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NVA100X-D - Manual - 02 - 2016
APPENDIX
Residual overcurrent 50N.1/51N.1, 50N.2/51N.2 and 50N(Comp)/51N(Comp) - Electromechanical inverse curves (EM)
—
F_51N-EM-Char.ai
1.1
2
3
4
5
6
7
8 9 10
20
I
E
/
I
E
>inv
0.01
0.1
1
10
100
1000
10000
t
[s]
60 s
10 s
5 s
1 s
0.5 s
0.2 s
0.1 s
0.02 s
Note: match of operating and setting time takes place when I
E
/I
E
>
inv
or I
EC
/I
EC
>
inv
= 4
t
=
t
E
>
inv
·
[-0.236
·
(
I
E
/
I
E
>
inv
)
-1
+ 0.339]
0.28
I
EC
/
I
EC
>inv
t
E>inv
t
EC>inv
t
=
t
EC
>
inv
·
[-0.236
·
(
I
EC
/
I
EC
>
inv
)
-1
+ 0.339]
0.28