Logic of the Function
[lo_7SR5_50BFlogicdiagram, 1, en_US]
Figure 6-1
Logic Diagram: 50BF Circuit-Breaker Failure Protection – 3 Pole
Application and Setting Notes
Parameter:
Setting
•
Default setting: 0.2 x I
n
(0.2 ⋅ I
rated
)
When any phase current is measured above this setting the CB is determined as being in the closed posi-
tion i.e. current is still flowing.
The phase current setting must be set below the minimum phase protection setting current.
Parameter:
Ig Setting
•
Default setting: 0.05 x I
n
(0.05 ⋅ I
rated
)
When earth current is measured above this setting the CB is determined as being in the closed position
i.e. current is still flowing.
The earth fault current setting must be set below the minimum earth fault protection setting current.
Parameter:
Delay 1
•
Default setting:
60 ms
See
.
6.1.3
6.1.4
Supervision Functions
6.1 50BF Circuit-Breaker Failure Protection – 3 Pole
Reyrolle 7SR5, Transformer Protection Device, Device Manual
341
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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