ABB RELION 670 Series Technical Manual page 761

1MRK 502 066-UUS B
OperationSC = Enabled
TSTSC
BLKSC
BLOCK
VDiffSC
VHighBusSC
VHighLineSC
FreqDiffA
PhaseDiffA
voltageDifferenceValue
frequencyDifferenceValue
phaseAngleDifferenceValue
ANSI07000114 V4 EN-US
Figure 399: Simplified logic diagram for the Auto Synchronism function
Synchronizing
When the function is set to
The function will compare the values for the bus and line voltage with the set values for
VHighBusSynch and VHighLineSynch , which is a supervision that the voltages are both live. Also
the voltage difference is checked to be smaller than the set value for
value of set voltage base values. If both sides are higher than the set values and the voltage
difference between bus and line is acceptable, the measured values are compared with the set
values for acceptable frequency
FreqRateChange and phase angle, which has to be smaller than the internally preset value of 15
degrees.
The measured frequencies between the settings for the maximum and minimum frequency will
initiate the measuring and the evaluation of the angle change to allow operation to be sent at the
right moment including the set
advance is using the measured
Technical manual
Note! Similar logic for Manual Synchronism check.
OR
tSCA
AND
0-60 ms
0
AND
50 ms
0
AND
PhDiff > 60°
PhDiff < 5°
OperationSynch = Enabled the measuring will be performed.
FreqDiffMax and FreqDiffMin , rate of change of frequency
tBreaker time. The calculation of the operation pulse sent in
SlipFrequency and the set tBreaker time. To prevent incorrect
AND
AND
AND
AND
100 ms
AND
0
AND
32 ms
Section 14
AUTOSYOK
VOKSC
VDIFFSC
1
FRDIFFA
1
PHDIFFA
1
VDIFFME
FRDIFFME
INADVCLS
ANSI07000114-4-en.vsd
SEMOD171603-4 v12.1.1
VDiffSynch , which is a p.u
Control
755