ABB Relion REC670 Applications Manual page 261

1MRK 511 358-UEN A
At a setting somewhat longer than the auto-reclosing open time, this facility will not influence
the reclosing. A typical setting of
tInhibit , Inhibit resetting delay
A typical setting is
function. Function will be blocked during this time after the
tReclaim , Reclaim time
The Reclaim time sets the time for resetting the function to its original state, after which a line
fault and tripping will be treated as an independent new case with a new reclosing cycle. One
may consider a nominal CB duty cycle of for instance, O-0.3sec CO- 3 min. – CO. However the 3
minute (180 s) recovery time is usually not critical as fault levels are mostly lower than rated
value and the risk of a new fault within a short time is negligible. A typical time may be
tReclaim = 60 or 180 s dependent of the fault level and breaker duty cycle.
StartByCBOpen
The normal setting is
On the start of the autorecloser is controlled by an CB auxiliary contact.
set
FollowCB
The usual setting is
long delay, to cover the case when a CB is being manually closed during the "auto-reclosing
open time" before the auto-reclosing function has issued its CB closing command.
tCBClosedMin
A typical setting is 5.0 s. If the CB has not been closed for at least this minimum time, a
reclosing start will not be accepted.
CBAuxContType , CB auxiliary contact type
It shall be set to correspond to the CB auxiliary contact used. A
recommended in order to generate a positive signal when the CB is in the closed position.
CBReadyType , Type of CB ready signal connected
The selection depends on the type of performance available from the CB operating gear. At
setting
start of the reclosing cycle. The signal will disappear after tripping, but the CB will still be able
to perform the C-O sequence. For the selection
condition is also checked after the set auto-reclosing dead time. This selection has a value first
of all at multi-shot reclosing to ensure that the CB is ready for a C-O sequence at shot 2 and
further shots. During single-shot reclosing, the
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-3minCO).
tPulse , Breaker closing command pulse duration
The pulse should be long enough to ensure reliable operation of the CB. A typical setting may
be tPulse=200 ms . A longer pulse setting may facilitate dynamic indication at testing, for
example, in "Debug" mode of Application Configuration tool (ACT). In CBs without anti-
pumping relays, the setting
when reclosing onto a fault. A new start will then cut the ongoing pulse.
BlockByUnsucCl
Setting of whether an unsuccessful auto-reclose attempt shall set the Auto-Reclose in block. If
used the inputs BLOCKOFF must be configured to unblock the function after an unsuccessful
Reclosing attempt. Normal setting is
Application manual
tInhibit = 5.0 s to ensure reliable interruption and temporary blocking of the
Off . It is used when the function is started by protection trip signals. If
Follow CB = Off . The setting On can be used for delayed reclosing with
OCO (CB ready for an Open – Close – Open cycle), the condition is checked only at the
CutPulse = On can be used to avoid repeated closing operation
tTrip could be close to the auto-reclosing open time.
CO (CB ready for a Close – Open cycle) the
OCO selection can be used. A breaker shall
Off .
tinhibit has been activated.
NormOpen contact is
Section 13
Control
255