Thytronic Pro-N NVA100X-D

362
NVA100X-D - Manual - 02 - 2016
APPENDIX
Negative sequence overcurrent 46M - Electromechanical inverse curves (EM)—
F_46LT-EM-Char.ai
1.1
2345678 9 10 20
I
2
/I
2
>inv
0.01
0.1
1
10
100
1000
10000
t [s]
60 s
t
2
>
inv
10 s
5 s
1 s
0.5 s
0.2 s
t
2
>
inv
= 0.1 s
t
2
>
inv
= 0.02 s
Note: match of operating and setting time takes place when I
2
/I>
inv
= 4
t =
t
2
>
inv
·
[-0.236 · (I
2
/I
2
>
inv
)
-1
+0.339]
0.28