05_discharg_barrie_g - IEEE Transactions on Dielectrics and...

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IEEE Transactions on Dielectrics and Electrical Insulation Vol. 12, No. 4; August 2005 1070-9878/05/$20.00 © 2005 IEEE 725 Computer Modeling of Interaction of Gas Discharge Plasma with Solid Dielectric Barriers Yuriy V. Serdyuk and Stanislaw M. Gubanski Chalmers University of Technology 412 96 Gothenburg, Sweden ABSTRACT A computer model describing charge transfer in a system consisting of two parallel- plate metallic electrodes covered with solid dielectric barriers immersed in gas medium is proposed. The material of the barriers is supposed to be a non-ideal insulator whose properties correspond to polyethylene and air is considered as a gas phase. The model is based on continuity equations for fluxes of charge carriers and accounts for their drift and diffusion and also for different sources of their generation and losses in different media. The continuity equations are coupled with Poisson’s equation for computing electric fields affected by temporal and spatial variations of space charges in the system. Results of the computer simulations are obtained for the case when the applied field in the gas exceeds its breakdown threshold, i.e. charge transfer in the gas phase takes place in the form of an electrical discharge (electron avalanche and streamer). Evolution of generated discharge plasma is analyzed taking into account conditions on gas-solid interfaces and in the bulk of the solid dielectric barriers. Index Terms Space charge, charge injection, charge transport, electron avalanche, streamer propagation, dielectric barriers, barrier discharge. 1 INTRODUCTION Charge transport in a gas media (usually called “gas discharge”) associated with its deposition on solid dielectric surfaces is the physical phenomenon taking place in many high voltage applications. In some cases, it is the main background process, which technology utilizes, e.g. ozone generation in a barrier discharge [1], polymer surface treatment [2], preparation of electrets [3], concept of “active” insulation [4], etc. In other cases, it is an undesirable phenomenon potentially leading to unrecoverable damages of an insulation system, e.g. partial discharges in defects, sliding discharges over insulating surfaces (tracking), etc. Different situations can be observed when analyzing time and space evolution of a gas discharge depending upon the orientation of the dielectric in the applied field. In the present study, we concentrate on an electrical discharge in a gas between two parallel plate electrodes covered with layers of solid insulating materials. Thus, charge transfer occurs mostly due to the axial (normal to the surface) component of the field. Such an arrangement is typical for barrier discharges. Numerous publications were devoted to studies of different
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05_discharg_barrie_g - IEEE Transactions on Dielectrics and...

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