Thytronic Pro-N NVA100X-D - Residual Overcurrent 50 N.1;51 N.1, 50 N.2;51 N.2 E 50 N(Comp);51 N(Comp) - Moderately Inverse Time Curve (ANSI;IEEE Type MI)

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NVA100X-D - Manual - 02 - 2016
APPENDIX
Residual overcurrent 50N.1/51N.1, 50N.2/51N.2 e 50N(Comp)/51N(Comp) - Moderately inverse time curve
(ANSI/IEEE type MI)
—
F_51N-ANSIMI-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
0.02 s
0.2 s
0.1 s
0.5 s
t =
t
E1
>
inv
·
[(I
E1
/I
E1
>
inv
)
0.02
-1]
0.01
+ 0.023
t =
t
E2
>
inv
·
[(I
E2
/I
E2
>
inv
)
0.02
-1]
0.01
+ 0.023
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
= 1.664
t
E1>inv
t
E2>inv
t
EC>inv
t =
t
EC
>
inv
·
[(I
EC
/I
EC
>
inv
)
0.02
-1]
0.01
+ 0.023