ABB Relion 670 Series Applications Manual page 294

Section 13
Control
tReset , Reset time
The Reset 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
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
with 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
OCO (CB ready for an Open – Close – Open cycle), the condition is checked only at the 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
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
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
CutPulse = Enabled can be used to avoid repeated closing operation when reclosing onto a
setting
fault. A new initiation 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
288
Disabled . It is used when the function is started by protection trip signals. If
Follow CB = Disabled . The setting Enabled can be used for delayed reclosing
CO (CB ready for a Close – Open cycle) the condition is also
OCO selection can be used. A breaker shall according to its duty cycle
Disabled .
1MRK 511 358-UUS A
tReset = 60 or 180 s
NormOpen contact is
Application manual