The principle function of protective relaying is to cause the prompt removal from service of any  element of  the power system when  it starts  to operate  in an abnormal manner or  interfere with  the  effective  operation  of  the  rest  of  the  system.  In  order  that  protective  relay  system  may  perform this function satisfactorily, it should have the following qualities: (i)  selectivity (ii) speed (iii) sensitivity (iv) reliability (v) simplicity (vi) economy (i) Selectivity – It is the ability of the protective system to select correctly that part of the system  in trouble and disconnect the faulty part without disturbing the rest of the system  A well-designed and efficient relay system should be selective i.e. it should be able to detect read more

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