Woodward highprotec MRI4, User Manual

Page: 429 / 727

Protective Elements
Thermal Curve I2T
Various reset modes are available:
Resetting via characteristic, delayed and instantaneous.
429 MRI4 DOK-HB-MRI4-2E
0.5
1
2
5
10
0.01 0.1
1 10 100
0.01
0.1
1
10
100
1000
t [s]
I / In (multiples of the nominal current )
tchar=
P
d
o
c_
Z
1
0
»Char« = I2T
Reset Trip
t = 5
·
3
2
·
tchar
If: < 1
I
In
If:
I
In
1 <
t =
I
In
2
tchar
5
·
3
2