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Section 10
Control
10.1.7.4
170
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=ON
TEST MODE=ON
STARTSYN
BLKSYNCH
OR
Voltage difference between
U-Bus and U-Line < 0.10 p.u
Bus voltage > 80% of
GblBaseSelBus
AND
Line voltage > 80% of
GblBaseSelLine
FreqDiffMax
FreqDiffMin
FreqRateChange
fBus&fLine ± 5 Hz
PhaseDiff < 15 deg
PhaseDiff=closing angle
FreqDiff
Close pulse
in advance
tBreaker
IEC08000020 V5 EN
Figure 71:
Simplified logic diagram for the synchronizing function
Energizing check
Voltage values are measured in the IED and are available for evaluation by the
Energizing check function.
The function measures voltages on the busbar and the line to verify whether they are
live or dead. To be considered live, the value must be above 80% of set UBase selected
S
AND
R
50 ms
t
tClose
Pulse
AND
AND
1MRK 505 288-UEN A
SYNPROGR
AND
AND
OR
AND
TSTSYNOK
OR
tMax
Synch
IEC08000020-5-en.vsd
Technical manual
SYNOK
SYNFAIL
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