PID-6754-OUTPUTSIGNALS v2
Table 173:
SAPFRC (81R) Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip signal
PICKUP
BOOLEAN
Pickup signal
RESTORE
BOOLEAN
Restore signal for load restoring purposes
BLKDMAGN
BOOLEAN
Blocking indication due to low magnitude
10.3.5
Settings
PID-6754-SETTINGS v2
Table 174:
SAPFRC (81R) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Operation Disabled/Enabled
PUFreqGrad
-10.00 - 10.00
Hz/s
0.01
0.50
Frequency gradient pick up value, the sign
defines direction
IntBlockLevel
0.0 - 100.0
%VB
1.0
50.0
Internal blocking level in % of VBase
tDelay
0.000 - 60.000
s
0.001
0.200
Operate time delay
RestoreFreq
45.00 - 65.00
Hz
0.01
49.90
Restore frequency value
tRestore
0.000 - 60.000
s
0.001
0.000
Restore time delay
tReset
0.000 - 60.000
s
0.001
0.000
Time delay for reset
Table 175:
SAPFRC (81R) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 12
-
1
1
Selection of one of the Global Base Value
groups
10.3.6
Operation principle
M14970-3 v9
Rate-of-change frequency protection SAPFRC (81) is used to detect fast power system
frequency changes at an early stage. SAPFRC (81) has a settable definite time delay. If
the rate-of-change of frequency remains below the set value, for negative rate-of-
change, for a time period equal to the chosen time delay, the TRIP signal is issued. If
the rate-of-change of frequency remains above the set value, for positive rate-of-
change, for a time period equal to the chosen time delay, the TRIP signal is issued. To
avoid an unwanted trip due to uncertain frequency measurement at low voltage
magnitude a voltage controlled blocking of the function is available, that is, if the
voltage is lower than the set blocking voltage
IntBlockLevel
the function is blocked and
Section 10
1MRK 511 408-UUS A
Frequency protection
314
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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