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
TSTAUTSY
AUTOSYOK
PHDIFFME
INADVCLS
UDIFFME
PHDIFFA
FRDIFFA
UOKSC
UDIFFSC
OR
t
0-60 s
AND
AND
AND
AND
AND
AND
t
50 ms
UHighLineSC
UHighBusSC
UDiffSC
phaseAngleDifferenceValue
frequencyDifferenceValue
voltageDifferenceValue
1
1
1
AND
tSCA
PhaseDiffA
FreqDiffA
Note! Similar logic for Manual Synchrocheck.
PhDiff > 60°
PhDiff < 5°
AND
32 ms
t
AND
FRDIFFME
100 ms
InvalidSelection
BLOCK
BLKSC
IEC07000114-5-en.vsd
BLOCK
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.
1MRK502052-UEN B
Section 14
Control
633
Technical manual
Summary of Contents for Relion REG670
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