Woodward HighPROTEC - Page 681

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 MCDGV4 DOK-HB-MCDGV4-2E
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_Z01
»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