Synchronizing - ABB Relion Technical Manual

1MRK 502 048-UUS A
12.1.7.3
Technical manual
OperationSC = Enabled
TSTSC
BLKSC
OR
BLOCK
AND
VDiffSC
AND
Bus voltage >80%
of GblBaseSelBus
AND
Line voltage >80%
of GblBaseSelLine
FreqDiffA
PhaseDiffA
voltageDifferenceValue
frequencyDifferenceValue
phaseAngleDifferenceValue
ANSI08000018 V2 EN
Figure 164: 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 internally preset
values that are set to be 80% of the set UBase selected for GlbBaseSelBus and
GlbBaseSelLine, which is a supervision that the voltages are both live. Also the voltage
difference is checked to be smaller than the internally preset value 0.10, which is a p.u
value of set voltage base values. If both sides are higher than the preset values and the
Note! Similar logic for Manual Synchrocheck.
AND
AND
0-tSCA
0
50 ms
0
0
AND
80 ms
PhaseDiff > 60°
PhaseDiff < 5°
Section 12
Control
AND
AUTOSYOK
AND
VOKSC
VDIFFSC
1
FRDIFFA
1
PHDIFFA
1
VDIFFME
FRDIFFME
100 ms
INADVCLS
AND
ANSI08000018-2-en.vsd
353