Lock-Out Initiation - ABB REC670 Applications Manual

1MRK 511 401-UEN A
14.2.2.19
Bay control REC670 2.2 IEC
Application manual
shot can no longer be started. Depending on the set number of auto reclosing shots
further shots may be made or the auto reclosing sequence is ended. After reclaim
timer time-out the auto recloser resets, but the 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.

Lock-out initiation

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 115 and 116
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.
the logic shows how a closing lock-out logic can be
Section 14
Control
M12391-214 v8
311