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4.11. Function 50BF. Breaker Failure monitoring
This protection function is only available depending on model and the settings are as follows:
Group
Description
Minimum
Maximum
Step
Unit
Default
50BF (*)
Breaker Failure monitoring
Function Enable
-
-
Yes/No
-
No
Time Delay
0.02
1.00
0.01
s
0.2
(*) Optional depending on model
The following automaton describes the open fault function:
The start of 50BF function is associated to the general trip. Once the trip happens, the time is counted.
If, following the adjusted open fault time, the switch is not detected to have open, the function indicates
an alarm. The function is reset when the circuit breaker is detected open.
To monitor the circuit breaker opening the current measurement via the three phases is used. When the
current via the three phases is less than 60mA, the circuit breaker is considered to be open.
The start of 50BF function is associated to the general trip.
Содержание SIA-B Series
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