Thytronic Pro-N NVA100X-D - Phase overcurrent 50;51 side H and side L - Electromechanical inverse curves (EM)

APPENDIX
363
NVA100X-D - Manual - 02 - 2016
Phase overcurrent 50/51 side H and side L - Electromechanical inverse curves (EM)—
F_51-EM-Char.ai
1.1
2345678 9 10 20
I /I
(L)
>inv
I /I
(H)
>inv
0.01
0.1
1
10
100
1000
10000
t [s]
60 s
10 s
5 s
1 s
0.5 s
0.2 s
0.1 s
0.02 s
Note: match of operating and setting time takes place when I/I
(H)
>
inv
or I/I
(L)
>
inv
= 4
t =
t
(H)
>
inv
·
[-0.236 · (I/I
(H)
>
inv
)
-1
+0.339]
0.28
t =
t
(L)
>
inv
·
[-0.236 · (I/I
(L)
>
inv
)
-1
+0.339]
0.28
t
(H)
>>
inv
t
(L)
>>
inv