Theory Of Operation; Synchro Check - ABB REC 561 User Manual

ABB Network Partner AB
Version 1.0-00

2 Theory of operation

Connectable
inputs
General Block
From fuse failure
detection, lineside
(external or internal)

2.1 Synchro check

Synchronism and energizing
check for single circuit breaker
with voltage selection
SYNX
SYNX-BLOCK
SYNX-VTSU
FreqDiff
PhaseDiff
UDiff
UHigh
ULow
Fig. 6 Input and output signals
Description of input and output signals for the synchro check function.
Input signals
SYNX-BLOCK
SYNX-VTSU
Output signals
SYNX-AUTOOK
SYNX-MANOK
X=1,2 or 3
50-300 mHz
<
5-75 deg
<
5-50 %
<
70-100 %
>
10-80 %
<
SYNX-AUTO
SYNX-MANOK
Description
General block input from any external condi
tion, that should block the synchro-check.
The SYNC function cooperates with the FUSE-
VTSU connected signal, which is the built-in
optional fuse failure detection. It can also be
connected to external condition for fuse failure.
This is a blocking condition for the energizing
function.
Description
Synchro-check/energizing OK. The output sig-
nal is high when the synchro-check conditions
set on the MMI are fulfilled. It can also include
the energizing condition, if selected. The signal
can be used to release the auto-recloser before
closing attempt of the circuit breaker. It can also
be used as a free signal.
Same as above but with alternative settings of
the direction for energizing to be used during
manual closing of the circuit breaker.
1MRK 580 152-XEN
Page 5 - 17
Connectable
outputs
(X80152-6)