User Manual Chapter 1
GFK-2749A Jan 2020
PSM Module Description and Specifications 17
ANSI 81O – Over-frequency Protection
Detection of abnormally high frequency compared to the nominal frequency, to monitor
power supply quality. The alarm will be triggered if a circuit’s frequency is above the nominal
frequency plus OVER_FRQ_THR for a time period longer than OVER_FRQ_DELAY. The alarm
will be cleared when a circuit’s frequency falls below the nominal frequency plus
OVER_FRQ_THR for a time period longer than OVER_FRQ_DELAY. OVER_FREQ_THR is an
absolute frequency, in Hz, that is added to the nominal frequency to determine the highest
acceptable frequency for the grid.
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