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tion detector of the circuit breaker (transient contact on the breaker) from sending an
alarm if the trip of the breaker is not final (Figure 2-102).
For this purpose, the signal from the circuit breaker is routed via a correspondingly al-
located output contact of the 7SD610 (output indication „CB Alarm Supp", no. 563).
In the idle state and when the device is turned off, this contact is closed. Therefore an
output contact with a normally closed contact (NC contact) has to be allocated. Which
contact is to be allocated depends on the device version. Refer to the general views
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 automatic reclosure and if the latter was
taken into consideration when configuring the protective 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 taken
into consideration. Closing commands for control can be linked to the alarm suppres-
sion via the user-defined logic functions (CFC).
Figure 2-102
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).
Figure 2-103 shows time diagrams for manual trip and close as well as for short-circuit
tripping with a single, failed automatic reclosure cycle.
7SD610 Manual
C53000-G1176-C145-4
2.16 Function Control and Circuit Breaker Test
Breaker tripping alarm suppression
233
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