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Sunday, August 4, 2019

Working Principle of Oil Circuit Breaker


During the normal operating conditions, the contact of the oil circuit breaker is closed and carry the current. When the fault occurs in the system, the contacts of the breaker are moving apart, and an arc is struck between the contacts.


Due to this arc, a large amount of heat is liberated, and a very high temperature is reached which vaporises the surrounding oil into gas. The gas, thus liberated surrounds the arc and its explosive growth around it displace the oil violently. The arc is extinguished when the distance between the fixed and moving contact reaches a certain critical value, depends on the arc current and recovery voltage.

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