1MRS751802-MUM
REX 521
171
Protection Relay
Technical Reference Manual, Standard Configurations
[ā] 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
CBstatusI
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