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NVA100X-D - Manual - 02 - 2016
APPENDIX
Phase overcurrent 50/51 side H and side L - Very inverse time curve (IEC 60255-3/BS142 type B)
—
F_51-IECB-Char.ai
1.1
2
3
4
5
6
7
8 9 10
20
I
/
I
(H)
>inv
I
/
I
(L)
>inv
0.01
0.1
1
10
100
1000
10000
t
[s]
10 s
60 s
5 s
1 s
0.5 s
0.2 s
0.02 s
0.1 s
Nota: il tempo d’intervento impostato è riferito ad un valore di corrente pari a I/I
(H)
>
inv
o I/I
(L)
>
inv
= 14.5
t
=
t
(H)
>
inv
t
(H)
>
inv
·
[(
I
/
I
(H)
>
inv
) -1]
13.5
t
=
t
(L)
>
inv
t
(L)
>
inv
·
[(
I
/
I
(L)
>
inv
) -1]
13.5