Voltage Selection For A 1 1/2 Circuit Breaker Arrangement - ABB REG650 Technical Manual

1MRK 502 048-UEN A
B1QOPEN
B1QCLD
B2QOPEN
B2QCLD
UB1OK
UB1FF
UB2OK
UB2FF
ULN1OK
ULN1FF
BLOCK
IEC05000779 V2 EN
Figure 166: Logic diagram for the voltage selection function of a single circuit breaker with double busbars
12.1.7.8
Technical manual
AND
AND
bus1Voltage
bus2Voltage
OR
OR
OR

Voltage selection for a 1 1/2 circuit breaker arrangement

Note that with 1½ breaker schemes three Synchrocheck functions must be used for the
complete diameter. Below, the scheme for one Bus breaker and the Tie breaker is
described.
This voltage selection function uses the binary inputs from the disconnectors and
circuit breakers auxiliary contacts to select the right voltage for the SESRSYN
(Synchronism, Synchronizing and Energizing check) function. For the bus circuit
breaker one side of the circuit breaker is connected to the busbar and the other side is
connected either to line 1, line 2 or the other busbar depending on the best selection of
voltage circuit.
Inputs LN1QOPEN-LN1QCLD, B1QOPEN-B1QCLD, B2QOPEN-B2QCLD,
LN2QOPEN-LN2QCLD are inputs for the position of the Line disconnectors
respectively the Bus and Tie breakers. The outputs LN1SEL, LN2SEL and B2SEL
will give indication of the selected Line voltage as a reference to the fixed Bus 1
voltage, which indicates B1SEL.
1
AND
OR
AND
Section 12
Control
B1SEL
B2SEL
invalidSelection
AND
busVoltage
selectedFuseOK
AND
USELFAIL
AND
en05000779-2.vsd
333