ABB REX 521 Technical Reference Manual, Standard Configurations page 162

REX 521
162
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 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 0->1
\ 3I>...3I>>>.
To select the high overcurrent stage (3I>>) to initiate the auto-recloser function,
choose the 0->1/3I>>, 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 [
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\0->1\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\0-
>1\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" as the requirements. The Shot 2 and the ongoing shots are made in the same
way.
The open signal from the auto-recloser is connected as the trip directly to the HSPO1
and the close signal is connected to the same output signal as the close signal from
the circuit breaker function. The reclose signal is depended on the interlocking
method chosen for closing of the breaker. If the trip is activated during the close-
Shot 2
Shot 1
Dead time
Dead time
↑] [↓]
and push buttons. The checksum will
1MRS 751802-MUM