PKR39809-02

Rate of Change of Frequency

Rate of Change of Frequency (ROCOF) is a separate protection element on the PowerLogic ADVC Controller and operates independently of UOF protection elements. It does however utilize some UOF protection settings for Blocking, Frequency Normal, and Minimum Voltage functions.

When a large imbalance occurs between the generated power and the load demand it can cause the system frequency to change rapidly. A ROCOF function can be used to detect a loss of grid associated with the appreciable loss of load. It can also be used for fast load shedding by speeding up operational time in UOF situations.

ROCOF operation is based on the calculation of the frequency variation (df/dt).

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