Woodward HighPROtec MCDLV4, Manual

Page: 681 / 1275

Protective Elements
IEC Normal 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
>
.
681 MCDLV4 DOK-HB-MCDLV4-2E
0.01 0.1 1 10 100
0.01
0.1
1
10
100
t [s]
I / I> (multiples of pickup)
0.05
0.1
0.2
0.5
1
1.5
tchar=
Reset Trip
Pd
oc
_Z
0
1
»Char« = IEC NINV
t
1−
0.14
=
I
I>
2
If: < 1
I
I>
≤ 20
t
−1
0.14
=
I
I>
0.02
If:
I
I>
1 <
tchar
tchar