EDR-3000 IM02602003E
51R INV Calculated Ground Fault Protection
Elements
51R[1] ,51R[2]
All ground current elements are identically structured.
For each element the following characteristics are available:
•NINV (IEC/XInv);
•VINV (IEC/XInv);
•LINV (IEC/XInv);
•EINV (IEC/XInv);
•MINV (ANSI/XInv);
•VINV (ANSI/XInv);
•EINV (ANSI/XInv);
•Thermal Flat;
•IT;
•I2T; and
•I4T.
For tripping curves please refer to the “Appendix/Time Current Curves (Ground Current)” section.
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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