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Figure 2-33
Logic diagram of the intertrip transmission circuit
In order to ensure that the transmission signal reaches all devices in objects with more than two ends, it is also
looped through the protection data interface.
Receiving circuit
On the receiving end the signal can lead to a trip. Alternatively it can also cause an alarm only. In this way it is
possible to determine for each end of the protected object whether the received signal is to trip at this particular
end or not.
Figure 2-34 shows the logic diagram. If the received signal is to cause the trip, it will be forwarded to the tripping
logic. The tripping logic of the device (see also Section 2.25.1) ensures, if necessary, that the conditions for
single-pole tripping are met (e.g. single-pole tripping permissible, auto-reclosure function ready).
Once an error in the protection data interface communication has been detected, the time Td ResetRemote
(address 4512) for resetting the inter trip signals is started. This means that in case of communication is inter-
rupted, a present receive signal maintains its last status for the time Td ResetRemote before it is reset.
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
2.4 Breaker Intertrip and Remote Tripping
Functions
111
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