ANSI07000114-4-en.vsd
OperationSC = Enabled
TSTSC
BLKSC
BLOCK
T
S
T
A
U
T
S
Y
AUTOSYOK
P
HDI
F
F
M
E
FRDIFFME
VDIFFME
PHDIFFA
FRDIFFA
VOKSC
VDIFFSC
OR
AND
AND
AND
AND
AND
AND
VHighLineSC
VHighBusSC
VDiffSC
phaseAngleDifferenceValue
frequencyDifferenceValue
voltageDifferenceValue
1
1
1
AND
tSCA
PhaseDiffA
FreqDiffA
50 ms
0
0-60 ms
0
Note! Similar logic for Manual Synchronism check.
INADVCLS
PhDiff > 60°
PhDiff < 5°
AND
AND
100 ms
32 ms
0
ANSI07000114 V4 EN-US
Figure 399: Simplified logic diagram for the Auto Synchronism function
Synchronizing
SEMOD171603-4 v12.1.1
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
FreqDiffMax
and
FreqDiffMin
, rate of change of 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
tBreaker
time. The calculation of the operation pulse sent in
advance is using the measured
SlipFrequency
and the set
tBreaker
time. To prevent incorrect
1MRK 502 066-UUS B Section 14
Control
755
Technical manual
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