PKR39809-02

Under Frequency Protection Operation

When the measured frequency drops below the Under Frequency Trip At setting an UF Pickup occurs and a Trip Delay Counter (TDC) is started.

The TDC will reset if the frequency rises back above the Under Frequency Trip At threshold plus the 0.2 Hz dead-band before the number of cycles configured for Under Frequency Trip After have occurred.

Otherwise Under Frequency protection will send a trip request to the switchgear after the configured Under Frequency Trip After number of cycles.

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