EMR-5000
IM02602012E
51X INV Measured Ground Fault Protection
Elements
51X[1] ,51X[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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