ABB REX 521 Technical Reference Manual, Standard Configurations page 139

1MRS 751802-MUM Protection Relay
Technical Reference Manual, Standard Configurations
Instant of fault
Start
Protection
operation
AR1
time
(Trip signal
from protection)
Circuit breaker
Close signal
Discrimination
Time
Alarm
Definite Trip
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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 such 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 0->1
\3I>...3I>>>.
To select the high overcurrent stage (3I>>) in order to initiate the auto-recloser
function, choose 0->1\3I>>. Press [E] push button and scroll the different
initiation signal methods with the [
specific initiation method can be enabled or disabled with the [
buttons. The checksum will be 1 if "3I>> Start AR1" is set and 2 if "3I>> Trip
AR1" is set.
After the initiation method is chosen, the settings for the auto-reclosure function has
to be made. In Main menu\Protection\0->1\General setting\ the
operation is taken in use when the "AR operations" is set to ON and the "Reclaim
time" can be set.
The different shot settings are given in Main menu\Protection\
0->1\Shot1...5 settings. To set the first shot as in the example above with
the initiation from the start,
• go to the Shot 1 setting,
• 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 setting in the same way and with the start delay and dead-
time settings as in the example or as the functionality requires.
To make the initiation by the trip signal,
Shot 2
Shot 1
Dead time
Dead time
→] [←]
and navigation push buttons. The
REX 521
↑] [↓]
and push
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