Woodward HighPROTEC - Page 686

Protective Elements
ANSI Very 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
>
.
686 MCDGV4 DOK-HB-MCDGV4-2E
0.5
1
2
5
10
15
0.01 0.1 1 10 100
0.1
1
10
100
1000
t [s]
I / I> (multiples of pickup)
tchar=
Pdoc_Z06
»Char« = ANSI VINV
Reset Trip
t
−1
19.61
=
I
I>
2
tchar+ 0.491
t
1−
21.6
=
I
I>
2
tchar
≤ 20If:
I
I>
1 <If: < 1
I
I>