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Explain the working principle of Vacuum circuit breaker and
Air circuit breaker
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Answer Posted / jobmon jacob
Vacuum is an excellent insulating medium. Arc is formed at the instant of contact separation from which metal vapour shoot off, constituting plasma. The cotact material are selected in such a way that the chopping current is very minimum. With alternating current arc, the current decreases during a portion of wave and tends to zero. . Soon after natural
current zero, the remaining metal vapour condenses and the
dielectric strength builds up rapidly, and restriking of
arc is prevented.A small portion of metal is exhausted during this process.This is used for Medium voltages.ACB is in low voltages.Here air is the quenching medium.
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