Various Types of Circuit Breakers used in Power System for Smooth Working of the Transmission Line

Once a power system is established it is necessary to protect it from faults (whether internal or external). So we use some protecting and sensing device like circuit breakers, Relays, Fuses etc. Circuit breaker is a mechanical device capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time. This paper represents information about the basic types and electrical characteristics of circuit breaker based on medium used for arc quenching, that how it automatically breaks currents under specified abnormal circuit conditions such as those of faults. The insulating medium in which circuit interruption is performed is designated by suitable prefix, such as oil circuit breaker, air –break circuit breaker, air blast circuit breaker, sulphur hexafluoride (SF6) circuit breaker, vacuum circuit breaker.