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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Indonesian Journal of Electrical Engineering and Computer Science
Ali. A. Salem
University Tun Hussein Onn Malaysia
Control & Systems Engineering Electrical & Electronics Engineering

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Proposal of a dynamic numerical approach in predicting flashover critical voltage Ali. A. Salem; R. Abd-Rahman; M. S. Kamarudin; H. Ahmad; N.A.M. Jamail; N.A. Othman; M.T. Ishak; M.N.R. Baharom; S. Al-Ameri
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 10, No 2: June 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.567 KB) | DOI: 10.11591/ijpeds.v10.i2.pp602-610

Abstract

Glass insulators, due to its diverse characteristics, were used widely around the world for high voltage transmission lines. Surfaces of the insulators are exposed to high electrical, mechanical, and thermal stresses over the period of service. Accumulation of contamination distort stresses distribution along the insulators that may lead to flashover under severe condition. In this paper, Obenaus pollution model has been adopted to propose a dynamic mathematical modelling to determine flashover critical voltage with regard to parameters such as pollution conductivity, arc length, and width of layer of contamination on the surface of glass insulator. In addition, laboratory experimental works have been carried out according to IEC60305 to validate the results from numerical approach, which indicate a good agreement.
Modeling frequency response of transformer winding to investigate the influence of RLC S Al-Ameri; M. F. M. Yousof; Norhafiz Azis; S. Avinash; M. A. Talib; Ali. A. Salem
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 1: April 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v14.i1.pp219-229

Abstract

Frequency response measurements are used for power transformer winding failures detection. The variation between frequency responses indicate mechanical changes in the transformer winding. One method to investigate winding failures in transformer is to develop a reliable circuit model which can simulate the frequency response of an actual winding. The main reason to use the model is because it is expensive to create damages on an actual winding. This paper proposes n-stages circuit ladder network to simulate the response of a winding which has unique design. It presents a new technique to calculate the resistance, inductance and capacitance of the winding. Then, the relationship between the RLC parameters and the frequency response is studied. The winding chosen in this investigation is a single phase 33kV transformer winding. The simulated frequency response was compared with the measured response to verify the proposed model. The model can give a comprehensive understanding about the effect of RLC parameters on the frequency response.
Co-Authors H. Ahmad M. A. Talib M. F. M. Yousof M. S. Kamarudin M.N.R. Baharom M.T. Ishak N.A. Othman N.A.M. Jamail Norhafiz Azis R. Abd-Rahman S Al-Ameri S. Al-Ameri S. Avinash