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
and for the tie circuit breaker in figure
.
Section 14
1MRK502052-UEN B
Control
640
Technical manual
Summary of Contents for Relion REG670
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