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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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