function of protective relying
the various functions of protective relaying are :
1- the prompt removal of the component which is behaving abnormally by closing the trip circuit of circuit breaker or to sound an alarm
2- to disconnect the abnormally operating part so as to avoid the damage or interference within effective operation of the rest of system
3- to prevent the subsequent faults by disconnecting the abnormally operating part
4- to disconnet the faulty part as quickly as possible so as to minimize the damage to the faulty part itself. for example, there is a winding fault in a machine and if it presists for a long time then there is a possibility of the damage of the entire winding. as against this, if it is disconnected quickly then only few coils may get damage instead of entire winding
5- to restrict the spreading of the effect of fault causing least interference to the rest of the healthy system. thus by disconnecting the faulty part, the fault effects get localised
6- to improve the system performance, system reliability, system stability and service continuity.
the fault can not be completely avoided but can be minimized. thus thr protective relying plays an important role in sensing the faults, minimizing the effects of faults and minimizing the damage due to the faults
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