Siemens SIPROTEC 7SD610 Manual page 79

Receiving circuit
On the receiving end the signal can lead to a trip. Alternatively it can also cause an alarm only.
Figure 2-24 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 entire device (see also Section 2.16.1) ensures, if necessary, that the conditions
for single-pole tripping are fulfilled (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
at address 4512 is started for resetting the transfer trip signals. This means that in case of communication in-
terruption, a present receive signal maintains its last status for the time Td ResetRemote before it is reset.
Figure 2-24 Logic diagram of the intertrip — receiving circuit
Ancillary Functions
Since the signals for remote tripping can be set to cause only an alarm, any other desired signals can be trans-
mitted in this way as well. After the binary input(s) have been activated, the signals which are set to cause an
alarm at the receiving end are transmitted. These alarms can in turn execute any desired actions at the receiv-
ing end.
It should be noted that for the transmission of remote alarms and remote commands a further 24 transmission
channels and, in addition, 4 fast transmission channels are optionally available (see also Section 2.7).
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
2.4 Breaker Intertrip and Remote Tripping
Functions
79