Voltage Selection - ABB Relion Technical Manual

Section 12
Control
12.1.7.6
12.1.7.7
356

Voltage selection

The voltage selection module including supervision of included voltage transformers for
the different arrangements is a basic part of the SESRSYN (25) function and determines
the voltages fed to the Synchronizing, Synchrocheck and Energizing check functions.
This includes the selection of the appropriate Line and Bus voltages and MCB
supervision.
The voltage selection type to be used is set with the parameter CBConfig.
If No voltage sel. is set the voltages used will be V-Line1 and V-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, 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 MCB for Bus 1 and VB2OK-VB2FF supervises the
MCB for Bus 2. VL1OK and VL1FF 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 VSELFAIL 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 166.
1MRK 502 048-UUS A
Technical manual