VAMP Ltd
Overcurrent and earth-fault relay
Technical description
VAMP 140
VM140.EN011
Vamp 24h support phone +358 (0)40 573 6316
9
Figure 2.2.1-3 Normal Inverse (IEC 60255-3) characteristic.
[ ]
1
14
,
0
02
,
0
−
⎟
⎠
⎞
⎜
⎝
⎛
>
⋅
=
I
I
k
s
t
t[s] = Trip
time
k =
Time
multiplier
I =
Measured
current
I>
= I set current