ABB Relion 670 series, Technical Reference Manual

Page: 625 / 1232

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.
OR
AND
S
R
VDiffSynch
VHighBusSynch
VHighLineSynch
FreqDiffMax
FreqDiffMin
FreqRateChange
AND
t
50 ms
AND
AND
AND
AND
tClose
Pulse
OR
AND
OR
SYN1
STARTSYN
BLKSYNCH
SYNPROGR
SYNOK
SYNFAIL
tMax
Synch
TSTSYNOK
ANSI06000636-3-en.vsd
OPERATION SYNCH=ON
TEST MODE=ON
fBus&fLine ± 5Hz
Phase Diff < 15 deg
PhaseDiff=closing angle
FreqDiff
tBreaker
Close pulse
in advance
ANSI06000636 V3 EN
Figure 310: Simplified logic diagram for the synchronizing function
1MRK505222-UUS C
Section 12
Control
619
Technical reference manual