Selectivity or discrimination
Fast operation (Speed)
Fig. 1.5 Single line diagram of a typical power system
Selectivity or discrimination:-
Speed (Fast operation):-
Electrical apparatus may get damaged or get burned if they are made to carry the fault currents for a long time.
Reduction in the system voltage which shutdown consumers, loss of industrial loads and also motors & the generators on the system may become unstable.
The high speed relay system decreases the possibility of development of one type of fault into another more severe type.
Rating of the protected machine
Location of the protected machine
Probability of abnormal condition due to internal and external causes
Cost of machine
Continuity of supply as affected by failure of supply
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