What is the ring network cabinet application and classification?
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ã€Ring cabinet classification】
Ring Main Units are generally classified into three types: air insulation, solid insulation and SF6 insulation. They are used to divide the load current, break the short-circuit current and the transformer no-load current, and to control the charging current of overhead lines and cable lines from a certain distance. And the protection function is an important switchgear for ring power supply and terminal power supply. In the cabinet, air-insulated load switches are mainly gas-produced, air-injected, and vacuum-typed. The SF6-insulated load switch is SF6 type. Since the SF6 gas is enclosed in the housing, the cut-off fracture it forms is not visible. The load switch in the RMU is generally required to have three stations, that is, to cut off the load, isolate the circuit, and reliably ground. Gas-producing, air-pressure and SF6 type load switches are easy to implement three-position, and vacuum interrupter can only be broken, can not be isolated, so the general vacuum load ring network switch cabinet before the load switch and then add a disconnector to Form a fracture.
[Ring Appliance Application]
From the perspective of power supply and distribution, with medium and small-sized capacity, most of the distribution transformers are generally not more than 1250 KVA, providing stable long-term power supply, and high-voltage switches are not frequently operated. For such users, the performance of the RMU is not perfect, but it is enough to be competent. With large-scale urban construction, a large number of large-scale high-rise buildings have been erected. The substations are often located downstairs. According to the requirements of fire protection, the substations must be “oil-free†and they should be used rationally according to the construction area. Transformer and distribution equipment should be “small-sizedâ€, so the ring-network cabinet or vacuum circuit breaker, dry-type transformer and dry-type transformer enter the building. The ring network cabinet has a simple structure, reliable and safe operation, low maintenance, and low operating costs. Compared with a switchgear equipped with a circuit breaker, the advantages are prominent. RMUs require load switches with higher performance and smaller size. New load switches come into being. This in turn drives the technical progress of RMUs. Today's RMUs not only perform well but are serialized. This further expands the use of RMUs. 
[Ring cabinet protection requirements]
Scope of application: Mainly applicable to 10KV and other user projects;
Protection unit: line, main transformer backup, motor, capacitor, reactor, self-preparation, PT, non-electricity;
Product appearance: Ultra-thin body within 100mm is especially suitable for cabinets such as RMUs, etc.
Product material: alloy shell, anti-electromagnetic interference test in line with national standards;
Operating circuit: Without anti-jump, it can be used with various switches with self-defense;
Communication: Optional with or without RS485 communication interface.
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