Thytronic NG10 - Measures Residual Overcurrent 50 N;51 N - very Inverse Time Curve (IEC 60255-3;BS142 Type B)

APPENDIX
121
NG10 - Manual - 04 - 2022
 Measures residual overcurrent 50N/51N - Very inverse time curve (IEC 60255-3/BS142 type B)
F_51N12-IECB-Char.ai
1.1
21 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]
t
E>inv
= 10 s
t
E>inv
= 60 s
t
E>inv
= 5 s
t
E>inv
= 1 s
t
E>inv
= 0.5 s
t
E>inv
= 0.2 s
t
E(x)>inv
= 0.02 s
t
E(x)
>
inv
= 0.1 s
ote: match of operating and setting time takes occurs when I
E
/I
E
>
inv
= 14.5
t =
t
E
>
inv
·
[(I
E
/I
E
>
inv
)-1]
13.5