ABB Relion 670 Series Applications Manual page 315

1MRK 511 401-UUS F
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
UNSUCCL (Reclosing is unsuccessful) signal in the case the circuit breaker does not respond to
the
the circuit breaker close command, one can set
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
after an unsuccessful auto reclosing attempt. Normal setting is
CutPulse : In circuit breakers without anti-pumping relays, the setting CutPulse = Enabled can be
used to avoid repeated closing operation when reclosing onto a fault. A new start will then cut the
ongoing pulse.
tPulse : The circuit breaker closing command should be long enough to ensure reliable operation of
the circuit breaker. The circuit breaker closing command pulse has a duration set by the
setting. A typical setting may be
indication at testing, for example, in debug mode of the Application Configuration Tool (ACT) in
PCM600. In circuit breakers without anti-pumping relays, the setting
used to avoid repeated closing operations when reclosing onto a fault. A new start will then cut
the ongoing pulse.
tReset : 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 auto reclosing cycle.
One may consider a nominal CB duty cycle of for instance, O – 0.3sec – CO – 3min – 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
or 180 s dependent on the fault level and circuit breaker duty cycle.
tSync : Maximum wait time for fulfilled synchrocheck conditions. The time window should be
coordinated with the operate time and other settings of the synchrocheck function. Attention
should also be paid to the possibility of a power swing when reclosing after a line fault. Too short
a time may prevent a potentially successful auto reclosing.
tCBClosedMin : A typical setting is 5.0 s. If the circuit breaker has not been closed for at least this
minimum time, an auto reclosing start will not be accepted.
tSuccessful : If the circuit breaker closing command is given and the circuit breaker is closed within
the set time interval
tSuccessful .
Bay control REC670
Application manual
BLKOFF input must be configured to unblock the function
tPulse = 200 ms. A longer pulse setting may facilitate dynamic
tUnsucCl , the SUCCL output is activated after the set time interval
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UnsucClByCBCheck = CB Check and set tUnsucCl
Disabled .
CutPulse = Enabled can be
Section 14
Control
tPulse
tReset = 60
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