![background image](http://html.mh-extra.com/html/abb/rec650-ansi/rec650-ansi_technical-manual_2772239.webp)
AND
AND
AND
bus1Voltage
OR
OR
OR
VL1FF
VL1OK
VB1FF
VB1OK
VB2FF
VB2OK
BUS2_CL
BUS2_OP
BUS1_CL
BUS1_OP
selectedFuseOK
BLOCK
bus2Voltage
busVoltage
AND
invalidSelection
B2SEL
B1SEL
AND
AND
AND
VSELFAIL
en05000779_2_ansi.vsd
OR
NOT
ANSI05000779 V2 EN
Figure 99:
Logic diagram for the voltage selection function of a single circuit breaker with double busbars
10.1.7.8
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
1MRK 511 287-UUS A
Section 10
Control
233
Technical manual
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