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360
NVA100X-D - Manual - 02 - 2016
APPENDIX
Phase overcurrent 50/51 side H and side L - 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
(H)
>inv
I
/
I
(H)
>>inv
I
/
I
(L)
>inv
I
/
I
(L)
>>inv
0.01
0.1
1
10
100
1000
10000
t
[s]
60 s
10 s
10 s
5 s
5 s
1 s
0.5 s
0.2 s
t
>
inv
= 0.1 s
t
>
inv
= 0.02 s
t
=
t
(H)
>
inv
t
(H)
>
inv
t
(L)
>
inv
t
(H)
>>
inv
t
(L)
>>
inv
·
[(
I
/
I
(H)
>
inv
)
2
]
16
t
=
t
(L)
>
inv
·
[(
I
/
I
(L)
>
inv
)
2
]
16
t
=
t
(H)
>>
inv
·
[(
I
/
I
(H)
>>
inv
)
2
]
16
t
=
t
(L)
>>
inv
·
[(
I
/
I
(L)
>>
inv
)
2
]
16
Note: match of operating and setting time takes place when I/I
(H)
>
inv
or I/I
(L)
>
inv
= 4