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Functions
2.17 Automatic Reclosure Function (optional)
Notes on the Information Overview
The most important information about automatic reclosure is briefly explained insofar as it was not mentioned
in the following lists or described in detail in the preceding text.
„>BLK 1.AR-cycle" (No. 2742) to „>BLK 4.-n. AR" (No. 2745)
The respective auto-reclose cycle is blocked. If the blocking state already exists when the automatic reclosure
function is initiated, the blocked cycle is not executed and may be skipped (if other cycles are permitted). The
same applies if the automatic reclosure function is started (running), but not internally blocked. If the block
signal of a cycle appears while this cycle is being executed (in progress), the automatic reclosure function is
blocked dynamically; no further automatic reclosures cycles are then executed.
„AR 1.CycZoneRel" (No. 2889) to „AR 4.CycZoneRel" (No. 2892)
The automatic reclosure is ready for the respective reclosure cycle. This information indicates which cycle will
be run next. For example, external protection functions can use this information to release accelerated or over-
reaching trip stages prior to the corresponding reclose cycle.
„AR is blocked" (No. 2783)
The automatic reclosure is blocked (e.g. circuit breaker not ready). This information indicates to the operational
information system that in the event of an upcoming system fault there will be a final trip, i.e. without reclosure.
If the automatic reclosure has been started, this information does not appear.
„AR not ready" (No. 2784)
The automatic reclosure is not ready for reclosure at the moment. In addition to the „AR is blocked" (No.
2783) mentioned above there are also obstructions during the course of the auto-reclosure cycles such as
„action time run out" or „last reclaim time running". This information is particularly helpful during testing because
no protection test cycle with reclosure may be initiated during this state.
„AR in progress" (No. 2801)
This information appears following the start of the automatic reclosure function, i.e. with the first trip command
that can start the automatic reclosure function. If this reclosure was successful (or any in the case of multiple
cycles), the information is reset with the expiry of the last reclaim time. If no reclosure was successful or if re-
closure was blocked, it ends with the last – the final – trip command.
„AR Sync.Request" (No. 2865)
Measuring request to an external synchronism check device. The information appears at the end of a dead time
subsequent to 3-pole tripping if a synchronism request was parameterised for the corresponding cycle. Reclo-
sure only takes place when the synchronism check device has provided the release signal „>Sync.release"
(No. 2731).
„>Sync.release" (No. 2731)
Release of reclosure by an external synchronism check device if this was requested by the output information
„AR Sync.Request" (No. 2865).
342
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
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