ABB REB670 Applications Manual page 329

1MRK 505 337-UUS -
Application manual
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-0.3sec 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 CutPulse = Enabled can be used to avoid repeated closing
operation when reclosing onto a 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 Disabled.
UnsucClByCBCheck , Unsuccessful closing by CB check
The normal setting is NoCBCheck. The "auto-reclosing unsuccessful" event is then
decided by a new trip within the reset 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, CLOSECMD, one can set UnsucClByCBCheck= 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, e.g. 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 synchronism check at the first CB. Typical
setting is tWaitForMaster=2sec.
AutoCont and tAutoContWait , Automatic continuation to the next shot if the
CB is not closed within the set time
The normal setting is AutoCont = Disabled. The tAutoContWait is the length of time
SMBRREC (79) waits to see if the breaker is closed when AutoCont is set to Enabled.
Normally, the setting can be tAutoContWait = 2 sec.
Section 12
Control
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