25-08-2017, 09:32 PM
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