Table 316:
SAPFRC Output signals
Name
Type
Description
TRIP
BOOLEAN
Operate/trip signal for frequency gradient
START
BOOLEAN
Start/pick-up signal for frequency gradient
RESTORE
BOOLEAN
Restore signal for load restoring purposes
BLKDMAGN
BOOLEAN
Blocking indication due to low amplitude
10.3.5
Settings
Table 317:
SAPFRC Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Off
On
-
-
Off
Operation Off / On
StartFreqGrad
-10.00 - 10.00
Hz/s
0.01
0.50
Frequency gradient start value, the sign
defines direction
tTrip
0.000 - 60.000
s
0.001
0.200
Operate time delay in positive / negative
frequency gradient mode
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
10.3.6
Monitored data
Table 318:
SAPFRC Monitored data
Name
Type
Values (Range)
Unit
Description
STARTDUR
REAL
-
%
Start duration in percents
of the total operation time
10.3.7
Operation principle
Rate-of-change frequency protection SAPFRC is used to detect fast power system
frequency changes at an early stage. SAPFRC 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 from the preprocessing
function. If the voltage is lower than the set blocking voltage in the preprocessing
function the function is blocked and no START or TRIP signal is issued. If the
frequency recovers, after a frequency decrease, a restore signal is issued.
Section 10
1MRK502052-UEN B
Frequency protection
554
Technical manual
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