an alternative source.
The main difference between ring main unit and high-voltage unit lies in their application scope, structural characteristics, protection ability, volume size, price, and purpose.
Overall, high-voltage cabinets are usually used for primary distribution, while ring main cabinets are used for secondary distribution. The volume of the ring main unit is relatively small and usually does not have measuring devices installed, while the high-voltage unit can be considered for future expansion. The maintenance of high-voltage cabinets is relatively intuitive and convenient.
Specifically, the core part of the ring main unit adopts load switches and fuses, which have the advantages of simple structure, small size, low price, improved power supply parameters and performance, and power supply safety. The high-voltage switchgear has functions such as overhead incoming and outgoing lines, cable incoming and outgoing lines, and busbar connection.
In terms of protection capacity, the maximum protection capacity of the ring main unit is a transformer of 1250kVA. High voltage switchgear is suitable for various places such as power plants, substations, petrochemicals, metallurgical steel rolling, light industry textiles, factories, mining enterprises, residential communities, high-rise buildings, etc.
In terms of volume, the width of the ring main unit is generally between 300-500mm, while the most common width for high-voltage cabinets is 550-800mm.
In terms of price, the volume of the ring main unit is small, but it is relatively expensive compared to high-voltage cabinets.
In terms of usage, ring main units are widely used in distribution stations and box type substations in urban residential communities, high-rise buildings, large public buildings, factories and enterprises, and other load centers. High voltage switchgear is suitable for equipment with conduction, control, or protection functions in power generation, transmission and distribution, distribution, energy conversion, and consumption in power supply systems.
In summary, there are significant differences between ring main unit and high-voltage unit in terms of application scope, structural characteristics, protection ability, volume size, price, and purpose. Ring main cabinets are usually used for secondary distribution, with small volume and relatively high price, while high-voltage cabinets are used for primary distribution, with large volume and relatively low price.
