ABB Relion 670 Series Technical Reference Manual page 625

1MRK505222-UUS C
Technical reference manual
FreqDiffMax and FreqDiffMin, rate of change of frequency FreqRateChange, phase
angle, which has to be 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 tBreaker time. There is a phase angle
release internally to block any incorrect closing pulses. At operation the SYNOK
output will be activated with a pulse tClosePulse and the function resets. The function
will also reset if the synchronizing conditions are not fulfilled within the set tMaxSynch
time. This prevents that the function is, by mistake, maintained in operation for a long
time, waiting for conditions to be fulfilled.
The inputs BLOCK and BLKSYNCH are available for total block of the complete
SESRSYN function and block of the Synchronizing function respectively.
TSTSYNCH will allow testing of the function where the fulfilled conditions are
connected to a separate output.
SYN1
OPERATION SYNCH=ON
TEST MODE=ON
STARTSYN
BLKSYNCH
OR
VDiffSynch
VHighBusSynch
AND
VHighLineSynch
FreqDiffMax
FreqDiffMin
FreqRateChange
fBus&fLine ± 5Hz
Phase Diff < 15 deg
PhaseDiff=closing angle
FreqDiff
Close pulse
tBreaker in advance
ANSI06000636 V3 EN
Figure 310: Simplified logic diagram for the synchronizing function
S
AND
R
50 ms
AND
t
AND
tClose
Pulse
AND
AND
Section 12
Control
SYNPROGR
AND
SYNOK
OR
TSTSYNOK
OR
tMax
Synch
SYNFAIL
ANSI06000636-3-en.vsd
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