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Tags: Investigation, Analysis, Inception, Voltage, Field, Distribution, Investigation and Analysis of Inception Voltage and Field Distribution, Investigation and Analysis of Inception Voltage and Field Distribution ppt, Investigation and Analysis of Inception Voltage and Field Distribution pdf,
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Investigation and Analysis of Inception Voltage and Field Distribution
#1


Authors:
samir Mohamed El-Makkawy
Abstract:
Partial discharge (P.D.) in micro cavities in the insulation of H.V. power cables drastically affect the performance, the field distribution and hence the rating of these cables. It is well known that, P.D. deteriorates power cables and lead to its complete failure. This has adverse effects on the reliability and maintainability of power supply, which affects directly the production of industrial factories. In this work a study and investigation of the effect of partial discharges in cavities in the solid insulation of H.V. power cables is carried out. The field distribution along that part of the conductor which lies within the triangle formed by joining the conductor centers will give the closest representation of the cable, and hence the rating of these cables were determined by modeling and simulation of these P.D. Cables three core power were tested and investigated at different voltages at low voltage, medium voltage and high voltage under alternating voltage at room temperature. The cavity shapes, spherical and cylindrical, with different sizes were tried. The insulation thickness was varied. The location of the micro cavity in the insulation was changed at different angles. The position of maximum electric stress in cables was determined. A developed simulation program using boundary element method was applied. The inception voltage was calculated and the applied voltage was changed as a function of the inception voltage.

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http://www.jee.ro/articles/WW1247053788W...c93bc4.pdf
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#2
Internal discharges into cavities in solid dielectric materials lead to degradation, deterioration and complete failure of insulating materials. This would shorten the life of electrical equipment, which affects the reliability of the power supply. This research is a research and study of internal discharges, such as magnitude and energy, into micro-cavities in solid dielectric samples. The field distribution in these cavities was simulated, modeled and calculated for some applied voltage. Alternating the high voltage at the power frequency at room temperature was applied with different values ​​of the initial voltage of the sample. The shape of the cavity, cylindrical and spherical, and its dimensions were changed, with the cross-sectional area of ​​the cavity much larger than its depth. The cavity size was much smaller than the sample thickness. The study was carried out on low density polyethylene (LDPE), polyvinyl chloride (P.V.C) and ethylene polypropylene rubber (E.P.R) due to its important industrial applications. The location of the cavity w.r.t la h.v. electrode in the dielectric sample was changed, to be in the center, adjacent to the h.v. electrode and near the ground electrode. The number of cavities was changed from one to three, either horizontally or in vertical or random formation in the sample. The permittivity of the dielectric ratio was changed from 2 to 10. The field distribution and its improvement within the cavity were calculated using a program developed using the boundary element technique. The magnitude of the field within the cavity was significantly increased by increasing the relative permittivity of the dielectric, its magnitude was expanded for the cavities adjacent to h.v. electrode.
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