11.3.6.6
Reclosing checks and the reset timer
When dead time has elapsed during the auto-reclosing procedure certain conditions must
be fulfilled before the CB closing command is issued. To achieve this, signals are
exchanged between program modules to check that these conditions are met. In three-
phase reclosing a synchronizing and/or energizing check can be used. It is possible to use a
synchronism check function in the same physical device or an external one. The release
signal is configured by connecting to the auto-reclosing function input SYNC. If reclosing
without checking is preferred the SYNC input can be set to TRUE (set high). At
confirmation from the synchronism check, or if the reclosing is of single-phase, the signal
passes on.
By choosing
CBReadyType
=
CO
(CB ready for a Close-Open sequence) the readiness of
the circuit breaker is also checked before issuing the CB closing command. If the CB has
a readiness contact of type
CBReadyType
=
OCO
(CB ready for an Open-Close-Open
sequence) this condition may not be complied with after the tripping and at the moment of
reclosure. The Open-Close-Open condition was however checked at the start of the
reclosing cycle and it is then likely that the CB is prepared for a Close-Open sequence.
The synchronism check or energizing check must be fulfilled within a set time interval,
tSync
. If it is not, or if other conditions are not met, the reclosing is interrupted and
blocked.
The reset timer defines a time from the issue of the reclosing command, after which the
reclosing sequence resets. Should a new trip occur during this time, it is treated as a
continuation of the first fault. The reset timer is started when the CB closing command is
given.
A number of outputs for Autoreclosing state control keeps track of the actual state in the
reclosing sequence.
1MRK 506 335-UUS A
Section 11
Control
383
Technical manual
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