Breaker Failure Protection 50Bf; Description - Siemens SIPROTEC 7SJ61 Manual
Multi-functional protective relay with bay controller
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2.12
Breaker Failure Protection 50BF
The breaker failure protection function monitors proper switchoff of the relevant circuit breaker.
2.12.1
Description
General
If after a programmable time delay, the circuit breaker has not opened, breaker failure protection issues a trip
signal via a superordinate circuit breaker (see example in the figure below).
Figure 2-62
Initiation
The breaker failure protection function can be initiated by two different sources:
• Trip signals of internal protective functions of the 7SJ61,
• external trip signals via binary inputs („>50BF ext SRC").
For each of the two sources, a unique pickup message is generated, a unique time delay is initiated, and a
unique trip signal is generated. The setting values of current threshold and delay time apply to both sources.
Criteria
There are two criteria for breaker failure detection:
• Check whether the current flow has effectively disappeared after a tripping command was issued,
• Evaluate the circuit breaker's auxiliary contacts.
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
Function principle of the breaker failure protection
Functions
2.12 Breaker Failure Protection 50BF
185
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