ABB REG650 Technical Manual page 332

Section 12
Control
326
difference between bus and line is acceptable, the measured values are also 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.
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 reset. The function
will also reset if the syncronizing 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
Disabled
Enabled
TEST MODE
Disabled
Enabled
STARTSYN
BLKSYNCH
OR
Voltage difference between
V-Bus and V-Line < 0.10 p.u
Bus voltage > 80% of
AND
GblBaseSelBus
Line voltage > 80% of
GblBaseSelLine
FreqDiffMax
FreqDiffMin
FreqRateChange
fBus&fLine ± 5 Hz
PhaseDiff < 15 deg
PhaseDiff=closing angle
ANSI08000020 V2 EN
Figure 150: Simplified logic diagram for the synchronizing function
S
AND
R
AND
50 ms
0
AND
0.05-tClosePulse
AND
0
AND
0-tMaxSynch
1MRK 502 043-UUS B
SYNPROGR
AND
SYNOK
OR
TSTSYNOK
OR
SYNFAIL
0
ANSI08000020-2-en.vsd
Technical Manual