ABB Relion 670 Series Technical Reference Manual page 624

Section 12
Control
618
OperationSC = Enabled
TSTSC
BLKSC
OR
BLOCK
AND
VDiffSC
AND
VHighBusSC
AND
VHighLineSC
FreqDiffA
PhaseDiffA
voltageDifferenceValue
frequencyDifferenceValue
phaseAngleDifferenceValue
ANSI07000114 V3 EN
Figure 309: Simplified logic diagram for the Auto Synchronism function
Synchronizing
When the function is set to OperationSynch = Enabled the measuring will be performed.
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
VDiffSynch, which is a p.u 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
Note! Similar logic for Manual Synchronism check.
AND
AND
tSCA
0-60 ms
0
50 ms
0
AND
0
PhDiff > 60°
32 ms
PhDiff < 5°
1MRK505222-UUS C
AND
AUTOSYOK
AND
VOKSC
VDIFFSC
1
FRDIFFA
1
PHDIFFA
1
VDIFFME
FRDIFFME
100 ms
INADVCLS
AND
ANSI07000114-3-en.vsd
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