Implementations; 1.Start Signal From The Second Residual Voltage Stage To Release Blocking; 2.Blocking Signal Received From The Outgoing Feeder; 3.Outgoing Blocking Signal To The Overcurrent Relay On The Hv Side - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
10.2.5.
10.2.5.1.
10.2.5.2.
10.2.5.3.
154
Protection Relay
Technical Reference Manual, Standard Configurations
Main menu\Configuration\Input Signals\
Main menu\Configuration\Input SWGRP\
Main menu\Configuration\Output Signals\
Main menu\Configuration\Output SWGRP\.

Implementations

In the sections below a few implementation examples for the standard configuration
M01 are presented.
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.
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. Please refer to the CD-ROM Technical
Descriptions of Functions (1MRS 750889-MCD) 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>>>.
Outgoing blocking signal to the overcurrent relay on the HV side
The start signals from the overcurrent protection function can be routed to an output
relay to provide a blocking signal. The overcurrent stages 3I>> and 3I>>> have also
a separate BSOUT signal for blocking purpose.
1MRS 751802-MUM