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) - Extremely Inverse Time Curve (EI)

350
NVA100X-D - Manual - 02 - 2016
APPENDIX
Residual overcurrent 50N.1/51N.1, 50N.2/51N.2 and 50N(Comp)/51N(Comp) - Extremely inverse time curve (EI)—
F_51N-ANSIEI-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
0.5 s
1 s
0.2 s
0.1 s
0.02 s
t =
t
E1
>
inv
·
[(I
E1
/I
E1
>
inv
)
2
-1]
5.64
+ 0.024
t =
t
E2
>
inv
·
[(I
E2
/I
E2
>
inv
)
2
-1]
5.64
+ 0.024
Note: match of operating and setting time takes place when I
E1
/I
E1
>
inv
, I
E2
/I
E2
>
inv
or I
EC
/I
EC
>
inv
= 2.789
t
E1>inv
t
E2>inv
t
EC>inv
t =
t
EC
>
inv
·
[(I
EC
/I
EC
>
inv
)
2
-1]
5.64
+ 0.024