Siemens siprotec 7SA6, Manual

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Functions
6-301
7SA6 Manual
C53000-G1176-C156-2
For this purpose, the signal from the circuit-breaker is routed via a correspondingly al-
located output contact of the 7SA6 (output alarm “
CB Alarm Supp
”, FNo
563
). In the
idle state and when the device is turned off, this contact shall be closed. Therefore an
output contact with a normally closed contact (NC contact) has to be allocated. Which
contact is to be allocated is dependent on the device version. Refer to General Dia-
grams in Appendix A, Section A.2.
Prior to the command, with the internal automatic reclosure in the ready state, the con-
tact in open 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 this was taken
into consideration when configuring the protection functions (Section 5.1, address
133
).
Also when closing the breaker via the binary input “
>Manual Close
” (FNo
356
) or
via the integrated automatic reclosure the contact is interrupted so that no breaker
alarm can be sent.
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 6-154 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).
Figure 6-155 shows time diagrams for manual trip and close as well as for protection
tripping with an unsuccessful automatic reclosure.
7SA6
Close
CB
CB Alarm Supp
FNo 563
Trip
L+
(Signalling Circuit
Voltage)
Alarm:
“Breaker tripping”
Operation
Detector