Where a circuit-breaker does not provide the necessary information (CB open signal), the input
must be permanently set to
off (F or False). Providing the scheme is also not a duplex scheme
(that is, only one CB), the binary input CB2 open must also be permanently set to
on (T or
True).
Accordingly, these are the default settings for
CB open and CB2 open.
The AR function can then operate with a single circuit-breaker without a CB open signal or
superfluous close signal.
De-energized line Dead Line (Dead Line 2) with checking of synchronism
synchroChck (synchroChck2)
Before the
Close CB (or Close CB2) instruction can be issued, either the Dead line or the
synchroChck I/P (or Dead line 2 or synchroChck2 in a duplex scheme) must be at logical 1.
Logic: [(synchroChck AND CO ready) OR Dead Line OR ExtSCBypas]
Logic: [(synchroChck2 AND CO ready 2) OR Dead Line 2 OR ExtSCBypas]
External blocking ExtBlkAR and CondBlkAR'
The reclosure function is always blocked by an active ExtBlkAR input.
An active CondBlkAR input will only block the function, providing a reclosure cycle is not
running (that is, the AR in prog. signal is at logical 0).
The Cond.Blk AR signal is necessary to prevent a reclosure cycle, when reclosure is not
required for the first trip that occurs during
t Oper. This is the case, for example, for trips by
the switch-onto-fault (SOTF) protection or by a directional ground fault protection via PLC.
To prevent the SOFT from initiating autoreclosure, the distance protection SOFT start signal
must be connected to the CondBlkAR input.
Manual close
The reclosure function is immediately blocked (for the blocking time
t AR Block) by a Manual
close signal. This signal is also needed for the overreaching logic to switch the ZExtension
signal to on.
External synchrocheck bypass signal ExtSCBypas
This input provides facility for bypassing the synchroChck and CO Ready (or SynchroChck2
and CO Ready 2 for CB2) enabling inputs.
It is only active for the first fast three-phase or single-phase reclosure attempt.
External extension of the dead time Extend t1
A logical 1 at the Extend t1 input extends the dead times
t Dead1 1P and t Dead1 3P by the
setting
t Dead1 Ext for the first (fast) reclosure attempt. This could be necessary, for example,
in the event of a communication channel failure or in a redundant scheme.
5.8.6.7
Supplementary information for binary outputs
GUID-A2D01995-187A-4A39-B18E-A8F2EBBBE624 v1
The most important autoreclosure output is the Close CB command. This output and 14 other
outputs are provided.
This signal picks up when the closing command is issued and resets at the end of the time
t
Close or earlier if there is a tripping occurs upon reclosing.
1MRK 505 406-UEN B
Section 5
Bay protection functions
Bay protection functions REB500
145
Technical manual
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