ABB REL650 Technical Manual page 355

1MRK 506 382-UEN A
Line distance protection REL650 2.2 IEC
Technical manual
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 LN1QOPEN-LN1QCLD, B1QOPEN-B1QCLD, B2QOPEN-B2QCLD,
LN2QOPEN-LN2QCLD are inputs for the position of the Line disconnectors
respectively the Bus and Tie breakers. The outputs LN1SEL, LN2SEL 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 ULN1OK-ULN1FF, ULN2OK-ULN2FF 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.
• The line 1 voltage is selected if the line 1 disconnector is closed.
• The bus 1 voltage is selected if the line 1 disconnector is open and the bus 1
circuit breaker is closed.
• The line 2 voltage is selected if the line 2 disconnector is closed.
• The bus 2 voltage is selected if the line 2 disconnector is open and the bus 2
circuit breaker is closed.
The function also checks the fuse-failure signals for bus 1, bus 2, line 1 and line 2.
If a VT failure is detected in the selected voltage an output signal USELFAIL is
set. This output signal is true if the selected bus or line voltages have a MCB trip.
This output as well as the function can be blocked with the input signal BLOCK.
The function block diagram for the voltage selection of a bus circuit breaker is
shown in figure 173 and for the tie circuit breaker in figure 174.
Section 11
Control
349