Chapter 6. Description of Operation of Protection Subsystem
6-21
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
6.7
Logic
The Logic settings include the following functions:
Trip Seal-In
,
Breaker Open
and
Close
Failure
Time
and
Closing through the Recloser (7IRD-A/J
Models).
6.7.1
Trip Seal-In
The Trip Output Seal-In function is enabled by setting the Seal-In
Enable
to
YES
. Once a
protective trip and subsequent breaker operation command have been generated, the
command is maintained until the breaker has opened as indicated by the 52b auxiliary contact
which monitors breaker position.
If the Seal-In
Enable
is set to
NO
, the trip command resets when the protection trip elements
reset. If the breaker fails to open, and the fault has been cleared by an upstream breaker, the
Trip Output contact will be destroyed attempting to interrupt the breaker trip coil current.
6.7.2
Breaker Open and Breaker Close Failure Time
For manual operations as for those generated by the protection or Reclose units, the non
reception of the breaker change of status, after the operation order has been emitted, within the
time of Operation Failure (adjustable independently for the opening and the closure), induces
the activation of the
Opening Order Failure
or
Closing Order Failure
signals. If the
Closing
Order Failure
signal is generated before breaker closure during a reclose cycle, it will cause
the Recloser to block.
The equipment will maintain the closing or opening order for the time indicated in this setting if
the operation is not executed before that time has elapsed.
6.7.3
Manual Closing through Recloser (7IRD-A/J Models)
As it has already been mentioned in paragraph 6.6.3 about the Recloser, there is a possibility to
close the breaker through the Recloser
Logic
, so that it is this logic that decides the closure.
For this to occur, it is necessary to set the
Closure
setting through the Recloser on
YES
(box
ticked).
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Страница 175: ...D List of Illustrations and Tables...