PKR39809-02

UOF Protection Applications

Under Frequency protection can be used in a Load Shedding scheme to help restore system frequency when it has dropped due to an overload of the system. By configuring different U/F trip settings for each ACR in the scheme they can be made to progressively trip to shed load as the system frequency falls. Using Normal Frequency Close with different Under Frequency Normal settings the load can be progressively restored as the frequency recovers.

Over Frequency protection can be used as a type of Over-speed protection for generating plant.

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