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All Journal International Journal of Electrical and Computer Engineering TELKOMNIKA (Telecommunication Computing Electronics and Control) Indonesian Journal of Electrical Engineering and Computer Science
Osama Elsayed Gouda
Cairo University
Computer Science & IT Electrical & Electronics Engineering

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 1 
Factors Affecting the Sheath Losses in Single-Core Underground Power Cables with Two-Points Bonding Method Osama Elsayed Gouda; Adel Abd-eltwab Farag
International Journal of Electrical and Computer Engineering (IJECE) Vol 2, No 1: February 2012
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (441.299 KB)

Abstract

Single-core underground power cables with two-points bonding induce currents in their metallic sheaths. The sheath induced currents are undesirable and generate power losses and reduce the cable ampacity. This paper has shown that the values of the sheath losses in some cases could be greater than conductor losses, depending on various factors. Such these factors are type of cable layouts, cable parameters, cable spacing, sheath resistance, phase rotation, conductor current and cable armoring. In this paper the above factors have been investigated. The calculations are carried out depending mainly on IEC 60287 by a proposed computer program using MATLAB.Keywords: Single-core cables, two-point bonding method, sheaths losses, flat, trefoil, armoringDOI:http://dx.doi.org/10.11591/ijece.v2i1.115
Comparasion between Oil Immersed and SF6 Gas Power Transformers Ratings Osama Elsayed Gouda; Mohamed Dessoky Ali; Ali-Hassan Ali-Hassan
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 10, No 1: March 2012
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v10i1.797

Abstract

           Power transformers present the largest portion of the capital investment in addition the power transformer remains oil immersed which presents a fire hazard that is particularly objectionable in urban and metropolitan environment. After careful studies of various alternatives to conventional transformer technology to produce a gas insulated power transformer with increased mega volt-ampere ratings, gas insulated power transformer has been developed with a use with non flammable SF6 gas. For changing the insulating material from oil to SF6 gas a comparative study between these types of transformers should be made. In this paper two mathematical models are suggested and simulated by computer programs to calculate the temperature of the cooling mediums and transformer windings. The obtained results are in agreement wit the measured values in the field.
Mitigation of Magnetic Field under Double-Circuit 220kV Overhead Transmission Line Osama Elsayed Gouda; Adel Z. El Dein
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 8: December 2012
Publisher : Institute of Advanced Engineering and Science

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This paper studies the effect of various mitigation loop configurations namely: single horizontal mitigation loop (two conductors), two separate horizontal mitigation loops (four conductors) and single vertical mitigation loop (two conductors), on the magnetic field produced by 220kV double-circuit overhead transmission line. Also, in this paper a further reduction in the magnetic field is achieved by inserting properly-selected capacitors within these mitigation loops. The obtained results indicate that the reduction in the magnetic field by using these mitigation loops largely depends on the arrangements and the locations of these loops with respect to the conductors of 220kV double-circuit overhead transmission line. DOI: http://dx.doi.org/10.11591/telkomnika.v10i8.1521
Improving the Dielectric Properties of High Density Polyethylene by Incorporating Clay-Nano Filler Osama Elsayed Gouda; Sohair F. Mahmoud; Ahmed A. El-Gendy; Ahmed S. Haiba
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i12.pp7987-7995

Abstract

Polymer Nano composites have been used for various important industrial applications. The preparation of high density polyethylene composed with Na-montmorillonite Nano filler using melt compounding method for different concentrations of clay-Nano filler of 0%, 2%, 6%, 10%, and 15% has been successfully done. The morphology of the obtained samples was optimized and characterized by scanning electron microscope showing the formation of the polymer Nano composites. The thermal stability and dielectric properties were measured for the prepared samples. Thermal gravimetric analysis results show that thermal stability in polymer Nano composites is more than that in the base polymer. It has been shown that the polymer Nano composites exhibit some very different dielectric characteristics when compared to the base polymer. The dielectric breakdown strength is enhanced by the addition of clay-Nano filler. The dielectric constant and dissipation factor have been studied in the frequency range 200 Hz to 2 MHz at room temperature indicating that enhancements have been occurred in dielectric constant and dissipation factor by the addition of clay-Nano filler in the polymer material when compared with the pure material.
Co-Authors Adel Abd-eltwab Farag Adel Z. El Dein Ahmed A. El-Gendy Ahmed S. Haiba Ali-Hassan Ali-Hassan Mohamed Dessoky Ali Sohair F. Mahmoud