Siemens 6MD85, Manual

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Figure 7-18 Circuit-Breaker Failure Protection with External Pole-Selective Start, Pole-Selective Tripping
Repetition, and 3-Pole Tripping (T2)
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
2.1 Function Embedding in the Device ).
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 starting source.
Parameter: Start via binary input
•
Default setting
(_:107) Start via binary input
=
no
Parameter Value Description
no
If no external start is intended, the parameter is set to
no
.
Protection and Automation Functions
7.1 Circuit-Breaker Failure Protection
530 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017