ABB REB670 Series, Applications Manual

Page: 278 / 476

circuit breaker remains open. The circuit breaker closed information through the
CBCLOSED
input is missing. Thus, the auto recloser is not ready for a new auto reclosing cycle. Normally,
the
UNSUCCL output appears when a new start is received after the last auto reclosing shot
has been made and the auto recloser is inhibited. The output signal resets after reclaim time.
The “unsuccessful” signal can also be made to depend on the circuit breaker position input.
The UnsucClByCBChk setting should then be set to CBCheck, and the tUnsucCl timer should be
set too. If the circuit breaker does not respond to the breaker closing command and does not
close, but remains open, the
UNSUCCL output is set high after the set tUnsucCl time. The
UNSUCCL output can for example, be used in multi-breaker arrangement to cancel the auto
reclosing for the second circuit breaker, if the first circuit breaker closed onto a persistent
fault. It can also be used to generate a lock-out of manual circuit breaker closing until the
operator has reset the lock-out, see separate section.
12.2.2.19 Lock-out initiation
M12391-214 v8
In many cases there is a requirement that a lock-out is generated when the auto reclosing
attempt fails. This is done with logic connected to the in- and outputs of the auto recloser and
connected to binary I/O as required. Many alternative ways of performing the logic exist
depending on whether manual circuit breaker closing is interlocked in the IED, whether an
external physical lock-out relay exists and whether the reset is hardwired, or carried out by
means of communication. There are also 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 132 and 133 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.
Lock-out
RXMD1
11
12
21
MAIN ZAK CLOSE CLOSE COMMAND
SMBO
OR
SMBRREC
OR
CCRBRF
BU-TRIP
ZCVPSOF-TRIP
INHIBIT
UNSUCCL
TRBU
IEC05000315-4-en.vsd
IEC05000315-WMF V4 EN-US
Figure 132: Lock-out arranged with an external lock-out relay
Section 12 1MRK 505 370-UEN D
Control
272 Busbar protection REB670
Application manual