Synchronism and energizing
check for double circuit breakers
and voltage selection
ABB Network Partner AB
1MRK 580 167-XEN
Page 5 - 35
Version 1.0-00
For the synchro check and energizing check, the voltage from Bus 1
(SYN1(3)-U-bus) is connected to the single-phase analouge input (U5) on
the control terminal and the voltage from Bus 2 (SYN2(4)-U-bus) is con-
nected to the single-phase analouge input (U4).
For the control terminal intended for one bay the line voltage transformers
are connected as a three-phase voltage to the analouge inputs UL1, UL2,
UL3 (ULX) (SYN1(2)-U-Line) voltage. For the version intended for two
bays the line voltages are connected as two single phase inputs, UL1 for
Bay 1 and UL2 for Bay 2
The synchronism condition is set on the MMI of the control terminal
unint, and the voltage is taken from Bus 1 and the Line or from Bus 2 and
the Line (U-line). This means that the two synchro-check units are operat-
ing without any special voltage selection, but with the same line (U-line)
voltage.
The configuration of internal signals, inputs, and outputs may be different
for different busbar systems, and the actual configuration for the substa-
tion must be done during engineering of the control terminal.
1.4 Fuse failure and
Voltage OK signals
The external fuse-failure signals or signals from a tripped fuse switch/
MCB are connected to binary inputs configured to inputs of the synchro-
check functions in the control terminal. There are two alternative connec-
tion possibilities. Inputs named OK must be supplied if the voltage circuit
is healthy. Inputs named FF must be supplied if the voltage circuit is
faulty.
The SYNX-UB1OK and SYNX-UB1FF inputs are related to the busbar
voltage. Configure them to the binary inputs that indicate the status of the
external fuse failure of the busbar voltage. The SYNX-VTSU input is
related to the line voltage from each line.
You can use the FUSE-VTSU signal from the built-in optional selectable
fuse-failure function as an alternative to the external fuse-failure signals.
In case of a fuse failure (FUSE-VTSU), the energizing check (dead line-
check) is blocked via the input (SYN1-VTSU). The synchronizing check
is also blocked due to a lack of voltage compared to the set voltage condi-
tions.
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