ABB REC670 Applications Manual page 330

Section 14
Control
324
this facility will not influence the auto reclosing. A typical setting of tLongStartInh
could be close to the auto reclosing dead time.
tInhibit: To ensure reliable interruption and temporary blocking of the auto recloser
a resetting time delay tInhibit is used. The auto recloser will be blocked this time
after the deactivation of the INHIBIT input. A typical resetting delay is 5.0 s.
ZoneSeqCoord: The ZONESTEP input is used when coordination between local
auto reclosers and down stream auto reclosers is needed. When this input is
activated the auto recloser increases its actual shot number by one and enters
"reclaim time" status. If a start is received during this reclaim time the auto
recloser is proceeding as usual but with the dead time for the increased shot
number. Every new increase of the shot number needs a new activation of the
ZONESTEP input. The setting NoOfShots limits of course the possibility to
increase the shot number. This functionality is controlled by the setting
ZoneSeqCoord.
CircuitBreaker settings
CBReadyType: The selection depends on the type of performance available from
the circuit breaker operating gear. At setting OCO (circuit breaker ready for an
Open – Close – Open cycle), the condition is checked only at the start of the auto
reclosing cycle. The signal will disappear after tripping, but the circuit breaker will
still be able to perform the C-O sequence. For the selection CO (circuit breaker
ready for a Close – Open cycle) the condition is also checked after the set auto
reclosing dead time. This selection has a value first of all at multi-shot auto
reclosing to ensure that the circuit breaker is ready for a C-O sequence at shot two
and further shots. During single-shot auto reclosing, the OCO selection can be
used. A breaker shall according to its duty cycle always have storing energy for a
CO operation after the first trip. (IEC 56 duty cycle is O – 0.3sec – CO – 3min –
CO).
FollowCB: The usual setting is Follow CB = Off. The setting On can be used for
delayed auto reclosing with long delay, to cover the case when a circuit breaker is
being manually closed during the auto reclosing dead time before the auto recloser
has issued its breaker close command.
UnsucClByCBChk: The normal setting is NoCBCheck and the auto reclosing
unsuccessful event is then decided by a new trip within the reclaim time after the
last reclosing shot. If one wants to get the UNSUCCL (Reclosing is unsuccessful)
signal in the case the circuit breaker does not respond to the circuit breaker close
command, one can set UnsucClByCBCheck = CB Check and set tUnsucCl for
instance to 1.0 s.
BlockByUnsucCl: Setting of whether an unsuccessful auto reclosing attempt shall
set the auto recloser in blocked status. If used the BLKOFF input must be
configured to unblock the function after an unsuccessful auto reclosing attempt.
Normal setting is Off.
1MRK 511 401-UEN A
Bay control REC670 2.2 IEC
Application manual