A. Soliman

Publications (2)0 Total impact

• Article: Design of Field-Controlled Multi-Layer Insulation System

  M. M. A. Salama, R. Hackam, A. Soliman
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  ABSTRACT: A novel method is proposed and validated experimentally to increase the breakdown voltage of an insulating system for applications in the electrical insulation of large power equipment. The method relies on controlling the electric field within a multilayer insulation system. The insulation system is constructed from n layers of insulation and m very thin conducting strips placed between successive insulating layers. The conducting strip at each layer is symmetrically shifted by a constant distance determined from a shifting factor which is calculated to maximize the withstand voltage of the insulation. The potential distribution within the composite insulation is determined from the solution of the Laplace equation for different design parameters, and it is shown that the field can be reduced for a proper choice of the dimensions of the system. A composite insulation system based on the proposed method has been fabricated and tested for ac (60 Hz) and impulse voltages. Substantial improvements in the withstand voltage are obtained over an identically sized system without the conducting strips, thus validating the analysis presented in this paper.
  IEEE Transactions on Electrical Insulation 05/1986;
• Article: Methods Of Calculations Of Field Stresses In A Three-Core Power Cable

  M.M.A. Salama, A. Nosseir, R. Hackam, A. Soliman, T. El-Shiekh
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  ABSTRACT: A numerical method using the charge simulation technique with only a small number of line charges is developed to calculate the electric field everywhere in a three-core high voltage, high power belted cable. Only six line charges are used of which three lines represent the three conductors and three image line charges to take account of the grounded sheath. The locations of the maximum electric stress in the cable are determined. Experimental measurements is also carried out using an electrolytic tank to verify the calculations. Good agreement is obtained. The results are presented in a normalized format so that they can readily be applied.
  IEEE Transactions on Power Apparatus and Systems 01/1985;