6. Earth fault protection for radial networks with insulated neutral conductor
The construction of protection plans corresponding to cases of isolated neutral is not described in detail, as these neutral systems are less and less common, at least in Europe (there are still a few cases in Italy): we simply give a few general principles here.
in Asia, isolated neutral networks are widespread.
6.1 Calculating fault currents
The only possible way for a fault current to return to earth is via the feeder capacitances (figure 31 ).
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Earth fault protection for radial networks with insulated neutral conductor
Earth fault protection for radial networks with direct neutral to earth
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Bibliography
- (1) - WILLHEM (R.), WATERS (M.) - Neutral grounding in high voltage transmission. - Elsevier publishing company.
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