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2 Functions
CLOSE Command
Transmission
(Remote-CLOSE)
Connecting an
External
Auto-Reclosure
Device
238
With close command transmission via the digital connection paths the dead times are
only set at one line end. The other line end (or line ends in lines with more than two
ends) are set to "Adaptive Dead Time (ADT)". The latter just responds to the received
close commands from the transmitting end.
At the sending line end the transmission of the close command is delayed until it is
sure that the local reclosure was successful. This means that after reclosure still a pos-
sible local pickup is waited for. This delay prevents unnecessary closing at the remote
end on the one hand but also increases the time until reclosure takes place there. This
is not critical for a single-pole interruption or in radial or meshed networks if no stability
problems are expected under these conditions.
Figure 2-102
AR Remote-Close function via protection data interface
The close command can be transmitted by a teleprotection scheme using the protec-
tion interfaces (ordering variant). When the annunciation ´$5 5HPRWH &ORVHµ is
output, this information is transmitted at the same time to the remote end via the pro-
tection data interface. The information is OR-combined with the information of the
binary input ´!$5 5HPRWH&ORVHµ and made available for the automatic reclosure.
(Figure 2-102).
If the 7SA522 has to work with an external reclosure device, the binary inputs and
outputs provided for this purpose must be taken into consideration. The following
inputs and outputs are recommended:
Binary inputs:
383 ´!(QDEOH $5]RQHVµ
With this binary input the external reclosure device
controls the stages of the individual short-circuit pro-
tection functions which are active before reclosure
(e.g. overreaching zone in the distance protection).
This input is not required if no overreaching stage is
used (e.g. differential protection or comparison
scheme with distance protection, see also above
margin heading "Selectivity before Reclosure").
7SA522 Manual
C53000-G1176-C155-3
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