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Modélisation dynamique des décharges se propageant sur des surfaces isolantes polluées avec des dépôts discontinus sous différentes formes de tension

Abstract : This work presents an autonomous and dynamic model of prediction of the characteristics of discharges propagating on polluted insulating surfaces in a discontinuous way, based on the energy balance, the equivalent electric circuits, and the physical characteristics of the arc. This model allows to determine the various parameters of the discharge until the flashover by taking into account the insulator geometry, the change of resistance during the propagation, the type of pollution band and its characteristics (conductivity, thickness, width, position compared to the electrodes). The voltage evolution at the head of arc and the voltage drop within the arc are analysed according to the kind of applied voltage. It is shown that the location of the pollution bands with regards to the electrodes, their widths, their thickness and their conductivities (weakly or strongly polluted) have significant influence on the parameters of the discharge. The increase of thickness of the pollution band leads to the increase of the resistance of the arc and to the reduction of the accumulated charge and thus to the decrease of the charging current. Note that the thicker the pollution layer, the shorter the time to flashover of the insulator is. Moreover, the flashover voltage is all the smaller as the flashover time is long. The high conductivity of the pollution layers generates high currents. The higher the ratio between the conductivities of the various bands, the higher the current and the charge are; this can be explained by the remarkable increase of the radius of the discharge channel. The evolution of velocity follows those of the currents and electrical charges.
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Submitted on : Monday, January 28, 2008 - 12:52:52 PM
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  • HAL Id : tel-00220521, version 1

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Siméon Diampeni Kimbakala. Modélisation dynamique des décharges se propageant sur des surfaces isolantes polluées avec des dépôts discontinus sous différentes formes de tension. Energie électrique. Ecole Centrale de Lyon, 2007. Français. ⟨tel-00220521⟩

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