How to distinguish inflatable cabinet, ring main cabinet and central cabinet

  The so-called inflation cabinet is to seal high-voltage components such as bus, circuit breaker, disconnector, transformer, etc
in a shell filled with SF6 or other gases with a lower pressure (0
1 ~ 0
5MPa)
The inflatable cabinet brings many advantages
Its biggest advantage is that it is not affected by the external environment, such as condensation, pollution, small animals and chemical substances
Another advantage is that the use of compressed gas insulation (such as SF6, N, or air) is conducive to miniaturization
The inflation cabinet has oil-free switch with good performance, especially the vacuum switch with no or little maintenance, which greatly reduces the workload of maintenance and overhaul The rated current of the ring main cabinet is not large, so the high-voltage switch of the ring main cabinet generally does not use the circuit breaker with complex structure, but the high-voltage load switch with high-voltage fuse with simple structure
In other words, the high-voltage switch in the ring main cabinet is generally a load switch
The ring main cabinet uses the load switch to operate the normal current, and uses the fuse to cut off the short-circuit current
The combination of the two replaces the circuit breaker
Of course, this can only be limited to a certain capacity
Such switchgear can also be used in the distribution system of non ring network structure There are many types of intermediate cabinets, which can be divided into incoming and outgoing line switchgear, metering cabinet, transformer cabinet, used transformer cabinet, etc
, while the ring main cabinet is the contact switchgear; The switch in the central cabinet can be equipped with an automatic protection device
In case of an accident, the protection device sends a signal to trip the switch and cut off the power supply
VS1 type vacuum switch cabinet is mostly selected in the cabinet, while there is generally no protection device in the ring main cabinet
In case of an accident, the fuse installed inside is overheated and fused to cut off the circuit
The switch is mostly the AC high-voltage load switch in the user — Fuse combination apparatus, or sulfur hexafluoride load switch; Manufacturer of distribution cabinet: http://www
jtcele
com/ High and low voltage distribution cabinet: http://www
jtcele
com/