Siemens SIPROTEC 7SD80 Manual page 197

Breaker Tripping Alarm Suppression
While every trip command by a protection function is final on a feeder without automatic reclosure, it is desir-
able, when using automatic reclosure, to prevent the operation detector of the circuit breaker (transient contact
on the breaker) from sending an alarm if the trip of the breaker is not final (Figure 2-80).
To accomplish this, the signal from the circuit breaker can be routed via an output contact of the 7SD80 (output
alarm „CB Alarm Supp", no. 563) that is configured accordingly. In the idle state and when the device is
turned off, this contact is closed permanently. This requires an output contact with normally closed contact to
be routed. Which contact has to be routed depends on the device version. See also the general diagrams in
the Appendix.
Prior to the command, with the internal automatic reclosure in the ready state, the contact opens so that no
signal from the circuit breaker is forwarded. This is only the case if the device is equipped with internal auto-
matic reclosure and if the latter was considered when configuring the protection functions (address 133).
Also when closing the breaker via the binary input „>Manual Close" (No 356) or via the integrated automatic
reclosure the contact is interrupted so that the breaker alarm is inhibited.
Further optional closing commands which are not sent via the device cannot be considered. Closing commands
for control can be linked to the alarm suppression via the user-defined logic functions (CFC).
Figure 2-80 Breaker tripping alarm suppression
If the device issues a final trip command, the contact remains closed. This is the case, during the reclaim time
of the automatic reclosure cycle, when the automatic reclosure is blocked or switched off or, due to other
reasons is not ready for automatic reclosure (e.g. tripping only occurred after the action time expired).
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
Functions
2.16 Function Control
197