EDR-5000 IM02602007E
All ground current protective elements can be planned user defined as non-directional or as directional stages. This
means, for instance, all elements can be projected in forward/reverse direction.
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 “Time Current Curves (Ground Current)” 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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