Eaton EDR 3000, Инструкция по установке, эксплуатации и обслуживанию, Страница: 434 / 770

EDR-3000 IM02602003E
50X DEFT Measured Ground Fault Protection
Elements
50X[1] ,50X[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 the “Appendix/Instantaneous Current Curves (Ground Current Measured)” 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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