[losvsbfp-090712-01.tif, 2, en_US]
Figure 6-248
Function Logic Overview
Function Description
The Circuit-breaker failure protection function is started by device-internal protection functions and/or exter-
nally (via a binary input or an interface, such as GOOSE). Figure 6-249 and Figure 6-250 show the function-
ality.
Internal Start
By default, each device-internal protection stage, that has to control the local circuit breaker, starts the circuit-
breaker failure protection. The function is started by the tripping of the protection stage. In the default setting,
the starting signal Internal start (see Figure 6-249) is held when the pickup signal has a falling edge or
the protection function has tripped. The Circuit-breaker failure protection function can in this case only drop
out if the circuit breaker is detected to be open. This is detected using the current flow or circuit-breaker auxil-
iary contact criterion. If necessary, the Circuit-breaker failure protection function can also drop out when the
pickup signal has a falling edge or the protection function trips (internal starting signal is not held).
Using routing, you can specify whether individual protection stages or protection functions are to be used as
the starting source or whether starting happens only externally.
The internal starting sources are routed in the protection function groups via the Circuit-breaker interaction
entry (for this, see 2.1 Function Embedding in the Device Figure 2-6).
6.41.3
Protection and Automation Functions
6.41 Circuit-Breaker Failure Protection
SIPROTEC 5, Overcurrent Protection, Manual 837
C53000-G5040-C017-8, Edition 07.2017
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