![]() It should neither be too slow which may result in damage to the equipment nor should it be too fast which may result in undesired operation. Protective System – What are the Requirements? ¾ Speed The relay must operate at the required speed. Protective Relay – What should it do ? ¾ Monitor system parameters continuously (V, I, P, F) ¾ Operate quickly when necessary (Dependability) ¾ Should not operate wrongly (stability, discrimination) ¾ To eliminate such abnormality by isolating smallest portion of the system in a shortest period of time. ![]() Why we need the Protection ? ¾ To detect abnormalities (faults). Power Evacuation Substation Transmission Substation Switching Substation Distribution Substation
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