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Vacuum Circuit Breaker Operation And Applications 2011-12-26
A typical vacuum circuit breaker consists of a fixed contact, moving contact and an arc shield mounted inside a vacuum chamber. from Vacuum Circuit Breaker Supplier ,A control mechanism is connected to the movable member by stainless steel bellows. This is done to avert possibilities of leakage. The outer insulation body in a vacuum circuit breaker comprises a glass vessel or ceramic vessel. In addition, an arc shield is also included to control internal dielectric strength. This serves to prevent metallic vapors from falling onto the surface of the outer insulating cover.
Vacuum Circuit Breaker Operation
A vacuum circuit breaker from Earthing Switches Manufacturer operates by moving its flexible contacts separate from its fixed contacts. An arc struck between contacts is produced from an ionization process. Metal ions produced vary depending on the materials used for the contacts. When an arc is produced, it is quickly extinguished and taken up by moving contact members and shields. A vacuum environment has a remarkably fast rate of recovery of dielectric strength. This explains the fast rate of extinction of the produced arc within a short contact separation in a vacuum circuit breaker.
Vacuum Circuit Breaker Applications
Vacuum Circuit Breaker, oil-quenched breakers and air-blast breakers all perform well in transmission line applications where they trip off only occasionally. In transmission line protection applications, all three types require only minimal maintenance. Vacuum breakers perform slightly less well than other types in handling line spikes and surges without tripping off, but perform better than other types in applications such as powering arc furnaces where high-voltage current must frequently be connected and disconnected.
Operating Mechanism
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