ABB Relion 650 Series Technical Manual page 144

Section 8
Control
138
OperationSC = On
invalidSelection
OR
UDiffSC
UHighBusSC
UHighLineSC
FreqDiffA
PhaseDiffA
voltageDifferenceValue
frequencyDifferenceValue
phaseAngleDifferenceValue
IEC07000114 V6 EN-US
Figure 54: Simplified logic diagram for the auto synchrocheck function
Synchronizing
When the function is set to OperationSynch = On the measuring will be performed.
The function will compare the values for the bus and line voltage with the set
values for UHighBusSynch and UHighLineSynch, which is a supervision that the
voltages are both live. Also the voltage difference is checked to be smaller than the
set value for UDiffSynch, 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 CloseAngleMax.
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
Note! Similar logic for Manual Synchrocheck.
AND
AND
0-60 s
AND
t
tSCA
50 ms
AND
t
AND
32 ms
AND
PhDiff > 60°
PhDiff < 5°
1MRK 511 424-UEN B
TSTAUTSY
AND
AUTOSYOK
AND
UOKSC
UDIFFSC
1
FRDIFFA
1
PHDIFFA
1
UDIFFME
FRDIFFME
PHDIFFME
100 ms
INADVCLS
t
AND
IEC07000114-6-en.vsdx
SEMOD171603-4 v12
Bay control REC650 2.2 IEC
Technical manual