Woodward HighPROtec MCDLV4, Manual

Page: 724 / 1275

Protective Elements
ANSI Very Inverse
Various reset modes are available:
Resetting via characteristic, delayed and instantaneous.
Remark: For
I
G
> 20⋅
I
G>
, the curve stops decreasing, the t-values are kept constant at the value for
I
G
= 20⋅
I
G>
.
724 MCDLV4 DOK-HB-MCDLV4-2E
0.5
1
2
5
10
15
0.01 0.1
1 10 100
0.1
1
10
100
1000
t [s]
IG / IG> (multiples of pickup)
tchar=
E
d
o
c
_Z
0
6
»Char« = ANSI VINV
Reset Trip
t
−1
19.61
=
IG
IG>
2
tchar + 0.491
t
1−
21.6
=
IG
IG>
2
tchar
≤ 20 If:
IG
IG>
1 < If: < 1
IG
IG>