VAMP 210 - Page 47

VAMP Ltd Generator protection relay
Technical description
VAMP 210
VM210.EN004 Vamp 24h support phone: +358 (0)20 753 3264
13
Figure 2.2.1-6 Long Time Inverse (IEC 60255-3) characteristic.
1
120
−
⎟
⎠
⎞
⎜
⎝
⎛
>
⋅=
I
I
k
t
(See explanation for formula on page 10.)