Thytronic Pro-N NVA100X-D - Phase overcurrent 50;51 side H and side L - I2 t inverse curves (I2 t=K)

APPENDIX
361
NVA100X-D - Manual - 02 - 2016
Phase overcurrent 50/51 side H and side L - I
2
t inverse curves (I2t=K)—
F_67-I2t-Char.ai
1.1
2 345678 9 10 20
0.01
0.1
1
10
100
1000
10000
t [s]
I
PD
/I
PD
>inv
I
PD
/I
PD
>>inv
t
PD
>
inv
= 1 s
t
PD
>>
inv
= 1 s
t
PD
>
inv
= 0.5 s
t
PD
>>
inv
= 0.5 s
t
PD
>
inv
= 0.2 s
t
PD
>>
inv
= 0.2 s
t
PD
>
inv
= 0.1 s
t
PD
>>
inv
= 0.1 s
t
PD
>
inv
= 0.02 s
t
PD
>>
inv
= 0.02 s
t
PD
>
inv
= 10 s
t
PD
>>
inv
= 10 s
t
PD
>
inv
= 5 s
t
PD
>>
inv
= 5 s
t
PD
>
inv
= 60 s
t
PD
>>
inv
= 60 s
Note: match of operating and setting time takes place when I
PD
/I
PD
>
inv
= 4 or I
PD
/I
PD
>>
inv
= 4
t =
t
PD
>
inv
·
[(I
PD
/I
PD
>
inv
)
2
]
16
t =
t
PD
>>
inv
·
[(I
PD
/I
PD
>>
inv
)
2
]
16