Thytronic NA11

144
144
NA11 - Manual - 02 - 2009
APPENDIX
Phase overcurrent 50/51 - Electromechanical inverse curves (EM)
F_51-EM-Char.ai
1.1
234567 8 910 20
I /I>inv
0.01
0.1
1
10
100
1000
10000
t [s]
t>
inv
=
60 s
t>
inv
=
10 s
t>
inv
=
5 s
t>
inv
=
1 s
t>
inv
=
0.5 s
t>
inv
=
0.2 s
t>
inv
= 0.1 s
t>
inv
= 0.02 s
t =
t>
inv
·
-0.236 · [(I/I>
inv
)
-1
-0.339]
0.28
Note: match of operating and setting time takes place when I/I>
inv
= 4