The role and application scope of the ring network cabinet. The network cabinet has not appeared for a long time, but it has been widely used in recent years, mainly due to the new development of industrial enterprises and institutional buildings. From the perspective of power supply and distribution, the small and medium-sized capacity generally does not exceed 1250KVA, the power supply is stable for a long time, and the high-voltage switch operation is not frequent. For these users, although the performance of the ring network cabinet is not the most perfect, it is competent enough.
With the large-scale urban construction, a large number of large high-rise buildings often have their power transformation and distribution equipment located downstairs. According to fire protection requirements, the power transformation and distribution equipment must be oil-free and used reasonably according to the construction area. The power transformation and distribution equipment should be small, so the ring network cabinet or vacuum circuit breaker, dry transformer, and dry transformer enter the building board. The ring network cabinet has a simple structure, reliable and safe operation, minimal maintenance, and low operating cost. Compared with switchgear equipped with circuit breakers, it has outstanding advantages. Essentially, it is a load switch cabinet, but it is called a ring network cabinet because it is used for ring network power supply. The ring network cabinet has a relatively simple structure and relatively low price, and is commonly used for power distribution and line protection. There are many classification methods for ring network cabinets, and the following are the functions and classifications of ring network cabinets.
1. Functional classification of ring network cabinets.
The function of the ring network cabinet is to connect the ring network lines and improve the power supply reliability of the ring network lines for closed operation or load cutting. The usage and classification of ring network cabinets in the ring network vary slightly, mainly including incoming ring network cabinets. There are ring network cabinets and connecting ring network cabinets.
2. Classification of load switches for ring main cabinets.
The main electrical components of the ring main unit are load switches and circuit breakers. According to the different load switches, the ring main unit can be divided into vacuum load switches and sulfur hexafluoride load switches. At present, SF6 load switches are more common in ring main cabinets because they are easy to achieve three working positions, namely connection, disconnection, and grounding.
3. Classification of application environments for ring network cabinets.
According to the application environment, ring network cabinets can be divided into indoor and outdoor ring network cabinets. Indoor ring network cabinet is used for high-voltage side distribution. If necessary, circuit breakers can also be installed to ensure the smooth and safe operation of the power grid. The indoor ring network cabinet mainly consists of incoming cabinet, metering cabinet, PT cabinet, transformer outgoing cabinet, etc.
Outdoor ring network cabinet is a ring network cabinet used in urban power grids, mainly using SF6 insulation and load switches. The outdoor ring network cabinet has a high anti-corrosion level, has certain waterproof and moisture-proof performance, and can withstand complex outdoor working environments.
