Voltage Selection - ABB REG650 Technical Manual

Section 12
Control
12.1.7.6
12.1.7.7
328

Voltage selection

The voltage selection module including supervision of included voltage transformer
fuses for the different arrangements is a basic part of the SESRSYN (25) function and
determines the parameters fed to the Synchronizing, Synchrocheck and Energizing
check functions. This includes the selection of the appropriate Line and Bus voltages
and fuse supervision.
The voltage selection type to be used is set with the parameter CBConfig.
If No voltage sel. is set the default voltages used will be V-Line1 and V-Bus1. This is
also 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 fuse conditions are connected to
the Synchronizing, Synchronism check 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.
Voltage selection for a single circuit breaker with double busbars
This function uses the binary input from the disconnectors auxiliary contacts BUS1_OP-
BUS1_CL for Bus 1, and BUS2_OP-BUS2_CL 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 VB1OK-VB1FF supervise the fuse for Bus 1 and VB2OK-VB2FF
supervises the fuse for Bus 2. VL1OK and VL1FF supervises the fuse for the Line
voltage transformer. The inputs fail (FF) or healthy (OK) can alternatively be used
dependent on the available signal. If a fuse-failure is detected in the selected voltage
source an output signal VSELFAIL is set. This output signal is true if the selected bus
or line voltages have a fuse failure. This output as well as the function can be blocked
with the input signal BLOCK. The function logic diagram is shown in figure 151.
1MRK 502 043-UUS B
Technical Manual