2.Indication And Control Connections; Implementations; 1.Blocking Signal Received From The Outgoing Feeder And The Bus Sectionalizer - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
11.2.4.2.
11.2.5.
11.2.5.1.
176
Protection Relay
Technical Reference Manual, Standard Configurations
Indication and control connections
The connections for indication and control can be implemented as described in the
first application example (chapter 9.1.), except the signals for the open and close
buttons that in this example are disconnected. Local control can be executed via
HMI according to the instructions in Operator's Manual (1MRS751107-MUM).

Implementations

In the sections below a few implementation examples for the standard configuration
H02 are presented.
Blocking signal received from the outgoing feeder and the bus
sectionalizer
The start signals from the overcurrent protection of the outgoing feeder and bus
sectionalizer can be connected in order to block the overcurrent protection stage 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. See
Fig. 11.2.5.1.-1.
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 8
to the block 3I>>.
1MRS 751802-MUM