ABB REX 521 - Page 193

1MRS751802-MUM
REX 521
193
Protection Relay
Technical Reference Manual, Standard Configurations
Fig. 10.3.3.1.-2 An auto-reclose sequence, when AR is initiated by the trip signal
The reclaim time is always started or restarted at a circuit breaker close operation. A
new initiation signal during the reclaim time will perform the next shot if one has
been selected. When all shots have been executed, the auto-recloser is locked out.
When the reclaim time has elapsed, the lock-out function of the auto-recloser ends,
if lock-out mode for the auto-recloser function has been set to “automatic”.
To be able to initiate the auto-recloser function with the start or trip signal from a
protection function a few settings must be prepared. The initiation signals from the
different protections can be found in Main menu\Configuration\Input
SWGRP\ where for example the overcurrent initiation signals are named as O->I
\3I>…3I>>>.
To select the high overcurrent stage (3I>>) to initiate the auto-recloser function,
choose the O->I/3I>>, press [E], scroll the different initiation signal methods
with the [
→] and [←] navigation push buttons and the specific initiation method
can be enabled or disabled with the [
↑] and [↓] push buttons. The checksum will
be 1 if the 3I>> Start AR1 is set, and 2 if the 3I>> Trip AR1 is set.
After the initiation method is chosen, the settings for the auto-recloser function has
to be done. In Main menu\Protection\O->I\General setting\ the
operation is taken in use with the AR-operation set to ON and the Reclaim
time can be set.
The different shot settings are given in Main menu\Protection\O-
>I\Shot1…5 settings. To set the first shot as earlier in this section with
initiation from the start, go to the Shot 1 settings, select Initiation mode as
“Start”, select AR1 oper. mode as “Init. shot”, set the AR1 start delay to
0.1 s and set the Dead time to 0.3 s. Proceed with the Shot 2 settings in the same
way and with the start-delay and dead-time settings as the example or as the
functionality requires.
To make the initiation by the trip signal, go to the Shot 1 settings, select
Initiation mode as “Trip”, select AR1 oper. mode as “Init. shot” and set
the first Dead time according to the requirements. The Shot 2 and the ongoing
shots are made in the same way.
Start
AR1
(Trip signal
from protection)
Circuit breaker
Discrimination
Time
Close signal
Instant of fault
Protection
operation
time
Shot 1
Dead time
Shot 2
Dead time
Alarm
Definite Trip
AutoreTrip