Voltage Selection For A Breaker-And-A-Half Circuit Breaker Arrangement - ABB Relion Technical Manual

1MRK 502 048-UUS A
BUS1_OP
BUS1_CL
BUS2_OP
BUS2_CL
VB1OK
VB1FF
VB2OK
VB2FF
VL1OK
VL1FF
BLOCK
ANSI05000779 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
NOT
AND
bus1Voltage
bus2Voltage
AND
OR
AND
OR
OR

Voltage selection for a breaker-and-a-half circuit breaker arrangement

Note that with breaker-and-a-half schemes three Synchronism check 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 LINE1_OP-LINE1_CL, BUS1_OP-BUS1_CL, BUS2_OP-BUS2_CL,
LINE2_OP-LINE2_CL are inputs for the position of the Line disconnectors respectively
the Bus and Tie breakers. The outputs L1SEL, L2SEL and B2SEL will give indication of
invalidSelection
AND
OR
selectedFuseOK
AND
AND
en05000779_2_ansi.vsd
Section 12
Control
B1SEL
B2SEL
busVoltage
VSELFAIL
357