Signals - ABB Relion Technical Manual

Section 10
Frequency protection
10.1.4
10.1.5
Table 186: SAPTUF (81) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
PUFrequency 35.00 - 75.00
tDelay 0.000 - 60.000
tRestore 0.000 - 60.000
RestoreFreq 45.00 - 65.00
10.1.6
10.1.7
320

Signals

Table 184: SAPTUF (81) Input signals
Name Type
V3P GROUP
SIGNAL
BLOCK BOOLEAN
Table 185: SAPTUF (81) Output signals
Name Type
TRIP BOOLEAN
PICKUP BOOLEAN
RESTORE BOOLEAN
BLKDMAGN BOOLEAN
Settings
Unit Step
- -
Hz 0.01
s 0.001
s 0.001
Hz 0.01
Monitored data
Table 187: SAPTUF (81) Monitored data
Name Type
FREQ REAL
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
Default Description
- Three phase group signal for voltage inputs
0 Block of function
Description
Common trip signal
General pickup signal
Restore signal for load restoring purposes
Measurement blocked due to low voltage amplitude
Default Description
Disabled Disable/Enable Operation
48.80 Frequency set value
0.200 Operate time delay
0.000 Restore time delay
49.90 Restore frequency if frequency is above
frequency value
Values (Range) Unit
- Hz
1MRK 502 048-UUS A
Description
Measured frequency
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