PROTECTION

PROTECTION ZONE OF PROTECTION The idea of an area of responsibility of a protection system mentioned above has been formalized by assigning zones of protection to various protection systems. This concept of zones help to define the reliability requirements for different protection systems. Each breaker is included in two neighbouring zones of protection. The boundry of each zone defines a portion of the power system such that for a fault anywhere within that zone, the protection system responsible for that zone takes action to isolate everything within that zone from the rest of the system. The CB. Circuit Breaker help to define the boundries of the zones of protection. This is because at each point where connection is made b/w equipment inside the zone and the rest of the power system, a CB. Is or should be inserted because isolation under faulted condition is achieved through a CB. Neighbouring zones always overlap. This is important so that small parts of the system do not get left out without protection. The region of overlap is however made as small as possible to reduce very large disruptions to the system.