A circuit breaker is a device used in electrical power system for breaking or making of a network. This is required when there is a maintenance work needed or when there occurs a fault in the network. For the second case the circuit breaker operates automatically when the relay coil trips. During the operation of a circuit breaker an arc is formed when the contacts move away from each other. To quench this arc different dielectric mediums of high dielectric strengths are used. The most common insulating medium used in the circuit breakers is SF6 gas.
The contacts are kept in a chamber filled with SF6 gas at high pressure (may be up to 14kg/m2). SF6 gas is very useful for quenching the arc for its high dielectric strength and electro negativity. This types of circuit breakers are called SF6 circuit breaker.
No comments:
Post a Comment