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Ring Main Unit(RMU) are now widely used to protect MV/LV transformers as well as construct Loop distribution system. It uses SF6 gas for insulation and therefore it can possible to make compact switchgear and maintenance free due to tightness tank structure. It consists of Load Break Switch(LBS), Fuse combination switch and Circuit Breaker(CB) including Vacuum Interrupter(VI). Especially, a RMU using...
Vacuum Circuit Breaker (VCB) consists of the main frame with the operating mechanism and the main circuits including VI (Vacuum Interrupter). Especially, a VCB for the generator protection, which is used in a power plant, requires very large contact spring force because it has to be able to withstand the high short circuit current. In order to release closing energy of VCB, the cam type mechanism...
The VCB(Vacuum Circuit Breaker) have three main circuits which contain the VI(Vacuum Interrupter) and has the main frame unit as an operating mechanism. The operating mechanism generally uses a spring energy for movement of heavy linkages and electric contacts in the VI. In order to reliably cut off the breaking current, electric contacts are separated as fast as possible. Generally, the opening speed...
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