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The possibility of inter-connection breakdown, limination of spinning reserves and the dangers of under-frequency operation indicate that properly co-ordinated load-shedding scheme is essential for adequate system protection. Although load shedding involves a deliberate service interruption, something which one would always like to avoid, it is invaluable to system security since it would become effective only when there is no other remedy available to save the system.
The frequency of AC voltage of power supply network is normally maintained constant at the declared level within statutory limits of variation. In conditions of emergency plant outage, excessive overload on the network, short-circuit in the system etc., a large variation in frequency may occur. Excessive or rapid variation of frequency may cause a variety of damage to generating plant, damage to industrial machinery, burn-out of domestic appliances and dislocation in traffic signaling system, etc. We not only measure the stages of progress but.