143
NA11 - Manual - 02 - 2009
APPENDIX
Phase overcurrent 50/51 - I
2
t inverse curves (I2t=K)
F_51-I2t-Char.ai
1.1
2
3
4
5
6
7
8 9 10
20
I
/
I
>inv
I
/
I
>>inv
0.01
0.1
1
10
100
1000
10000
t
[s]
t
>
inv
=
60 s
t
>>
inv
=
60 s
t
>
inv
=
10 s
t
>>
inv
=
10 s
t
>
inv
=
5 s
t
>>
inv
=
5 s
t
>
inv
= 1 s
t
>>
inv
= 1 s
t
>
inv
= 0.5 s
t
>>
inv
= 0.5 s
t
>
inv
= 0.2 s
t
>>
inv
= 0.2 s
t
>
inv
= 0.1 s
t
>>
inv
= 0.1 s
t
>
inv
= 0.02 s
t
>>
inv
= 0.02 s
t
=
t
>
inv
·
[(
I
/
I
>
inv
)
2
]
16
Note: match of operating and setting time takes place when I/I>
inv
= 4
Summary of Contents for NA11
Page 189: ...189 NA11 Manual 02 2009 APPENDIX...
