Oil circuit breakers are the oldest type of circuit breakers. The separating contacts of the oil circuit breakers are made to separate within the insulating oil which has better insulating properties than air. On the occurrence of the fault as the breaker contacts open under the oil, an arc is struck between the breaker contacts and the heat of the arc evaporates the surrounding oil and dissociates into a substantial volume of gaseous hydrogen (hydrogen gas with a small percentage of methane, ethylene and acetylene) at high pressure.
Oil Circuit breakers have the virtues of reliability, simplicity and relative cheapness. In order to determine the advantages of oil circuit breakers, advantages and disadvantages of oil as a arc quenching medium should be understood
Advantages:
Disadvantages:
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