Woodward highprotec MRI4, User Manual

Page: 426 / 727

Protective Elements
R Inverse
Various reset modes are available:
Resetting via characteristic, delayed and instantaneous.
Remark: For
I > 20⋅I
>
, the curve stops decreasing, the t-values are kept constant at the value for
I = 20⋅I
>
.
426 MRI4 DOK-HB-MRI4-2E
≤ 20 If:
I
I>
1 <
0.01 0.1
1 10 100
0.1
1
10
100
0.05
0.1
0.2
0.5
1
1.5
t [s]
I / I> (multiples of pickup)
tchar=
P
d
o
c
_Z
1
2
»Char« = RINV
Reset Trip
t = tchar
1.0
t
1−
1.0
=
I
I>
2
If: < 1
I
I>
tchar
I
I>
−1
0.339−0.236