Nagat M. K. Abdel-Gawad

Nagat M. K. Abdel-Gawad
Benha University · Electrical Engineering (Faculty of Engineering at Shoubra)

High Voltage Engineering

About

50
Publications
4,018
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
454
Citations
Citations since 2016
12 Research Items
274 Citations
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
Additional affiliations
January 2010 - July 2015
Benha University
Position
  • Professor Emeritus

Publications

Publications (50)
Article
Full-text available
Polymer nanocomposites used in underground cables have been of great interest to researchers over the past 10 years. Their preparation and the dispersion of the nanoparticles through the polymer host matrix are the key factors leading to their enhanced dielectric properties. Their important dielectric properties are breakdown strength, permittivity...
Article
Full-text available
The current study aims to develop polyvinyl chloride (PVC) nanocomposites with enhanced electrical and mechanical properties by incorporating titanium oxide (TiO(2)) nanoparticles within PVC chains. Different loading of nanoparticles and different nanoparticle surface states were considered. The surface states are unfunctionalised, functionalised u...
Article
Full-text available
This study aims to develop large‐scale polyvinyl chloride (PVC) nanocomposites for industrial application with power cables. To achieve this goal, PVC/silicon dioxide and PVC/titanium dioxide nanocomposites were fabricated with two different loadings of nanoparticles: 0.3 and 0.6 wt.%, in the presence of a suitable coupling agent that was used to r...
Conference Paper
Partial discharges (PDs) diagnostics are necessary to monitor and detect any abnormal conditions such as; impurities, voids or gas bubbles during the manufacturing process of insulating materials of power cables. This paper aims to enhance PD activity of polyvinyl chloride (PVC) with the insertion of chemically functionalized silicon dioxide (SiO2)...
Article
Manufacturing of a new insulation material for power cables has become necessary in order to withstand electrical and mechanical stresses. The current study aims to enhance the dielectric and mechanical properties of Polyvinyl Chloride (PVC), one of the wide used power cable insulation, by the insertion of chemically modified silica (silicon dioxid...
Conference Paper
The presence of impurities, voids or gas bubbles during the manufacturing process of insulating materials of power cables leads to electrical degradation in the form of partial discharges (PDs). This paper aims to enhance PD activity of low density polyethylene (LDPE) with the insertion of titanium dioxide (TiO2) nanoparticles through using the mel...
Article
The current study is to investigate the influence of inserting chemically modified titanium oxide (TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) nanoparticles on the dielectric and mechanical properties of the commercial compound Polyvinyl Chloride (PVC) used in insulating power cables....
Conference Paper
The tendency to enhance the dielectric properties of insulating materials used in cables has become necessary in order to design new insulation systems that can withstand higher voltage levels. The current study is to investigate the improvement in dielectric properties of Polyvinyl Chloride (PVC) due to the insertion of chemically functionalized t...
Conference Paper
This paper deals with the computations of the induced voltages on the gas pipeline that is buried in multi-layer soil near to Egyptian 500 kV power line. In this study, the effect of homogeneous and non-homogeneous soil resistivities on the calculated values of the induced voltage due to inductive coupling on buried gas pipeline under normal operat...
Article
In this paper the induced voltages along the length of the buried gas pipeline, due to the inductive coupling and conductive coupling between this pipeline and the overhead transmission line (OHTL), are calculated under normal and fault conditions of the OHTL. Also, this paper deals with the mitigation of these induced voltages. Fault conditions of...
Article
Ground level magnetic field from overhead transmission lines (OHTLs) is of increasingly important considerations in several research areas due to their harmful effect on human health and environment. This paper computes the ground level magnetic field, under normal and abnormal conditions of Egyptian 500-kV single circuit transmission line, in thre...
Article
Ground level magnetic field from overhead transmission lines (OHTLs) is of increasingly important considerations in several research areas due to their harmful effect on human health and environment. This paper computes the ground level magnetic field, under normal and abnormal conditions of Egyptian 500-kV single circuit transmission line, in thre...
Article
The increase of power demand has increased the need for transmitting huge amount of power over long dis- tances. Large transmission lines configurations with high voltage and current levels generate large values of electric and magnetic fields stresses which affect the humanbeing and the nearby objects located at ground surfaces. This has in turn p...
Article
Full-text available
Theoretical investigation of the onset voltage of negative corona on stranded conductors is described in this paper. The method of calculation is based on the criterion developed for the formation of repetitive negative corona Trichel pulses. This calls first for an accurate calculation of the electric field in the vicinity of stranded conductors....
Article
Full-text available
Theoretical investigation of the onset voltage of negative corona on stranded conductors is described in this paper. The method of calculation is based on the criterion developed for the formation of repetitive negative corona Trichel pulses. This calls at first for accurate calculation of the electric field in the vicinity of stranded conductors....
Article
Rigorous assessment of uncertainties associated with capacitor installation in distribution systems is the aim of the present paper. Interval mathematics provides a powerful tool for modeling uncertainties. To account for such uncertainties, a heuristic method coupled with interval mathematics is developed with the aim of maximizing a cost saving f...
Article
The paper presents the application of Interval Mathematics as a new method to, rigorously, address uncertainties associated with capacitor installation in distribution feeders. While several methods exist to determine optimal capacitor sizes and locations in distribution feeders, these methods usually require data which may be uncertain in nature....
Article
Full-text available
The exposure to power frequency magnetic fields including those resulting from electrical power substations is playing a vital role in the human biological study. This paper presents a thorough investigation into the evaluation of the internal induced electric fields and induced current densities that are induced inside the human body due to the ex...
Conference Paper
Full-text available
The electric utility planning process begins with the electric load forecasting, because of the advanced need for new utility plants. These long lead times require the utility planning horizon to be at least ten years long. Since utility decisions involve an economic analysis of the operating and investment costs, the utility planning horizon may r...
Article
The impact of tower staggering on the magnetic field distributions under parallel power lines is thoroughly investigated. The staggering techniques are classified into two types; artificial staggering applied at parallel lines with the same span length and natural staggering resulted from parallel lines with different span lengths. The lateral magn...
Article
This paper investigates the transient performance of cable systems under energisation conditions, including the non-linear effects of surge divertors which are used as sheath voltage limiters. The method of solution developed and used is based on the modified Fourier transform technique in conjunction with model analysis. The non-linear effects of...
Article
The present study is concerned with investigation of the problem of determining transient overvoltages in cross-bonded cable systems. It improves the efficiency of computation by determining short-cut methods and by organizing the inverse Fourier transform in a more efficient manner. Also, the effect of assuming zero earthing resistances at the maj...
Article
The investigation of this study is concerned with the effects of single-phase induction motors in the electrical power system when a fault occurs. The study is involved with both experimental and analytical investigations. Single-phase induction motors do contribute during short circuits. The most important quantity is the instantaneous peak curren...
Article
A gas insulated substation can be subjected to a high amplitude of overvoltages as a result of lightning strokes striking the substation. This can cause a back flashover failure, which will damage the equipment and devices in the substation if these overvoltages are allowed to exceed those that the devices can withstand. In this study, an investiga...
Article
A back flashover for a shielding failure can be caused by a lightning stroke, which will damage equipment and devices in a gas insulated substation if the devices' maximum voltages are exceeded.In this study, the branch timetable method, which is implemented from the lattice diagram method, is used in a computer program for the calculation of overv...
Article
Full-text available
In this paper, the transmission line tower response and behaviour are described when a lightning stroke terminates on the tower apex. The accompanied overvoltages on different points on the tower and under different conditions are covered. The effect of tower representation and modelling on the overvoltages produced and the tower travel time is als...
Article
This paper describes the behaviour of transmission line towers when a lightning stroke terminates on the ground wire. The accompaning overvoltages on different points on the tower and under different conditions are covered. The effect of tower modelling on the overvoltages produced and the tower travel time is also included.
Article
This paper outlines some of the restrictions which currently exist in the generation data of the IEEE Reliability Test System (RTS). The paper extends the RTS by including more factors and system conditions which may be included in the reliability evaluation of generating systems. These extensions create a wider set of consistent data. The paper al...

Network

Cited By