8.1.4 Signals
Table 135: SAPTUF (81) Input signals
Name
Type Default Description
V3P GROUP
SIGNAL
- Three phase group signal for voltage inputs
BLOCK BOOLEAN 0 Block of function
Table 136: SAPTUF (81) Output signals
Name Type Description
TRIP BOOLEAN Common trip signal
PICKUP BOOLEAN General pickup signal
RESTORE BOOLEAN Restore signal for load restoring purposes
BLKDMAGN BOOLEAN Measurement blocked due to low voltage amplitude
8.1.5 Settings
Table 137: SAPTUF (81) Group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
PUFrequency 35.00 - 75.00 Hz 0.01 48.80 Frequency set value
tDelay 0.000 - 60.000 s 0.001 0.200 Operate time delay
tRestore 0.000 - 60.000 s 0.001 0.000 Restore time delay
RestoreFreq 45.00 - 65.00 Hz 0.01 49.90 Restore frequency if frequency is above
frequency value
8.1.6 Monitored data
Table 138: SAPTUF (81) Monitored data
Name
Type Values (Range) Unit Description
FREQ REAL - Hz Measured frequency
8.1.7 Operation principle
The underfrequency protection (SAPTUF, 81) function is used to detect low power
system frequency. If the frequency remains below the set value for a time period greater
Section 8 1MRK 511 287-UUS A
Frequency protection
192
Technical manual
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