The Difference Between Inflatable Cabinet And Ring Network Cabinet

There are significant differences between Gas filled cabinet and ring main unit in many aspects. The following are the main differences:

Main body and design
The gas-insulated switch cabinet (C-GIS) is a gas-insulated switch cabinet. Its key components such as main switches, circuit breakers and connections are sealed in a gas box filled with insulating gas, and the external main bus and cable connections are solid insulated. The ring main unit (RMU) is defined according to application characteristics. It is mainly used for ring network power supply. It usually uses a combination of load switches and fuses, and the structure is relatively simple.

Insulating medium
The gas-insulated cabinet uses sulfur hexafluoride (SF6) gas as the insulating medium, which has high insulation performance and safety. The ring main unit usually uses air insulation or semi-insulation, and the insulation performance is relatively low.

Application scenario
The gas-insulated cabinet is suitable for small and medium-sized secondary distribution stations, European box transformers, large shopping malls and other scenarios because of its compact design and high safety. The ring main unit is widely used in urban residential areas, high-rise buildings and factories and enterprises, mainly for ring network power supply.

Functions and features ‌
The inflatable cabinet has the function of connecting and disconnecting the load current, and can also cut off the fault current. The structure is complex and the cost is high. The ring main unit can usually only operate the load switch manually, and lacks the function of automatically cutting off the load current. ‌
Size and weight ‌
The inflatable cabinet is small in size and light in weight due to its compact design. Although the ring main unit also has a compact design, the early versions are mostly common box oil insulation or gas insulation, and the size and weight are relatively large. ‌
In summary, the inflatable cabinet and the ring main unit have significant differences in main design, insulation medium, application scenarios, functional characteristics, size and weight.