Thytronic Pro-N NVA100X-D - Negative sequence overcurrent 46 M - I2 t inverse curves (I2 t=K)

APPENDIX
359
NVA100X-D - Manual - 02 - 2016
Negative sequence overcurrent 46M - I
2
t inverse curves (I2t=K)—
F_46M-I2t-Char.ai
1.1
2 34567 8910 20
I
2
/
I
2
>
inv
0.01
0.1
1
10
100
1000
10000
t [s]
t
2
>
inv
=
60 s
t
2
>
inv
=
10 s
t
2
>
inv
=
10 s
t
2
>
inv
=
5 s
t
2
>
inv
=
5 s
t
2
>
inv
= 1 s
t
2
>
inv
= 0.5 s
t
2
>
inv
= 0.2 s
t
2
>
inv
= 0.1 s
t
2
>
inv
= 0.02 s
t =
t
2
>
inv
·
[(I
2
/I
2
>
inv
)
2
]
16
Note: match of operating and setting time takes place when I
2
/I
2
>
inv
= 4