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[losvsbfp-090712-01.tif, 2, en_US]
Figure 6-248
Function Description
6.41.3
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).
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
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
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Function Logic Overview
2.1 Function Embedding in the Device Figure
Figure 6-249
Figure
6-249) is held when the pickup signal has a falling edge or
2-6).
Protection and Automation Functions
6.41 Circuit-Breaker Failure Protection
and
Figure 6-250
show the function-
837
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