Journal ArticleDOI
Lightning stroke simulation by means of the leader progression model. II. Exposure and shielding failure evaluation of overhead lines with assessment of application graphs
L. Dellera,E. Garbagnati +1 more
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TLDR
In this article, an extensive application of the leader progression (LP) model to the relevant geometrical configurations has been carried out, together with the method of analysis of the lightning exposure of transmission lines located in different orographic conditions.Abstract:
For pt.I see ibid., vol.5, no.4, p.2009-22 (1990). To evaluate the lightning performance of transmission lines, extensive application of the leader progression (LP) model to the relevant geometrical configurations has been carried out. Basic configurations used in the LP computer program are presented together with the method of analysis of the lightning exposure of transmission lines located in the different orographic conditions of flat countries, ridges of hills, and along a mountain side. A computer program used to evaluate shielding efficiency and the total number of strokes to the line is considered. A set of application graphs referring to the different orographic locations and including wide ranges of line heights, shielding angles, and insulation levels are given. >read more
Citations
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Journal ArticleDOI
Lightning stroke simulation by means of the leader progression model. I. Description of the model and evaluation of exposure of free-standing structures
L. Dellera,E. Garbagnati +1 more
TL;DR: In this article, a model of lightning-channel progression towards the Earth is given based on the latest knowledge on the physics of discharge in long air gaps, and the physical assessment of the electric field is done with the charge simulation method, which is adopted to input into a computer program all parameters involved in the progression of the negative downward channels toward the Earth and those involved in inception and propagation of upward positive channels from earthed structures.
Journal ArticleDOI
Modeling of transmission line exposure to direct lightning strokes
TL;DR: In this paper, a new model for assessing the exposure of free-standing structures and horizontal conductors above flat ground to direct lightning strokes is introduced, and a recently developed criterion for positive leader inception modified to account for positive leaders initiated under the influence of a negative descending lightning stroke is discussed.
Journal ArticleDOI
A self-consistent upward leader propagation model
Marley Becerra,Vernon Cooray +1 more
TL;DR: In this paper, a leader model was proposed to simulate the advancement of positive upward leaders by appealing to the presently understood physics of that process and the model properly simulates the upward continuous progression of the positive connecting leaders from its inception to the final connection with the downward stepped leader (final jump).
Journal ArticleDOI
Time dependent evaluation of the lightning upward connecting leader inception
Marley Becerra,Vernon Cooray +1 more
TL;DR: In this paper, a physical leader inception model is developed, which takes into account the electric field variations produced by the descending leader during the process of inception and accounts for the shielding effect produced by streamer corona and unstable leaders formed before the stable leader inception takes place.
Journal ArticleDOI
Survey of recent progress on lightning and lightning protection research
TL;DR: A review of recent progress on lightning and lightning protection research covering the following aspects: lightning locating and observation, lightning physics, lightning electromagnetic transients, and lighting protection for various systems as mentioned in this paper.
References
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Journal ArticleDOI
Lightning stroke simulation by means of the leader progression model. I. Description of the model and evaluation of exposure of free-standing structures
L. Dellera,E. Garbagnati +1 more
TL;DR: In this article, a model of lightning-channel progression towards the Earth is given based on the latest knowledge on the physics of discharge in long air gaps, and the physical assessment of the electric field is done with the charge simulation method, which is adopted to input into a computer program all parameters involved in the progression of the negative downward channels toward the Earth and those involved in inception and propagation of upward positive channels from earthed structures.
Journal ArticleDOI
Switching Impulse Strength of Phase-to-Earth UHV External Insulation Research at the 1000 kV Project
TL;DR: In this paper, the main results of system atic investigations, performed in the period 1978 -1983, as a part of the 1000 kV Project, on the switching impulse (SI) performance of UHV phase-to-earth external insulation are presented.
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Lightning stroke simulation by means of the leader progression model. I. Description of the model and evaluation of exposure of free-standing structures
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