Thursday, January 12, 2012

Division of power system into protective zones


The function of relay and circuit-breakers in the operation of a power system is to prevent or limit damage during fault or overloads and minimize their effect on the remainder of the system.  This is accomplished by dividing the system into protective zones separated by circuit breakers, each having its protective relays for determining the existence of a fault in that zone.
In addition to its protective function, a circuit breaker is also used for circuit switching under normal conditions.  It is desirable to restrict the amount of system disconnected by a given fault. This principle is defined as the selectivity of the protective gear.


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