Thytronic Pro-N NVA100X-D

APPENDIX
331
NVA100X-D - Manual - 02 - 2016
Residual overcurrent 50N.1/51N.1, 50N.2/51N.2 and 50N(Comp)/51N(Comp) - Standard inverse time curve
(IEC 60255-3/BS142 type A)
—
F_51N-IECA-Char.ai
1.1
2 3 4 5 6 7 8 9 10 20
I
E1
/I
E1
>inv
I
E2
/I
E2
>inv
I
EC
/I
EC
>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
0.1 s
0.02 s
t =
t
E1
>
inv
·
[(I
E1
/I
E1
>
inv
)
0.02
-1]
0.14
t =
t
E2
>
inv
·
[(I
E2
/I
E2
>
inv
)
0.02
-1]
0.14
Note: match of operating and setting time takes place when I
E1
/I
E1
>
inv
, I
E2
/I
E2
>
inv
o I
EC
/I
EC
>
inv
= 700
t =
t
EC
>
inv
·
[(I
EC
/I
EC
>
inv
)
0.02
-1]
0.14
t
E1>inv
t
E1>inv
t
EC>inv