ABB REB670 Applications Manual page 331

1MRK 505 370-UUS A
Busbar protection REB670 2.2 ANSI
Application manual
different alternatives regarding what shall generate lock-out. Examples of questions
are:
• shall back-up time delayed trip give lock-out (normally yes)
• shall lock-out be generated when closing onto a fault (mostly)
• shall lock-out be generated when the auto recloser is Off at the fault or for
example, in single-phase auto recloser mode and the fault was multi-phase
(normally not as no closing attempt has been given)
• shall lock-out be generated if the circuit breaker did not have sufficient operating
power for an auto reclosing sequence (normally not as no auto closing attempt has
been given)
In Figures 126 and 127 the logic shows how a closing lock-out logic can be designed
with the lock-out relay as an external relay alternatively with the lock-out created
internally with the manual closing going through the synchrocheck function. An
example of lock-out logic.
SMBRREC (79)
BJ-TRIP
OR
INHIBIT
ZCVPSOF-TRIP
CCRBRF (50BF)
TRBU
ANSI05000315 V2 EN-US
Figure 126: Lock-out arranged with an external lock-out relay
UNSUCCL
OR
Section 12
SMBO
ELECTRICAL RESET
RELAY
Lock-out
RXMD1
11
SET
21
12
RESET
CLOSE COMMAND
MAIN ZAK CLOSE
ANSI05000315_2_en.vsd
Control
325