Abstract
The space charge dynamic plays a very important role in the aging and breakdown of polymeric insulation materials under high voltage. This is due to the intensification of the local electric field and the attendant chemical–mechanical effects in the vicinity around the trapped charge. In this paper, we have investigated the space charge dynamic in low-density polyethylene under high direct-current voltage, which is evaluated by experimental conditions. The evaluation is on the basis of simulation using a bipolar charge transport model consisting of charge injection, transports, trapping, detrapping, and recombination phenomena. The theoretical formulation of the physical problem is based on the Poisson, the continuity, and the transport equations. Numerical results provide temporal and local distributions of the electric field, the space charge density for the different kinds of charges (net charge density, mobile and trapped of electron density, mobile hole density), conduction and displacement current densities, and the external current. The result shows the appearance of the negative packet-like space charge with a large amount of the bulk under the dc electric field of 100 kV/mm, and the induced distortion of the electric field is largely near to the anode, about 39% higher than the initial electric field applied.
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Acknowledgements
This work was supported by Laboratory Research & Development Materials Semiconductors and Dielectrics, LEDMaSD, Faculty of Technology, University Amar Telidji, Laghouat -Algeria.
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Boukhari, H., Rogti, F. Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress. J. Electron. Mater. 45, 5334–5340 (2016). https://doi.org/10.1007/s11664-016-4723-y
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DOI: https://doi.org/10.1007/s11664-016-4723-y