Thytronic SME2-IS - First Protection Threshold 50;51 - IEC Inverse Time Curves (Type A, NIT)

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SME2-IS - Manual - 06- 2021
APPENDIX
 First protection threshold 50/51 - IEC inverse time curves (type A, NIT)
F_51-IECA-Char.ai
1.1
2 3 4 5 6 7 8 9 10 20
I /I>inv
0.01
0.1
1
10
100
1000
10000
t [s]
10 s
60 s
t>
inv
5 s
1 s
0.5 s
0.2 s
0.1 s
0.02 s
t =
t>
inv
·
[(I/I>
inv
)
0.02
-1]
0.14
Note: the set actuation time refers to a ratio I/I>
inv
= 700
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