Digital Input To Initiate Auto-Reclosing Function - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
9.4.6.2.
142
Protection Relay
Technical Reference Manual, Standard Configurations
[↓]
push buttons. The checksum for 0->1 Alarm 1 will then be 32. The 0->1 Alarm
1 signal can then be routed to an output contact, in this example SO2, in
Main menu\Configuration\Output Signals\.

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 "0->1 Ext. start" or "0->1 Ext. trip" in
Main menu\Configuration\Input Signals\.
Further in Main menu\Configuration\Input SWGRP\, the external
initiation signal is named as "0->1 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.
External re-closure
initialization signal
Blocking signal from
Residual voltage relay
to Io>
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REX 521
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0
1
Definite Trip Alarm
Circuit breaker failure
protection
Blocking signal to incoming feeder
(START 3I>>)
CLOSE circuit breaker
TRIP circuit breaker