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Article | REF: D4812 V1

Protection plan for medium-voltage public distribution networks - Implementation

Author: Michel ODDI

Publication date: May 10, 2011 | Lire en français

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    4. Earth-fault protection for compensated neutrals

    4.1 Mechanisms for the appearance and disappearance of an earth fault

    The principle of neutral-compensated networks is described in [D 4 811] , § 4.3.3. It shows that ground faults are generally not maintained, for lack of a sufficient arc current: they are usually self-extinguishing, i.e. the fault extinguishes by itself when the fault current reaches zero: we are dealing with transient phenomena, and we cannot use symmetrical components (Fortescue's theorem)...

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