Settings - ABB RES670 Technical Manual

Section 10
Frequency protection
10.3.5
Table 174: SAPFRC (81R) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
PUFreqGrad -10.00 - 10.00
IntBlockLevel 0.0 - 100.0
tDelay 0.000 - 60.000
RestoreFreq 45.00 - 65.00
tRestore 0.000 - 60.000
tReset 0.000 - 60.000
Table 175: SAPFRC (81R) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 12
10.3.6
314
Table 173: SAPFRC (81R) Output signals
Name Type
TRIP BOOLEAN
PICKUP BOOLEAN
RESTORE BOOLEAN
BLKDMAGN BOOLEAN

Settings

Unit Step
- -
Hz/s 0.01
%VB 1.0
s 0.001
Hz 0.01
s 0.001
s 0.001
Unit Step
- 1
Operation principle
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
Description
Trip signal
Pickup signal
Restore signal for load restoring purposes
Blocking indication due to low magnitude
Default Description
Disabled Operation Disabled/Enabled
0.50 Frequency gradient pick up value, the sign
defines direction
50.0 Internal blocking level in % of VBase
0.200 Operate time delay
49.90 Restore frequency value
0.000 Restore time delay
0.000 Time delay for reset
Default Description
1 Selection of one of the Global Base Value
groups
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
PID-6754-OUTPUTSIGNALS v2
PID-6754-SETTINGS v2
M14970-3 v9
Technical manual