Thytronic NA011 - Residual Overcurrent 50 N;51 N - Extremely Inverse Time Curve (ANSI;IEEE Type EI)

APPENDIX
84
NA011 - Manual - 05 - 2022
 Residual overcurrent 50N/51N - Extremely inverse time curve (ANSI/IEEE type EI)
F_51N-ANSIEI-Char.ai
1.1
2 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]
10 s
60 s
t
E
>
inv
t
E
>>
inv
5 s
0.5 s
1 s
0.2 s
0.1 s
0.02 s
t =
t
E
>
inv
·
[(I
E
/I
E
>
inv
)
2
-1]
5.64
+ 0.024
t =
t
E
>>
inv
·
[(I
E
/I
E
>>
inv
)
2
-1]
5.64
+ 0.024
Note: match of operating and setting time takes place when I
E
/I
E
>
inv
or I
E
/I
E
>>
inv
= 2.789