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Titre: An approach in the improvement of the reliability of impedance relay
Auteur(s): Ouahdi, D.
Ladjeroud, R.
Habi, I.
Mots-clés: Distance Protection
Fault Detection
Negative sequence
Overload
Transmission line
Date de publication: 2008
Collection/Numéro: World academy of science, engineering and technology/ Vol.2 (2008);p.p. 246-250
Résumé: The distance protection mainly the impedance relay which is considered as the main protection for transmission lines can be subjected to impedance measurement error which is, mainly, due to the fault resistance and to the power fluctuation. Thus, the impedance relay may not operate for a short circuit at the far end of the protected line (case of the under reach) or operates for a fault beyond its protected zone (case of overreach). In this paper, an approach to fault detection by a distance protection, which distinguishes between the faulty conditions and the effect of overload operation mode, has been developed. This approach is based on the symmetrical components; mainly the negative sequence, and it is taking into account both the effect of fault resistance and the overload situation which both have an effect upon the reliability of the protection in terms of dependability for the former and security for the latter
URI/URL: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/207
Collection(s) :Publications Internationales

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