Journal ArticleDOI
Leader Propagation Model for Predetermination of Switching Surge Flashover Voltage of Large Air Gaps
B. Hutzler,D. Hutzler-Barre +1 more
TLDR
In this article, the breakdown voltage of an air gap submitted to switching surges may be determined by using a mathematical model of leader propagation, which is applied to point plane gaps, for which a number of experimental results are available.Abstract:
The breakdown voltage of an air gap submitted to switching surges may be predetermined by use of a mathematical model of leader propagation. This model is applied, in this article, to point plane gaps, for which a number of experimental results are available. It is possible to similate the development of a flashover: current, speed, visual appearence. U50 voltage and standard deviation may be deduced by simulation of test sequences and, as a result, the variations of these parameters, when the length of the gap and the shape of the applied wave vary, may be studied. Generally, results are found to be in accordance with experiments.read more
Citations
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Journal ArticleDOI
A prediction method for breakdown voltage of typical air gaps based on electric field features and support vector machine
TL;DR: In this paper, a new prediction method for the breakdown voltages of typical air gaps based on the electric field features and support vector machine (SVM) was proposed, and the predicted results agree well with experimental values and simulated results of the published models.
Journal ArticleDOI
Triggering and guiding of an upward positive leader from a ground rod with an ultrashort laser pulse. II. Modeling
D. Comtois,H. Pépin,F. Vidal,F.A.M. Rizk,C. Y. Chien,T. W. Johnston,J. C. Kieffer,B. La Fontaine,François Martin,C. Potvin,P. Couture,H.P. Mercure,A. Bondiou-Clergerie,P. Lalande,I. Gallimberti +14 more
TL;DR: In this article, the authors used the Bondio-Gallimberti model of positive leader propagation to simulate laboratory experiments of laser triggering and guiding of upward leaders initiated from a ground rod.
Journal ArticleDOI
Early streamer emission lightning protection systems: An overview
TL;DR: Early streamer emission (ESE) lightning protection systems are a relatively new approach to the perennial problem of lightning damage, and these systems may hold promise for a more effective protection against lightning as mentioned in this paper.
Journal ArticleDOI
Hybrid prediction of the power frequency breakdown voltage of short air gaps based on orthogonal design and support vector machine
Zhibin Qiu,Jiangjun Ruan,Daochun Huang,Mengting Wei,Liezheng Tang,Congpeng Huang,Wenjie Xu,Shengwen Shu +7 more
TL;DR: In this article, a hybrid model is established to predict the power frequency breakdown voltage of three typical air gaps including sphere-sphere, rod-plane, and rod-rod gaps.
Journal ArticleDOI
A method for breakdown voltage prediction of short air gaps with atypical electrodes
TL;DR: In this paper, a support vector machine (SVM) model was used to predict the breakdown voltage of inter-electrode air gaps with different electrode geometries and atypical electrodes.
References
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Journal ArticleDOI
A Charge Simulation Method for the Calculation of High Voltage Fields
TL;DR: In this paper, a numerical method for the computation of electrostatic fields is described, based on the use of fictitious line charges as particular solutions of Laplace's and Poisson's equations.
Journal ArticleDOI
Switching surge strength of large air gaps: A physical approach
G. Carrara,L. Thione +1 more
TL;DR: In this paper, a method is introduced for the determination of the sparkover voltage of practically any configuration subjected to switching impulses of any polarity, applied to one or more electrodes When the discharge process is governed by the phenomena occurring at a positively charged electrode.
Journal ArticleDOI
Field-enhanced propagation of corona streamers
TL;DR: In this article, the lengths of positive and negative streamers, propagating within a region characterized by a uniform electric field, are determined as a function of field strength, and the results suggest that positive streamer processes may be very important in charge drainage and in altering the droplet charge spectrum.
Journal ArticleDOI
General expression for positive switching impulse strength valid up to extra long air gaps
TL;DR: In this article, a new algebraic expression for critical sparkover voltage (CSOV) subair insulation submitted to positive switching impulses was established for all practical gap configurations in the distance range 1 to at least 30 m.
Journal ArticleDOI
Breakdown phenomena of long gaps under switching impulse conditions influence of distance and voltage level
Abstract: The influence of the different phases of the discharge on the statistics of the breakdown processes has been investigated in a wide range of gap lengths (from 2 to 10 m) and applied voltage levels. The effect of the field distribution, along the gap and of the overvoltage ratio upon the development of each discharge phase, has been studied and the transition between subsequent phases has been analysed. The experimental results have been compared with theoretical predictions; the satisfactory agreement, which has been obtained indicates that the theoretical simulation of the discharge phenomena is relatively advanced and starts to be useful from a engineering point of view.
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Theoretical modelling of the development of the positive spark in long gaps
A Bondiou,I Gallimberti +1 more