Woodward highprotec MRI4, User Manual

Page: 453 / 727

Protective Elements
IG> - Earth Fault [50N/G, 51N/G]
Available elements:
IG[1] ,IG[2] ,IG[3] ,IG[4]
If you are using inrush blockings the tripping delay of the earth current
protection functions must be at least 30 ms or more in order to prevent faulty
trippings.
All earth current elements are identically structured.
This module offers Adaptive Parameter Sets.
Parameters can be modified within parameter sets dynamically by means of
Adaptive Parameter Sets.
Please refer to chapter Parameter / Adaptive Parameter Sets.
The following table shows the application options of the earth overcurrent protection element
Applications of the IE-Protection Module Setting in Option
ANSI 50N/G – Earth overcurrent protection,
non directional Device Planning menu
Setting: non directional Measuring Mode:
Fundamental/TrueRMS
ANSI 51N/G – Earth short circuit protection,
non directional Device Planning menu
Setting: non directional Measuring Mode:
Fundamental/TrueRMS
Measuring Mode
For all protection elements it can be determined, whether the measurement is done on basis of the »
Fundamental«
or if »
TrueRMS« measurement is used.
453 MRI4 DOK-HB-MRI4-2E