ZoneSeqCoord
: The
ZONESTEP
input is used when coordination between local auto
reclosers and down stream auto reclosers is needed. When this input is activated the
auto recloser increases its actual shot number by one and enters “reset time” status. If a
start is received during this reclaim time the auto recloser is proceeding as usual but
with the dead time for the increased shot number. Every new increase of the shot
number needs a new activation of the
ZONESTEP
input. The setting
NoOfShots
limits
of course the possibility to increase the shot number. This functionality is controlled by
the setting
ZoneSeqCoord
.
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 the
UNSUCCL
(Reclosing is unsuccessful) signal in
the case the circuit breaker does not respond to the circuit breaker close command, one
can set
UnsucClByCBCheck
= CB Check and set
tUnsucCl
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
BLKOFF
input must be configured to
unblock the function after an unsuccessful auto reclosing attempt. Normal setting is
Disabled
.
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
tPulse
setting. A typical setting may be
tPulse
= 200 ms. A longer
Section 12
1MRK 505 370-UUS A
Control
338
Busbar protection REB670 2.2 ANSI
Application manual
Summary of Contents for RELION REB670
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