EMR-4000
IM02602009E
50R DEFT Calculated Ground Fault Protection Module
Elements
50R[1] ,50R[2]
If using inrush blockings, the tripping delay of the ground current
protection functions must be at least 30 ms or more in order to prevent
faulty trippings.
All ground current elements are identically structured.
For each element, the following characteristics are available:
•
DEFT (definite time).
For tripping curves please refer to “Instantaneous Current Curves (Ground Current Calculated)” located in the
Appendix.
The ground current can be measured either directly via a zero sequence transformer or detected by a residual
connection. The ground current can alternatively be calculated from the phase currents. However, this is only possible
if the current transformers are Wye-connected.
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