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ANN approaches to determine the dielectric strength improvement of MgO based low density polyethylene nanocomposite

Journal of Advanced Dielectrics 2021年第4期11卷 27-36页

作者： Sherif Haggag loai nasrat Hanafy Ismail Faculty of Engineering Department of Power and Machines Ain Shams UniversityCairoEgypt Faculty of Engineering Department of Electrical Engineering Aswan University AswanEgypt

This paper presents the modification occurred to the dielectric strength feature of low density polyethylene compounded with nano magnesia(LDPE/MgO).MgO nanoparticles were prepared using sol-gel technique,MgO filler surface was functionalized to improve the interfacial ***’s groups of composites with different filler concentrations were fabricated by mix blend *** exposed to various salinity media by immersion,dielectric strength test was applied on each set according to relevant ASTM standard with identical testing *** results were statistically processed then compared to the pristine *** results utilized to learn Artificial Neural Network in order to acquire the value of dielectric strength of compounds having similar composition but containing different doping amounts or influenced with various salinity level *** dielectric strength is enhanced by the addition of MgO *** the investigation of the obtained results,it is concluded that additives of 1.4%filler concentration by weight is the optimum MgO content for LDPE/MgO nanofiller *** think that this paper may promote a good researching methodology that gather both empirical work and numerical tools in this field.

关键词： Polymer nanocomposites salinity surface treatment breakdown strength artificial neural network

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Improvement of Used Transformer Oils with Activated Bentonite

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Engineering（科研） 2011年第6期3卷 588-593页

作者： loai nasrat Mohamed Abdelwahab Gamal Ismail 不详

This research presents the evaluation of activated Bentonite material for treatment of used transformer oil. Different properties such as;electrical, physical, chemical and thermal of used transformer oil were meas-ured before and after purification and treatment. Two power transformers were used in this research (6.4: 4.6 MVA, 3 phases, 50 Hz). One of them was filled with purified oil and the other was filled with activated Bentonite treated oil after purification, and then the two power transformers were tested for one year under practical conditions of the operating field. Initial tests have indicated that the use of Activated BENTONITE in the treatment process for the aged transformer oil improved breakdown voltage, water content, total acidi-ty and flash point. Thus activated Bentonite gives an ideal treatment of aged transformer oil with its environmental and economic advantages. Moreover, activated Bentonite is available at many places in Egypt with low costs.

关键词： Aged Transformer Oil Bentonite Breakdown Voltage Physical and Thermal Properties

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Aging Effect on Characteristics of Oil Impregnated Insulation Paper for Power Transformers

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Engineering（科研） 2013年第1期5卷 1-7页

作者： loai S. nasrat Nesrine Kassem Nadia Shukry Cellulose and Paper Department National Research Center Cairo Egypt Electrical Engineering Department Faculty of Engineering South Valley University Aswan Egypt

This paper deals with experimental investigations of the electrical and physical properties of oil impregnated insulation paper for power transformers at different temperatures. The ac breakdown voltage, tensile strength and water content of insulation papers impregnated in mineral oil for different time periods were investigated. The effect of insulation paper thickness on the electrical and mechanical properties has also been studied. The results showed that the breakdown voltage and the tensile strength decreased with increasing the time of immersion of insulation paper in oil at room temperature, at 5℃ and at -12℃. Also, the thermal aging effect on the characteristic of insulation paper has been studied. It was found that high temperatures affect the breakdown voltage and the tensile strength to a great extent.

关键词： Insulation Paper Power Transformers Aging Breakdown Voltage Tensile Strength Water Content

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