GE MiCOM P40 Agile Technical Manual page 281

Feeder management ied
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P14x
maintained. These time settings are system dependent; higher or lower settings may be required depending on the
particular application.
It is possible to set up restoration schemes involving multiple frequencies. This allows faster restoration of loads,
but there is the possibility of continuous system operation at frequencies far removed from the nominal. A typical
scheme using two frequencies is illustrated below:
Restore Freq. Restoration Frequency
Stage
Setting (Hz)
1
49.5 Hz
2
49.5 Hz
3
49.0 Hz
4
49.0 Hz
Staggered time settings may be used in this scheme as well, but the time separation among the restoration of
stages will be a function of the frequency recovery pattern. Time coordinated restoration can only be guaranteed
for those stages with a common restoration frequency setting.
P14xEd1-TM-EN-1
Chapter 11 - Frequency Protection Functions
Restore DelayRestoration Time Delay
(S)
120 sec
60 sec
120 sec
60 sec
Holding Time Delay (S)
20 sec
20 sec
20 sec
20 sec
255

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