7. Earth fault protection for radial networks with direct neutral to earth
7.1 Earth faults in direct neutral to earth
Generally speaking, since most networks are overhead, capacitive currents can be neglected in comparison with the current flowing in the faulted feeder. If we were to take them into account, the calculation would be complicated: on the one hand, the capacitances are distributed, and on the other, the residual voltage varies along the line according to many factors, in particular the short-circuit power of the network and the impedances of the conductors up to the fault location.
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Earth fault protection for radial networks with direct neutral to earth
Resistant fault detection
Bibliography
- (1) - WILLHEM (R.), WATERS (M.) - Neutral grounding in high voltage transmission. - Elsevier publishing company.
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- Postes de livraison établis à l'intérieur d'un bâtiment et alimentés par un réseau de distribution publique HTA (jusqu'à 33 kV) - NF C13-100 -
- Installations électriques à haute tension pour les sites de production d'énergie électrique, les sites industriels, tertiaires et agricoles - NF C13-200 -
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