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-US
Figure 404: Logic diagram for the voltage selection function of a single circuit breaker with double busbars
Voltage selection for a breaker-and-a-half circuit breaker arrangement
M14839-3 v8
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.
With the setting parameter
CBConfig
the selection of actual CB location in the 1 1/2 circuit breaker
switchgear is done. The settings are:
1 1/2 Bus CB
,
1 1/2 alt. Bus CB
or
Tie CB
.
This voltage selection function uses the binary inputs from the disconnectors and circuit breakers
auxiliary contacts to select the right voltage for the SESRSYN 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 the selected Line voltage as a reference to the fixed
Bus 1 voltage, which indicates B1SEL.
The fuse supervision is connected to VL1OK-VL1FF, VL2OK-VL2FF and with alternative Healthy or
Failing fuse signals depending on what is available from each fuse (MCB).
The tie circuit breaker is connected either to bus 1 or line 1 voltage on one side and the other side
is connected either to bus 2 or line 2 voltage. Four different output combinations are possible, bus
to bus, bus to line, line to bus and line to line.
1MRK 502 066-UUS B Section 14
Control
761
Technical manual
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