ABB REQ650 - Page 233

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 NormOpen contact is
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 CO (CB
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 reclosing to
ensure that the CB is ready for a C-O sequence at shot 2 and further shots. During
single-shot 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-0.3 secCO-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 PCM600 Application
Configuration Tool (ACT).
BlockByUnsucCl
Setting of whether an Unsuccessful Auto-Reclose attempt shall set the Auto- Reclose
in Block. If used the inputs BLKOFF must be configured to unblock the function after
an unsuccessful Reclosing attempt. Normal setting is Off.
UnsucClByCBChk , Unsuccessful closing by CB check
The normal setting is NoCBCheck. The “auto-reclosing unsuccessful” event is then
decided by a new trip within the reclaim reclaim time after the last reclosing shot. If
one wants to get the UNSUCCL (Unsuccessful closing) signal in the case the CB does
not respond to the closing command, CLOSECB, one can set UnsucClByCBChk = CB
check and set tUnsucCl for instance to 1.0 s.
Priority and time tWaitForMaster
In single CB applications, one sets Priority = None. At sequential reclosing the
function of the first CB, for example near the busbar, is set Priority = High and for the
second CB Priority = Low. The maximum waiting time, tWaitForMaster of the
second CB is set longer than the “auto-reclosing open time” and a margin for
synchrocheck at the first CB. Typical setting is tWaitForMaster =2s.
1MRK 505 291-UEN A Section 10
Control
227
Application manual