1MRS751802-MUM
REX 521
171
Protection Relay
Technical Reference Manual, Standard Configurations
[↓]
push buttons. The checksum for O->I Alarm 1 will then be 32. The O->I Alarm
1 signal can then be routed to an output contact, in this example SO2, in
Main menu\Configuration\Output Signals\
.
9.4.6.2.
Digital input to initiate auto-reclosing function
If an external start or trip signal is available for initializing the auto-recloser, the
signal can be connected to a digital input of the relay. Set the digital input, in this
example DI7, to the
O->I Ext. start
or
O->I Ext. trip
in
Main menu\Configuration\Input Signals\
.
Further in
Main menu\Configuration\Input SWGRP\
, the external
initiation signal is named as
O->I External
. The initiation method is chosen and
in this example Trip AR1 or Start AR1 can be used depending on the signal available
and the methods parametrized within the auto-recloser function.
The rest of the settings are made in the settings for the auto-recloser in the same way
as mentioned above.
Fig. 9.4.6.2.-1 Connection diagram for the standard configuration B02 with the
breaker status indication, control and alarm signals.
CB
REX 521
Blocking signal from
Residual voltage relay
to Io>
Circuit breaker failure
protection
Blocking signal to incoming feeder
(START 3I>>)
TRIP circuit breaker
CLOSE circuit breaker
DC
ES
0
1
External re-closure
initialization signal
Definite Trip Alarm
CB
st
at
u
s
I
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