ABB Relion 650 Series Technical Manual page 295

1MRK 506 326-UUS B
OperationSC = Enabled
TSTSC
BLKSC
BLOCK
VDiffSC
Bus voltage >80% of
Vbase
Line voltage >80% of
Vbase
FreqDiffA
PhaseDiffA
voltageDifferenceValue
frequencyDifferenceValue
phaseAngleDifferenceValue
ANSI08000018 V1 EN-US
Figure 147: Simplified logic diagram for the Synchronism check function
10.1.7.3 Synchronizing
When the function is set to
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
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 voltage difference between bus and line is acceptable,
the measured values are also compared with the set values for acceptable frequency
FreqDiffMin , rate of change of frequency FreqRateChange and phase angle, which has to be
and
smaller than the internally preset value of 15 degrees.
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 in the right
moment including the set
incorrect closing pulses. At operation the SYNOK output will be activated with a pulse
and the function reset. The function will also reset if the syncronizing conditions are not fulfilled
within the set
operation for a long time, waiting for conditions to be fulfilled.
Line distance protection REL650
Technical manual
Note! Similar logic for Manual Synchronism check .
OR
0-60 s
AND
t
tSCA
50 ms
AND
t
AND
OperationSynch = Enabled the measuring will be performed.
UBase selected for GlbBaseSelBus and GlbBaseSelLine , which is a
tBreaker time. There is a phase angle release internally to block any
tMaxSynch time. This prevents that the function is, by mistake, maintained in
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AND
AND
AND
AND
1
1
1
ANSI08000018_1_en.vsd
Section 10
Control
AUTOSYOK
VOKSC
VDIFFSC
FRDIFFA
PHDIFFA
VDIFFME
FRDIFFME
SEMOD171603-4 v9
FreqDiffMax
tClosePulse
289