Browsing by Author "ROUINI Abdelghani"

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    Influence of Air Microcavities on Electrical Field Distribution, Electromechanical Pressure and Dielectric Losses in High Voltage Cable Insulation
    (University of Eloued, 2019-02-24) ROUINI Abdelghani; AMEUR Aissa; LARBI Messaouda
    he origin of electrical discharges in high voltage cables insulation probably can be attributed to many causes such as: overvoltage and the presence of impurities which have been introduced into the insulation during the manufacturing step. These impurities may lead to electrical field increasing thus to the formation of partial discharges. The purpose of this work is to determine the effect comes from cavities presented in Cross-linked Polyethylene (XLPE) on the electrical field, temperature and electromechanical pressure distribution into and around the cavity. The calculation of these constraints is performed by the resolution of LAPLACE equation using Finite Difference Method (FDM)
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    Investigation of the Barriers Influence in the Air Gap Point-Plane by Electric Field Estimation
    (Universty Of El-oued جامعة الوادي, 2019-02-24) ROUINI Abdelghani; MAHI Djilali; LARBI Messaouda
    —In this paper ,we develop a model for three computation of the electric field in the presence of a space charge which is given in its turn after the knowledge of the effective ionization factor. The effect of the barriers in the intervals of air point-plan was the subject of several investigations; those showed that the influence of the barrier is especially related to the accumulation of loads on its surface on the active electrode side. Thus the barrier constitutes a mechanical and electrostatic obstacle with the increase in discharge. From an economic standpoint, the quality and dimensions of the barrier should not be the only criteria for the insulation coordination, in each system of HV electrodes. Results show that electric stress in the air gap decreases due to space charge left in the point-barrier gap, but it increases suddenly at the handle of the avalanches and on the upper barrier surface. This later effect related to the presence of the dielectric barrier is due to the polarization charge.