M. Teguar | Ecole Nationale Polytechnique d'Alger (original) (raw)
Papers by M. Teguar
2014 ICHVE International Conference on High Voltage Engineering and Application, 2014
In this paper, the Recurrent Plot (RP) method is used to monitor polluted insulator performance. ... more In this paper, the Recurrent Plot (RP) method is used to monitor polluted insulator performance. LC acquisition is first carried out on 1512L insulator model, under various lengths (5, 10, 15, 20 and 25 cm) of a polluted layer deposited at HV side. Next, the high frequency component of LC is extracted and reconstructed in an appropriate phase space. RP is then computed. For a polluted layer length up to 15 cm, RP diagram consists in dispersed low density recurrent points indicating the faint discharge activity and thus, the healthy insulator condition. However, for a polluted layer length more up to 15 cm, RP is composed of intense recurrent points and wide white bands. The dense recurrent points indicate the apparition of stronger discharges, while the white bands announce the presence of arcing discharges on the insulating surface. RP technique, based on LC frequency representation, provides an efficient and rapid analysis of the insulator condition. RP represents an excellent alternative to classical signal processing methods for polluted insulator performance monitoring.
IEEE Transactions on Dielectrics and Electrical Insulation, 2015
Insulator flashover under pollution is one of the most important problems for power transmission.... more Insulator flashover under pollution is one of the most important problems for power transmission. Occurrence of flashover is preceded by discharges propagation. This paper is dedicated to monitor discharges activity through arcing discharges pattern recognition using a combination of efficient image processing and classification algorithms. Images are extracted from recorded videos of flashover process over a plane model insulator under various contamination levels. Then, an algorithm is proposed and tested over a large image database. This algorithm processes in four stages. First, Otsu image segmentation algorithm is initially applied on images. Next, morphological filtering by combining erosion and dilation operations is computed to eliminate unwanted noises such as light reflections on the insulator model. Afterwards, connected components on filtered image are labelled enabling the calculations of four important morphological indicators consisting in the number of the connected labeled components ( ) and the number of pixels, the length and the width of the largest connected component region ( , L and W respectively). These indicators characterize different properties of discharges activity and are used as an input of three well know classification algorithms (Knn, Naïve Bayes, Support Vector Machines) to distinguish between the presence or not of arcing discharges on the insulator surface. This paper introduces image processing as an efficient and fast tool for discharges activity analysis and insulator flashover monitoring. The proposed methodology dispenses the heavy instrumentations and tedious processing of conventional laboratory tests.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
The objective of our study is to analyse the ac applied voltage signals recorded for different po... more The objective of our study is to analyse the ac applied voltage signals recorded for different pollution levels using a following technique: wavelet packet analysis. Laboratory tests were performed on flat plate models of glass (500x500x5 mm) under uniform pollution. The plate models were sprayed with a solution prepared by mixing 100 g of kaolin in one liter of distilled water. An appropriate amount of NaCl was added to the slurry to give required Equivalent Salt Deposit Density (ESDD). The various studied ESDD are as follows: 1.2, 3.5, 6, 10, 15 and 20 mS/cm. The obtained results show that this technique constitutes a very effective tool to estimate the pollution severity degree on outdoor insulation surface.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
Recently, the Algerian S ociety of electricity and gas (SONELGAZ), introduces a higher voltage le... more Recently, the Algerian S ociety of electricity and gas (SONELGAZ), introduces a higher voltage level into its electrical system to meet the increasing demand for the highest quality of service and security of supply. This paper deals with the distributions of the potential and the electric field inside and around I, II and V cap and pin insulators string in 400kV AC transmission lines. It is well known that such distributions are affected by many factors such as the influence of tower, voltage magnitude, corona ring, contamination and environmental conditions. In order to approach the ideal conditions where the voltage would be linearly distributed on the whole of insulators string, corona rings are added. The computer simulations are carried out by using the COMSOL Multiphysics 3.5 software. This program uses the finite element method to solve the partial differential equations that describe the field. The simulations are conducted for different corona ring parameters such as mounting height and diameter.
2012 IEEE International Energy Conference and Exhibition (ENERGYCON), 2012
This paper presents a work devoted to the impact study of the pollution severity on the energy le... more This paper presents a work devoted to the impact study of the pollution severity on the energy level dissipated on high voltage insulator. The experimental tests were carried out on a plane model (500x500x5 mm 3 ) simulating the standard insulator PSV 120 B. This one is largely used by the Algerian company of electricity and gas (SONELGAZ). The laboratory tests concern the measurement of the cumulative charge on the insulator model for various polluting solutions. These solutions are made up of distilled water, NaCl and kaolin. The pollution severity degree is obtained by varying the NaCl and kaolin concentrations in one liter of distilled water. The energy evaluation is based on the measured cumulative charge. The obtained results show that the dissipated energy on the insulator model is proportional to the severity degree of the pollution. However this energy decreases or is saturated for the extremely high severity degree.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
The aim of this study is to analyze the behavior of an insulating plan model. For this purpose, w... more The aim of this study is to analyze the behavior of an insulating plan model. For this purpose, we have interested to the variation of the flashover voltage and the leakage current according to the thickness and the relative permittivity (nature) of the dielectric.
IEEE Transactions on Dielectrics and Electrical Insulation, 2000
In this work, the electric discharges activity on non-uniformly polluted glass plane insulator mo... more In this work, the electric discharges activity on non-uniformly polluted glass plane insulator model is investigated for increasing applied voltage levels up to flashover. The effect of pollution severity was simulated using pollution solution containing various kaolin concentrations. The polluted sample has a strip that is dry and clean which is parallel to the electrodes planes. Configurations with various widths (2 to 14 cm) and locations of this dry clean strip were tested, and both the leakage current and the accumulated charge were examined. Further in-depth examination of the leakage current waveforms was carried out using a wavelet analysis approach. The Discrete Wavelet Transform (DWT) is adopted for the leakage current decomposition in several time-frequency bands. The STD-MRA (Standard Deviation-Multi Resolution Analysis) representation is employed to specify the Detail components (frequency components). It is shown that these can be used to detect the presence or absence of partial arcs activity over the dry clean strips. The reported results show that the simultaneous increase in the standard deviation of the Details components D8 and D10 indicates the presence of the partial arcs. However, the increase only in the standard deviation of the Detail component D10 indicates no discharge activity. Such approach may have some useful application when analyzing the leakage current on its own to monitor discharge activity on polluted surface. Further work is on-going to apply this approach to full outdoor insulators.
2014 IEEE PES T&D Conference and Exposition, 2014
In this work, a novel approach is established in order to investigate and monitor the performance... more In this work, a novel approach is established in order to investigate and monitor the performance of high voltage insulators. Since leakage current (LC) waveforms are intimately linked to pollution severity, it is primordial to study and investigate leakage current characteristics during the entire contamination process. In this paper, performance of a plane model insulator is studied through a number of laboratory tests under various levels of pollution contamination. LC waveforms are investigated through a nonlinear method called "Recurrence Quantification Analysis" (RQA). This method revealed successfully the non-linear characteristics of LC for identifying the dynamic behaviors on the insulator surface. Moreover, RQA indicators are found to be directly linked to the contamination severity. Thus, mean values of these indicators are computed and used as an input to three different classification algorithms (knearest neighbors, Naïve Bayes, Support Vector Machines) in order to classify contamination severity.
2014 ICHVE International Conference on High Voltage Engineering and Application, 2014
In this paper, the Recurrent Plot (RP) method is used to monitor polluted insulator performance. ... more In this paper, the Recurrent Plot (RP) method is used to monitor polluted insulator performance. LC acquisition is first carried out on 1512L insulator model, under various lengths (5, 10, 15, 20 and 25 cm) of a polluted layer deposited at HV side. Next, the high frequency component of LC is extracted and reconstructed in an appropriate phase space. RP is then computed. For a polluted layer length up to 15 cm, RP diagram consists in dispersed low density recurrent points indicating the faint discharge activity and thus, the healthy insulator condition. However, for a polluted layer length more up to 15 cm, RP is composed of intense recurrent points and wide white bands. The dense recurrent points indicate the apparition of stronger discharges, while the white bands announce the presence of arcing discharges on the insulating surface. RP technique, based on LC frequency representation, provides an efficient and rapid analysis of the insulator condition. RP represents an excellent alternative to classical signal processing methods for polluted insulator performance monitoring.
IEEE Transactions on Dielectrics and Electrical Insulation, 2015
Insulator flashover under pollution is one of the most important problems for power transmission.... more Insulator flashover under pollution is one of the most important problems for power transmission. Occurrence of flashover is preceded by discharges propagation. This paper is dedicated to monitor discharges activity through arcing discharges pattern recognition using a combination of efficient image processing and classification algorithms. Images are extracted from recorded videos of flashover process over a plane model insulator under various contamination levels. Then, an algorithm is proposed and tested over a large image database. This algorithm processes in four stages. First, Otsu image segmentation algorithm is initially applied on images. Next, morphological filtering by combining erosion and dilation operations is computed to eliminate unwanted noises such as light reflections on the insulator model. Afterwards, connected components on filtered image are labelled enabling the calculations of four important morphological indicators consisting in the number of the connected labeled components ( ) and the number of pixels, the length and the width of the largest connected component region ( , L and W respectively). These indicators characterize different properties of discharges activity and are used as an input of three well know classification algorithms (Knn, Naïve Bayes, Support Vector Machines) to distinguish between the presence or not of arcing discharges on the insulator surface. This paper introduces image processing as an efficient and fast tool for discharges activity analysis and insulator flashover monitoring. The proposed methodology dispenses the heavy instrumentations and tedious processing of conventional laboratory tests.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
The objective of our study is to analyse the ac applied voltage signals recorded for different po... more The objective of our study is to analyse the ac applied voltage signals recorded for different pollution levels using a following technique: wavelet packet analysis. Laboratory tests were performed on flat plate models of glass (500x500x5 mm) under uniform pollution. The plate models were sprayed with a solution prepared by mixing 100 g of kaolin in one liter of distilled water. An appropriate amount of NaCl was added to the slurry to give required Equivalent Salt Deposit Density (ESDD). The various studied ESDD are as follows: 1.2, 3.5, 6, 10, 15 and 20 mS/cm. The obtained results show that this technique constitutes a very effective tool to estimate the pollution severity degree on outdoor insulation surface.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
Recently, the Algerian S ociety of electricity and gas (SONELGAZ), introduces a higher voltage le... more Recently, the Algerian S ociety of electricity and gas (SONELGAZ), introduces a higher voltage level into its electrical system to meet the increasing demand for the highest quality of service and security of supply. This paper deals with the distributions of the potential and the electric field inside and around I, II and V cap and pin insulators string in 400kV AC transmission lines. It is well known that such distributions are affected by many factors such as the influence of tower, voltage magnitude, corona ring, contamination and environmental conditions. In order to approach the ideal conditions where the voltage would be linearly distributed on the whole of insulators string, corona rings are added. The computer simulations are carried out by using the COMSOL Multiphysics 3.5 software. This program uses the finite element method to solve the partial differential equations that describe the field. The simulations are conducted for different corona ring parameters such as mounting height and diameter.
2012 IEEE International Energy Conference and Exhibition (ENERGYCON), 2012
This paper presents a work devoted to the impact study of the pollution severity on the energy le... more This paper presents a work devoted to the impact study of the pollution severity on the energy level dissipated on high voltage insulator. The experimental tests were carried out on a plane model (500x500x5 mm 3 ) simulating the standard insulator PSV 120 B. This one is largely used by the Algerian company of electricity and gas (SONELGAZ). The laboratory tests concern the measurement of the cumulative charge on the insulator model for various polluting solutions. These solutions are made up of distilled water, NaCl and kaolin. The pollution severity degree is obtained by varying the NaCl and kaolin concentrations in one liter of distilled water. The energy evaluation is based on the measured cumulative charge. The obtained results show that the dissipated energy on the insulator model is proportional to the severity degree of the pollution. However this energy decreases or is saturated for the extremely high severity degree.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
The aim of this study is to analyze the behavior of an insulating plan model. For this purpose, w... more The aim of this study is to analyze the behavior of an insulating plan model. For this purpose, we have interested to the variation of the flashover voltage and the leakage current according to the thickness and the relative permittivity (nature) of the dielectric.
IEEE Transactions on Dielectrics and Electrical Insulation, 2000
In this work, the electric discharges activity on non-uniformly polluted glass plane insulator mo... more In this work, the electric discharges activity on non-uniformly polluted glass plane insulator model is investigated for increasing applied voltage levels up to flashover. The effect of pollution severity was simulated using pollution solution containing various kaolin concentrations. The polluted sample has a strip that is dry and clean which is parallel to the electrodes planes. Configurations with various widths (2 to 14 cm) and locations of this dry clean strip were tested, and both the leakage current and the accumulated charge were examined. Further in-depth examination of the leakage current waveforms was carried out using a wavelet analysis approach. The Discrete Wavelet Transform (DWT) is adopted for the leakage current decomposition in several time-frequency bands. The STD-MRA (Standard Deviation-Multi Resolution Analysis) representation is employed to specify the Detail components (frequency components). It is shown that these can be used to detect the presence or absence of partial arcs activity over the dry clean strips. The reported results show that the simultaneous increase in the standard deviation of the Details components D8 and D10 indicates the presence of the partial arcs. However, the increase only in the standard deviation of the Detail component D10 indicates no discharge activity. Such approach may have some useful application when analyzing the leakage current on its own to monitor discharge activity on polluted surface. Further work is on-going to apply this approach to full outdoor insulators.
2014 IEEE PES T&D Conference and Exposition, 2014
In this work, a novel approach is established in order to investigate and monitor the performance... more In this work, a novel approach is established in order to investigate and monitor the performance of high voltage insulators. Since leakage current (LC) waveforms are intimately linked to pollution severity, it is primordial to study and investigate leakage current characteristics during the entire contamination process. In this paper, performance of a plane model insulator is studied through a number of laboratory tests under various levels of pollution contamination. LC waveforms are investigated through a nonlinear method called "Recurrence Quantification Analysis" (RQA). This method revealed successfully the non-linear characteristics of LC for identifying the dynamic behaviors on the insulator surface. Moreover, RQA indicators are found to be directly linked to the contamination severity. Thus, mean values of these indicators are computed and used as an input to three different classification algorithms (knearest neighbors, Naïve Bayes, Support Vector Machines) in order to classify contamination severity.