ABB Relion 670 Series Applications Manual page 341

1MRK 511 401-UEN Rev. K
pulse length is always 50ms. At the issue of the breaker closing command, the appropriate
auto recloser operation counter is incremented. There is a counter for each type of auto
reclosing command and one for the total number of auto reclosing commands.
15.2.2.17 Transient fault
After the breaker closing command the reclaim timer keeps running for the set
If no start (trip) occurs within this time, the auto recloser will reset. The circuit breaker remains
closed and the operating gear recharges. The
set.
15.2.2.18 Permanent fault and reclosing unsuccessful signal
If a new start occurs, and the number of auto reclosing shots is set to 1, and a new
TRSOTF input signal appears, after the circuit breaker closing command, the UNSUCCL output
(unsuccessful reclosing) is set high. The timer for the first 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
input is missing. Thus, the auto recloser is not ready for a new auto reclosing cycle. Normally,
UNSUCCL output appears when a new start is received after the last auto reclosing shot
the
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.
UnsucClByCBChk setting should then be set to CBCheck , and the tUnsucCl timer should be
The
set too. If the circuit breaker does not respond to the breaker closing command and does not
close, but remains open, 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.
15.2.2.19 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
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.
Bay control REC670
Application manual
UNSUCCL output is set high after the set tUnsucCl time. The
149 and 150 the logic shows how a closing lock-out logic can be designed with the
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CBCLOSED and CBREADY input signals will be
Section 15
Control
M12391-208 v4
tReclaim time.
M12391-211 v5
START or
CBCLOSED
M12391-214 v8
335