The Experts below are selected from a list of 120 Experts worldwide ranked by ideXlab platform
Dyhia Doufene - One of the best experts on this subject based on the ideXlab platform.
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Shape and electric performance improvement of an Insulator string using particles swarm algorithm
IET Science Measurement & Technology, 2020Co-Authors: Dyhia Doufene, Slimane Bouazabia, Abderrahmane HaddadAbstract:In this study, a particle swarm optimisation (PSO) algorithm coupled with finite-element method (FEM) is implemented to improve the performance of a cap-and-Pin Insulator by reducing the value of maximum electric field strength. Two goals are set in this work: (i) optimisation of the tangential electric field distribution and magnitude (which is taken as the objectif function to be minimised) to reduce the risk of flashover due to surface pollution, and (ii) reduction of the creepage distance (by adopting adequate constraints) leading to a reduction of the surface area and consequently a decrease in the Insulator weight. The investigation is divided into two parts; first, one-unit Insulator is optimised with which a chain is constructed, and its performance compared with the reference Insulator string. The second part considers a whole chain of four-unit Insulator whose performance is optimised and compared to that of a reference Insulator string. The main finding of this work indicates that, if an Insulator string is constructed using an optimised cap-and-Pin unit, the performance of the so-formed string is also optimised. The optimisation of a complete string leads to practically the same performance as that of a string obtained by assembling optimised Insulator units.
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optimised performance of cap and Pin Insulator under wet pollution conditions using a mono objective genetic algorithm
Australian journal of electrical and electronics engineering, 2019Co-Authors: Dyhia Doufene, Slimane Bouazabia, A HaddadAbstract:ABSTRACTExtensive research was carried out on the relation between pollution performances of high voltage Insulators and their shape. However, very little work has been published using numerical op...
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Heating Dissipation Study of a Pollution Layer on a Cap and Pin Insulator
2018 International Conference on Communications and Electrical Engineering (ICCEE), 2018Co-Authors: Dyhia Doufene, Slimane Bouazabia, Rafik BouhaddicheAbstract:The flashover mechanism of outdoor Insulators is stated in the literature, and follows several steps before occurring. Beginning by the wetting process; by rain or fog, of the pollution layer already deposited on the surface of the Insulator, allowing leakage current to flow and causing heating dissipation in the pollution layer, leading to dry bands formation, and after, to the arcing of the latter due to the voltage concentration around them. Subsequently the flashover of the whole Insulator occurs by the ionization of the arc path. In this paper, one of the flashover mechanisms is studied, namely the heat dissipation, due to the leakage current flow in a pollution layer deposited on a high voltage Insulator surface. To achieve this work COMSOL-Multiphysics computes the temperature distribution on the pollution layer, having different values of the electrical conductivity. The obtained results show that the temperature is highest at the Pin region where the electric field is most significant. Due to the non-regular shape of the cap and Pin Insulator there is peaks in the temperature repartition allowing dry band formation.
Biswendu Chatterjee - One of the best experts on this subject based on the ideXlab platform.
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Effect of humidity on leakage current of a contaminated 11 kV Porcelain Pin Insulator
2017 6th International Conference on Computer Applications In Electrical Engineering-Recent Advances (CERA), 2017Co-Authors: Riddhi Ghosh, Santu Dutta, Sovan Dalai, Biswendu ChatterjeeAbstract:Porcelain Pin Insulators are one of the most critical components of Power system transmission and distribution arena. Due to environmental degradations these Insulators get contaminated. Leakage current starts to flow over the surface of contaminated Insulators in presence of humidity, light rain, fog, mist etc. This phenomenon ultimately leads to flashover. To prevent flashover, leakage current measurement of contaminated Insulator is very essential. To measure leakage current of a contaminated Insulator in presence of humidity of different levels, an experimental set up has been arranged at High Voltage Laboratory of Jadavpur University. From leakage current data and FFT analysis, it will be very helpful for prediction of contamination level of Insulators and finally flashover will be averted.
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Condition monitoring of 11kV porcelain Pin Insulator extracting surface current from total leakage current
2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON), 2017Co-Authors: Riddhi Ghosh, Santu Dutta, Sovan Dalai, Biswendu ChatterjeeAbstract:Insulators are one of the most important components of the power system. Outdoor Insulators get contaminated easily due to various kinds of pollutants. Leakage current flows even when surface is dry though magnitude is very low but this leakage current gets strengthened due to increase in humidity, light rain, fog, mist etc. It ultimately leads towards flashover which is highly undesirable. Therefore, condition monitoring of power system Insulators is very much necessary. Leakage current monitoring is one of the prime techniques for Insulator monitoring. Leakage current consists of both volume current and surface current. Only surface current is affected by external causes like contamination and humidity. Therefore, surface current is a more accurate indicator for condition monitoring. Using harmonic analysis method surface current is extracted from total leakage current. Phase angle analysis at different humidity conditions has been carried out for both total leakage current and surface current. From above mentioned analysis, it may be observed that a significant difference in phase angle may be obtained when only surface current is considered instead of total leakage current. Therefore, this paper gives rise to the possibility of using only surface leakage current for more accurate condition monitoring of Insulator.
A. A. Ladjici - One of the best experts on this subject based on the ideXlab platform.
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Shape optimization of a cap and Pin Insulator in pollution condition using particle swarm and neural network
2017 5th International Conference on Electrical Engineering - Boumerdes (ICEE-B), 2017Co-Authors: D. Doufene, S. Bouazabia, A. A. LadjiciAbstract:The objective in this paper is the introduction of a new method in the design of high voltage Insulators by exploiting a meta-heuristic optimization. Indeed, a neural network is used for the prediction of the value of the tangential electric field at the high voltage Pin (the area where the value of the electric field is maximum), which will then serve as an objective function to be minimized by the particle swarms optimization method (PSO). Constraints are assigned to the model in order to reduce the creepage distance of the Insulator and consequently reduce its weight.
G. Grigordakis - One of the best experts on this subject based on the ideXlab platform.
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Leakage currents on lightly polluted 275 kV glass disc Insulator strings in conditions of light wetting
1999 IEEE Africon. 5th Africon Conference in Africa (Cat. No.99CH36342), 1999Co-Authors: F.f. Bologna, A.c. Britten, G. Watridge, D.j. Stevens, G. GrigordakisAbstract:The research described here forms part of a larger study into the underlying reasons for a significant number of unexplained flashovers on Eskom's 220, 275 and 400 kV lines. Deductions made so far suggest that the flashovers could be the result of the combined effects of light wetting, light pollution and condensation on glass Insulator strings. To evaluate this hypothesis further, leakage currents flowing on naturally polluted 275 kV glass cap and Pin Insulator strings (I and Vee) were monitored for about a year on a test tower in Highveld ambient conditions. The currents remained below 1 mA for most of the time, but were found at times to increase during periods when the relative humidity exceeded 75 to 80%. No flashovers occurred, but the leakage current patterns observed provide new insights into the possible mechanisms which could lead to flashover in low pollution, light wetting conditions.
Slimane Bouazabia - One of the best experts on this subject based on the ideXlab platform.
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Shape and electric performance improvement of an Insulator string using particles swarm algorithm
IET Science Measurement & Technology, 2020Co-Authors: Dyhia Doufene, Slimane Bouazabia, Abderrahmane HaddadAbstract:In this study, a particle swarm optimisation (PSO) algorithm coupled with finite-element method (FEM) is implemented to improve the performance of a cap-and-Pin Insulator by reducing the value of maximum electric field strength. Two goals are set in this work: (i) optimisation of the tangential electric field distribution and magnitude (which is taken as the objectif function to be minimised) to reduce the risk of flashover due to surface pollution, and (ii) reduction of the creepage distance (by adopting adequate constraints) leading to a reduction of the surface area and consequently a decrease in the Insulator weight. The investigation is divided into two parts; first, one-unit Insulator is optimised with which a chain is constructed, and its performance compared with the reference Insulator string. The second part considers a whole chain of four-unit Insulator whose performance is optimised and compared to that of a reference Insulator string. The main finding of this work indicates that, if an Insulator string is constructed using an optimised cap-and-Pin unit, the performance of the so-formed string is also optimised. The optimisation of a complete string leads to practically the same performance as that of a string obtained by assembling optimised Insulator units.
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optimised performance of cap and Pin Insulator under wet pollution conditions using a mono objective genetic algorithm
Australian journal of electrical and electronics engineering, 2019Co-Authors: Dyhia Doufene, Slimane Bouazabia, A HaddadAbstract:ABSTRACTExtensive research was carried out on the relation between pollution performances of high voltage Insulators and their shape. However, very little work has been published using numerical op...
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Heating Dissipation Study of a Pollution Layer on a Cap and Pin Insulator
2018 International Conference on Communications and Electrical Engineering (ICCEE), 2018Co-Authors: Dyhia Doufene, Slimane Bouazabia, Rafik BouhaddicheAbstract:The flashover mechanism of outdoor Insulators is stated in the literature, and follows several steps before occurring. Beginning by the wetting process; by rain or fog, of the pollution layer already deposited on the surface of the Insulator, allowing leakage current to flow and causing heating dissipation in the pollution layer, leading to dry bands formation, and after, to the arcing of the latter due to the voltage concentration around them. Subsequently the flashover of the whole Insulator occurs by the ionization of the arc path. In this paper, one of the flashover mechanisms is studied, namely the heat dissipation, due to the leakage current flow in a pollution layer deposited on a high voltage Insulator surface. To achieve this work COMSOL-Multiphysics computes the temperature distribution on the pollution layer, having different values of the electrical conductivity. The obtained results show that the temperature is highest at the Pin region where the electric field is most significant. Due to the non-regular shape of the cap and Pin Insulator there is peaks in the temperature repartition allowing dry band formation.