The voltage selection type to be used is set with the parameter CBConfig.
If No voltage sel. is set the voltages used will be U-Line1 and U-Bus1. This setting is
also used in the case when external voltage selection is provided. Fuse failure
supervision for the used inputs must also be connected.
From the voltage selection part, selected voltages, and functions conditions are
connected to the Synchronizing, Synchrocheck and Energizing check inputs.
For the disconnector positions it is advisable to use (NO) a and (NC) b type contacts
to supply Disconnector Open and Closed positions but, it is also possible to use an
inverter for one of the positions.
10.1.7.7 Voltage selection for a single circuit breaker with double busbars
This function uses the binary input from the disconnectors auxiliary contacts
B1QOPEN-B1QCLD for Bus 1, and B2QOPEN-B2QCLD for Bus 2 to select
between bus 1 and bus 2 voltages. If the disconnector connected to bus 1 is closed and
the disconnector connected to bus 2 is opened the bus 1 voltage is used. All other
combinations use the bus 2 voltage. The outputs B1SEL and B2SEL respectively
indicate the selected Bus voltage.
The function checks the fuse-failure signals for bus 1, bus 2 and line voltage
transformers. Inputs UB1OK-UB1FF supervise the MCB for Bus 1 and UB2OK-
UB2FF supervises the MCB for Bus 2. ULN1OK and ULN1FF supervises the MCB
for the Line voltage transformer. The inputs fail (FF) or healthy (OK) can alternatively
be used dependent on the available signal. If a VT failure is detected in the selected
voltage source an output signal USELFAIL is set. This output signal is true if the
selected bus or line voltages have a VT failure. This output as well as the function can
be blocked with the input signal BLOCK. The function logic diagram is shown in
figure
99.
Section 10 1MRK 511 287-UEN A
Control
220
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