Indication And Control Connections; Implementations; Blocking Signal Received From The Outgoing Feeder; Outgoing Blocking Signal To The Overcurrent Relay On The Hv Side - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
9.2.3.4.
9.2.4.
9.2.4.1.
9.2.4.2.
122
Protection Relay
Technical Reference Manual, Standard Configurations
protection function trip signal can be connected or disconnected. When the three-
stage overcurrent (3I> 3I>> and 3I>>>), two-stage earth-fault (Io> and Io>>)
protection is selected the checksum for Trip 1 is 31.

Indication and control connections

All the necessary settings for the indication and control signals of the circuit breaker
and the disconnector for the incoming feeder can be set as described in the first
application example on page 104 onwards for the outgoing feeder (except for the
earth-switch). The settings are made by means of 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\.

Implementations

In the sections below a few implementation examples for the standard configuration
B01 are presented.

Blocking signal received from the outgoing feeder

The start signals from the overcurrent protection of the outgoing feeder can be
connected in order 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.
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 overcurrent stages 3I>, 3I>> and 3I>>>.
The BS1 in this application example 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.
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 the DI9 is selected. The checksum for the
switchgroup in Main menu\Configuration\Input SWGRP
\Blocking 1\ should be 4 to 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.
As mentioned above the start signal from the high-set overcurrent stage 3I>> can be
routed to the high-set stage 3I>> of the HV relay. To use the start signal of a
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
1MRS 751802-MUM