Woodward HighPROTEC - Page 684

Protective Elements
IEC Long Time 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
>
.
684 MCDGV4 DOK-HB-MCDGV4-2E
0.01 0.1 1 10 100
0.1
1
10
100
1000
0.05
0.1
0.2
0.5
1
1.5
t [s]
I / I> (multiples of pickup)
tchar=
Pdoc_Z03
Reset Trip
»Char« = IEC LINV
≤ 20
t
− 1
120
=
I
I>
If:
I
I>
1 <
tchart
1−
120
=
I
I>
2
If: < 1
I
I>
tchar