Thytronic Pro-N NVA100X-D - Residual overcurrent 50 N.1;51 N.1, 50 N.2;51 N.2 and 50 N(Comp);51 N(Comp) - Very inverse time curve (IEC 60255-3;BS142 type B)

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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) -Very inverse time curve
(IEC 60255-3/BS142 type B)
—
F_51N-IECB-Char.ai
1.1
2 3 4 5 6 7 8 9 10 20
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
t =
t
E1
>
inv
·
[(I
E1
/I
E1
>
inv
) -1]
13.5
t =
t
E2
>
inv
·
[(I
E2
/I
E2
>
inv
) -1]
13.5
Note: match of operating and setting time takes place when II
E1
/I
E1
>
inv
, I
E2
/I
E2
>
inv
o I
EC
/I
EC
>
inv
= 14.5
13.5
t =
t
EC
>
inv
·
[(I
EC
/I
EC
>
inv
) -1]
t
E1>inv
t
E2>inv
t
EC>inv
I
E1
/I
E1
>inv
I
E2
/I
E2
>inv
I
EC
/I
EC
>inv