Siemens 7SJ82 Manual page 844

Protection and Automation Functions
6.41 Circuit-Breaker Failure Protection
[loextpol-021112-01.tif, 2, en_US]
Figure 6-256
Routing: Configuration of Internal Starting Sources (Internal Protection Function)
Configuration of the internal starting sources takes place in the protection function groups via the Circuit-
breaker interaction entry (for this, see
By default, the function can be started by any tripping of the internal protection functions that control the
local circuit breaker. Depending on the specific application, it can be necessary to exclude certain device-
internal protection functions from starting the CBFP. For instance, busbar disconnection following a local
circuit-breaker failure can be undesirable in the case of load-shedding applications or ground faults in isolated/
resonant-grounded systems.
Where a start exclusively from external sources is required, all internal protection functions must be routed so
that they are excluded as a starting source.
Parameter: Start via binary input
•
Default setting (_:107) Start via binary input = no
Parameter Value
no
844
Circuit-Breaker Failure Protection with External Start, Tripping Repetition and 3-Pole Tripping
(T2)
2.1 Function Embedding in the
Description
If no external start is intended, the parameter is set to no.
Device, Figure 2-2).
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017