The difference between ring main unit and switchgear
Apr 08, 2022
The switchgear is divided into two types: high and low voltage. High voltage includes ring main unit, middle cabinet, GG1A, etc. There are also many types of ring main units.
The ring main unit means that each power distribution sub-bureau has a switch cabinet (outgoing switch cabinet), and the busbar of this switch cabinet is also a part of the ring trunk. That is, the cylinder is made up of the busbars of each outlet cabinet. Each outlet cabinet is called a "ring main unit".
In fact, if you take out a ring main unit alone, you cannot see the meaning of "ring network". These ring main units are not large, so the high-voltage switch of the ring main unit generally does not use a circuit breaker with a complex structure, but a high-voltage load switch with a simple structure and a high-voltage fuse.
That is to say, the high-voltage switch in the ring cabinet is generally a load switch. The circuit cabinet uses a load switch to operate the normal current and a fuse to remove the short circuit current. The two combine to replace circuit breakers. Of course, this can only be limited to a certain capacity.
