ABB REG670 Technical Manual page 639

1MRK502052-UEN B
Technical manual
A number of outputs are available as information about fulfilled checking conditions.
UOKSC shows that the voltages are high, UDIFFSC, FRDIFFA, FRDIFFM,
PHDIFFA, PHDIFFM shows when the voltage difference, frequency difference and
phase angle difference conditions are out of limits.
Output INADVCLS, inadvertent circuit breaker closing, indicates that the circuit
breaker has been closed at wrong phase angle by mistake. The output is activated, if
the voltage conditions are fulfilled at the same time the phase angle difference
between bus and line is suddenly changed from being larger than 60 degrees to smaller
than 5 degrees.
OperationSC = On
TSTSC
InvalidSelection
OR
BLOCK
UDiffSC
UHighBusSC
UHighLineSC
FreqDiffA
PhaseDiffA
voltageDifferenceValue
frequencyDifferenceValue
phaseAngleDifferenceValue
IEC07000114 V5 EN
Figure 297: Simplified logic diagram for the Auto Synchrocheck function
Synchronizing
When the function is set to OperationSynch = On the measuring will be performed.
Note! Similar logic for Manual Synchrocheck.
0-60 s
AND
t
tSCA
50 ms
AND
t
AND
AND
PhDiff > 60°
PhDiff < 5°
Section 14
AND
AND
AND
AND
1
1
1
32 ms
100 ms
t
AND
IEC07000114-5-en.vsd
Control
AUTOSYOK
UOKSC
UDIFFSC
FRDIFFA
PHDIFFA
UDIFFME
FRDIFFME
PHDIFFME
INADVCLS
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