ABB Network Partner AB
Synchronism and energizing
check for single circuit breaker
with voltage selection
Version 1.0-00
1MRK 580 152-XEN
Page 5 - 16
1.3.2 Voltage selection for
a double bus
Select DbleBus on the MMI. Fig. 5 shows the principle for the connection
arrangement. One control terminal unit is used for each bay or it can
alternatively be common for three bays. For the synchronism check
(SYNX) and energizing check function, the voltages on the two busbars
are selected by voltage selection (VOLT.SELX) in the control terminal
unit. The bus voltage from Bus 1 is fed to the U5 analogue single-phase
input, and the bus voltage from Bus 2 is fed to the U4 analogue single-
phase input. The line voltage transformers are connected as a three-phase
voltage UL1, UL2, UL3 (ULx) to the input U-line. For the version
intended for three bays, the line voltages are connected as three, single-
phase inputs, UL1 for Bay1, UL2 for Bay2 and UL3 for Bay3.
The selection of the bus voltage is made by checking the position of the
disconnectors’ auxiliary contacts connected via binary inputs of the voltage
selection logic inputs, SYNX-CB1OPEN (Breaker section X open),
SYNX-CB1CLD (Breaker section 1 closed) and SYNX-CB2OPEN
(Breaker section 2 open), SYNX-CB2CLD (Breaker section 2 closed).
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-UB1(2)OK and SYNX-UB1(2)FF inputs are related to each
busbar voltage. The SYNX-VTSU input is related to each line voltage.
Configure them to the binary inputs that indicate the status of the external
fuse failure of the busbar respectively the line voltage. Only the fuse fail-
ure of a selected voltage causes a blocking of the relevant energizing
check unit.
For the control terminal that is intended for one bay, 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 (SYNX-VTSU). The synchronizing check
is also blocked due to a lack of voltage compared to the set voltage condi-
tions.
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