Signals; Settings; Operation Principle - ABB REG650 Technical Manual

1MRK 502 034-UEN -
9.3.4
9.3.5
Table 168: SAPFRC Group settings (basic)
Name Values (Range)
Operation
StartFreqGrad
tTrip
RestoreFreq
tRestore
9.3.6
Technical Manual

Signals

Table 166: SAPFRC Input signals
Name
U3P
BLOCK
Table 167: SAPFRC Output signals
Name
TRIP
START
RESTORE
BLKDMAGN

Settings

Unit
Off -
On
-10.00 - 10.00 Hz/s
0.000 - 60.000 s
45.00 - 65.00 Hz
0.000 - 60.000 s

Operation principle

Rate-of-change frequency protection SAPFRC is used to detect fast power system
frequency changes, increase as well as, decrease 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 that is, 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.
Type Default Description
GROUP - Three phase group signal for voltage inputs
SIGNAL
BOOLEAN 0 Block of function
Type Description
BOOLEAN Operate/trip signal for frequency gradient
BOOLEAN Start/pick-up signal for frequency gradient
BOOLEAN Restore signal for load restoring purposes
BOOLEAN Blocking indication due to low amplitude
Step Default
- Off
0.01 0.50
0.001 0.200
0.01 49.90
0.001 0.000
Section 9
Frequency protection
Description
Operation Off / On
Frequency gradient start value, the sign
defines direction
Operate time delay in positive / negative
frequency gradient mode
Restore is enabled if frequency is above
set frequency value
Restore time delay
263