ABB Relion 670 Series Applications Manual page 294

Section 12
Control
There is a counter for each type of auto reclosing command and one for the total number of auto
reclosing commands.
12.2.2.17 Transient fault
After the breaker closing command the reclaim timer keeps running for the set tReclaim time. If no start
(trip) occurs within this time, the auto recloser will reset. The circuit breaker remains closed and the
operating gear recharges. The CBCLOSED and CBREADY input signals will be set.
12.2.2.18 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 START or 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 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
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
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.
288
134 and 135 the logic shows how a closing lock-out logic can be designed with the lock-out
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Busbar protection REB670
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