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Induced effects on an overhead line due to nearby positive lightning downward leader

Fofana Issouf et Beroual Abderrahmane. (1998). Induced effects on an overhead line due to nearby positive lightning downward leader. Electric Power Systems Research, 48, (2), p. 105-119.

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URL officielle: http://dx.doi.org/doi:10.1016/S0378-7796(98)00089-...

Résumé

The evaluation of the risk of over voltages of atmospheric origin occurring on overhead power supply lines is useful for improving the co-ordination of insulation and electromagnetic compatibility. This paper discusses modelling of positive lightning downward leader and calculation of induced voltages on overhead lines produced by the later in a lightning discharge to ground. The procedure makes use of: (1) a lightning downward leader model based on an equivalent electrical network (a short presentation of the approach is given with a particular attention to the refinements); and (2) a coupling model based on the transmission line theory for field-to-overhead line coupling calculations. Taking into account some atmospheric conditions, the leader model enables to determine its electrical and physical parameters such as current, charge, velocity,… This model allows us to obtain at each step time, the leader distribution of charge along its channel and instantaneous velocity, contrary of the studies performed on lightning leader induced overvoltages, which used a constant value through the propagation. We calculate over voltages induced by very close lightning on a line assuming different strike points in the vicinity of the line. The obtained results are quite satisfactory.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:48
Numéro:2
Pages:p. 105-119
Version évaluée par les pairs:Oui
Date:15 Décembre 1998
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie électrique et génie électronique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:Local thermodynamic equilibrium, leader electric fields, strike location, équilibre thermodynamique local, champs électriques leader, emplacement de la grève
Déposé le:08 févr. 2021 22:52
Dernière modification:08 févr. 2021 22:52
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