ABB RED650 Applications Manual Download

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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

M12391-211 v5

If a new start occurs, and the number of auto reclosing shots is set to 1, and a new

START

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

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)

ABB RED650, Applications Manual

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