Thytronic Pro-N NVA100X-D - Ground Directional Overcurrent 67 N(Comp) - Extremely Inverse Time Curve (IEC 60255-3;BS142 Type C)

340
NVA100X-D - Manual - 02 - 2016
APPENDIX
1.1
2 3 4 5 6 7 8 9 10 20
I
ECH
/I
EDC
>
inv
I
ECL
/I
EDC
>
inv
0.01
0.1
1
10
100
1000
10000
100000
t [s]
10 s
60 s
5 s
1 s
0.5 s0.2 s0.02 s 0.1 s
Nota: il tempo d’intervento impostato è riferito ad un valore di corrente pari a I
ECL
/I
EDC
>
inv
o I
ECH
/I
EDC
>
inv
= 9
F_67N(Comp)-IECBC-Char.ai
t
EDC
>
inv
t =
t
EDC
>
inv
·
[(I
ECH
/I
EDC
>
inv
)
2
-1]
80
t =
t
EDC
>
inv
·
[(I
ECL
/I
EDC
>
inv
)
2
-1]
80
Ground directional overcurrent 67N(Comp) - Extremely inverse time curve (IEC 60255-3/BS142 type C)—