50X Deft Measured Ground Fault Protection - Eaton EMR-4000 Installation, Operation And Maintenance Manual

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50X DEFT Measured Ground Fault Protection

50X[1] ,50X[2]

For each element the following characteristics are available:

DEFT (definite time).

For tripping curves please refer to "Instantaneous Current Curves (Ground Current Measured)" 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.

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.

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