1MRS751802-MUM
REX 521
185
Protection Relay
Technical Reference Manual, Standard Configurations
10.2.4.2.
Indication and control connections
The connections for the indication and the control signals of the circuit breaker and
the disconnector for the incoming feeder can be set as described in the first
application example on Section 9.2. Incoming feeder, Basic B01 onwards. Settings
are made via the Relay Setting Tool or the local HMI. The settings can be found in:
Main menu\Configuration\Input Signals\
Main menu\Configuration\Input SWGRP\
Main menu\Configuration\Output Signals\
Main menu\Configuration\Output SWGRP\
.
10.2.5.
Implementations
In the sections below a few implementation examples for the standard configuration
M01 are presented.
10.2.5.1.
Start signal from the second residual voltage stage to release
blocking
The start signal from the residual voltage high stage can be routed to an output relay
to release the blocking signal for the non-directional earth fault stages on the
outgoing feeders of the network. To use the start signal from the residual protection
function, the signal has to be routed via
Main menu\Configuration\Output SWGRP\Start 1
or
\Start 2
.
When the start signal has been routed, the output relay has to be selected in
Main menu\Configuration\Output Signals
.
In this example, the directional earth fault stage Io>>-> is configured as a Uo>>
protection and the start signal is routed via Start 1 and then connected to the signal
output 2, SO2. The checksum in this application example for Start 1 is 16.
10.2.5.2.
Blocking signal received from the outgoing feeder
The start signals from the overcurrent protection of the outgoing feeder can be
connected to block the overcurrent protection stages on the incoming feeder. There
are two input blocking signals, Blocking 1 and Blocking 2, which can have different
functions depending on the different protections.
On the overcurrent stages 3I>, 3I>> and 3I>>>, the Blocking 1 input signal is
connected to the BS1 input and the Blocking 2 input signal is connected to the BS2
input of the function. In this application example, the BS1 will stop the DT or IDTM
timer and the BS2 will block the trip signal. Refer to the CD-ROM
Technical
Descriptions of Function
s (see Section 1.5. Related documents) for more
information about the different protection function blocks.
In this application example the digital input DI9 is connected to the input signal
Blocking 1 and then routed to the BS1 input of the overcurrent stage 3I>>>. The
Blocking 1 signal can be found in
Main menu\Configuration\Input
Signals\Blocking 1\
where DI9 is selected. The checksum for the
switchgroup in
Main menu\Configuration\Input
SWGRP\Blocking 1\
should be 4 to the block 3I>>>.
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