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

1MRK 580 167-XEN
Page 5 - 36

2 Theory of operation

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

2.1 Synchro check

Synchronism and energizing
check for double circuit breakers
and voltage selection
SYNX
SYNX-BLOCK
SYNX-VTSU
SYN1-UBIFF
SYN1-UBIOK
FreqDiff
PhaseDiff
UDiff
UHigh
ULow
Fig. 5 Input and output signals
Description of input and output signals for the synchro check function.
Input signals
SYNX-BLOCK
SYNX-VTSU
SYNX-UB1FF
SYNX-UB1OK
ABB Network Partner AB
X=1,2,3 or 4
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.
External fuse failure input from busbar voltage
Bus 1 (U5). This signal can come from a tripped
fuse switch (MCB) on the secondary side of the
voltage transformer. In case of a fuse failure the
energizing check is blocked.
No external voltage fuse failure (U5). Inverted
signal.
Version 1.0-00
Connectable
outputs
(X80167-5)