PKR39809-02

Over Frequency Protection Operation

When the measured frequency rises above the Over Frequency Trip At setting an OF Pickup occurs and a TDC is started.

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

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

When Normal Frequency Close is Off, the ACR will go immediately to Lockout following an Under or Over Frequency trip.

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