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Ajouter le résultat dans votre panierPromoting condition monitoring and diagnostics of electrical insulation in undergraduate capstone graduation projects / El-Hag, Ayman H. in IEEE electrical insulation magazine, Vol. 31 N° 5 (Septembre/Octobre 2015)
Titre : Promoting condition monitoring and diagnostics of electrical insulation in undergraduate capstone graduation projects Type de document : texte imprimé Auteurs : El-Hag, Ayman H., Auteur Année de publication : 2015 Article en page(s) : pp. 8-15 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Condition monitoring Further education Insulation Power engineering Résumé : High-voltage engineering is not usually an appealing area to undergraduate students because it is commonly perceived as a classical area of electrical engineering. Moreover, high-voltage (HV) engineering requires an HV laboratory, which is not usually available in universities because of high cost. In addition, several universities that already had HV laboratories decided to close them and use the space for more cutting-edge technology. Consequently, most of the researchers who did their PhDs in HV engineering were forced to switch their research work to different areas or concentrate on simulation-based research projects. This resulted in fewer students being attracted to HV engineering at both undergraduate and graduate levels. In this article four capstone graduation projects presented at the American University of Sharjah in the last nine years are discussed, each related to condition monitoring and diagnostics of electrical insulation. They required minimum HV infrastructure and, hence, could be implemented at modest cost. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214440&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 8-15[article] Promoting condition monitoring and diagnostics of electrical insulation in undergraduate capstone graduation projects [texte imprimé] / El-Hag, Ayman H., Auteur . - 2015 . - pp. 8-15.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 8-15
Mots-clés : Condition monitoring Further education Insulation Power engineering Résumé : High-voltage engineering is not usually an appealing area to undergraduate students because it is commonly perceived as a classical area of electrical engineering. Moreover, high-voltage (HV) engineering requires an HV laboratory, which is not usually available in universities because of high cost. In addition, several universities that already had HV laboratories decided to close them and use the space for more cutting-edge technology. Consequently, most of the researchers who did their PhDs in HV engineering were forced to switch their research work to different areas or concentrate on simulation-based research projects. This resulted in fewer students being attracted to HV engineering at both undergraduate and graduate levels. In this article four capstone graduation projects presented at the American University of Sharjah in the last nine years are discussed, each related to condition monitoring and diagnostics of electrical insulation. They required minimum HV infrastructure and, hence, could be implemented at modest cost. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214440&filter%3DAND% [...] Exemplaires
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Titre : Using the inclined-plane test to evaluate the resistance of outdoor polymer insulating materials to electrical tracking and erosion Type de document : texte imprimé Auteurs : Ghunem, Refat Atef, Auteur Année de publication : 2015 Article en page(s) : pp. 16 - 22 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Composite insulators Insulator contamination testing Wear resistance Résumé : Evaluating the electrical tracking and erosion resistance of polymeric housing materials is an essential task performed in the development of outdoor insulators. “Tracking” means the formation of a surface carbonaceous path, and “erosion” means weight loss of the housing material. An absolute measurement of the tracking and erosion resistance is not possible; only relative ranking of composites can be achieved using the standard tracking and erosion tests. During the early use of organic insulating materials, failure due to tracking was a major concern, and therefore standard screening methods were proposed to evaluate the tracking rather than the erosion resistance. Erosion has become more important following the development of tracking resistant composites containing high levels of inorganic fillers. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214441&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 16 - 22[article] Using the inclined-plane test to evaluate the resistance of outdoor polymer insulating materials to electrical tracking and erosion [texte imprimé] / Ghunem, Refat Atef, Auteur . - 2015 . - pp. 16 - 22.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 16 - 22
Mots-clés : Composite insulators Insulator contamination testing Wear resistance Résumé : Evaluating the electrical tracking and erosion resistance of polymeric housing materials is an essential task performed in the development of outdoor insulators. “Tracking” means the formation of a surface carbonaceous path, and “erosion” means weight loss of the housing material. An absolute measurement of the tracking and erosion resistance is not possible; only relative ranking of composites can be achieved using the standard tracking and erosion tests. During the early use of organic insulating materials, failure due to tracking was a major concern, and therefore standard screening methods were proposed to evaluate the tracking rather than the erosion resistance. Erosion has become more important following the development of tracking resistant composites containing high levels of inorganic fillers. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214441&filter%3DAND% [...] Exemplaires
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Titre : Determining water in transformer paper insulation: analyzing aging transformers Type de document : texte imprimé Auteurs : Martin, Daniel, Auteur ; Saha, Tapan, Auteur ; Dee, Richard, Auteur Année de publication : 2015 Article en page(s) : pp. 23 - 32 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Condition monitoring Insulation Paper insulation Transformer Résumé : It is important to monitor the water concentration in the insulation of aging power transformers, because over time the insulation becomes wet, due to water ingress from the atmosphere and water formed in chemical reactions involving oxygen. If the water concentration is sufficiently high, the insulation will age prematurely [1] and the transformer may fail if overloaded [2]. In a previous article [3] we reported on the measurement of water concentration in the insulation paper of a power transformer that had been in service for only seven years. The water-concentration data obtained using on-line water-activity probes were compared with corresponding data obtained from dielectric response measurements. In that work cellulose adsorption isotherms were used to process the water-activity-probe data. However, according to [4] and [5], inaccuracies in the water-concentration estimates may result from the use of adsorption isotherms. According to [6], these inaccuracies may exceed 200%. The probable main causes are the transformer insulation materials not reaching thermal equilibrium, the water concentration within the insulation not being uniform, and variability in the properties of the insulating materials. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214442&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 23 - 32[article] Determining water in transformer paper insulation: analyzing aging transformers [texte imprimé] / Martin, Daniel, Auteur ; Saha, Tapan, Auteur ; Dee, Richard, Auteur . - 2015 . - pp. 23 - 32.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 23 - 32
Mots-clés : Condition monitoring Insulation Paper insulation Transformer Résumé : It is important to monitor the water concentration in the insulation of aging power transformers, because over time the insulation becomes wet, due to water ingress from the atmosphere and water formed in chemical reactions involving oxygen. If the water concentration is sufficiently high, the insulation will age prematurely [1] and the transformer may fail if overloaded [2]. In a previous article [3] we reported on the measurement of water concentration in the insulation paper of a power transformer that had been in service for only seven years. The water-concentration data obtained using on-line water-activity probes were compared with corresponding data obtained from dielectric response measurements. In that work cellulose adsorption isotherms were used to process the water-activity-probe data. However, according to [4] and [5], inaccuracies in the water-concentration estimates may result from the use of adsorption isotherms. According to [6], these inaccuracies may exceed 200%. The probable main causes are the transformer insulation materials not reaching thermal equilibrium, the water concentration within the insulation not being uniform, and variability in the properties of the insulating materials. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214442&filter%3DAND% [...] Exemplaires
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Titre : Life-data analysis for condition assessment of high-voltage assets Type de document : texte imprimé Auteurs : Chmura, Lukasz, Auteur ; Morshuis, Peter H. F., Auteur ; Smit, Johan J., Auteur Année de publication : 2015 Article en page(s) : pp. 33 - 43 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Aging assessment Epoxy resin bushing Life cycle Nonhomogeneous data Statistics Tap changer Résumé : Currently, network operators are facing a situation in which their high-voltage assets are reaching or even exceeding their design lifetimes [1]-[3]. The problem of future replacement of assets must thus be considered [4], [5]. Spare parts must be available to ensure replacement of components that fail during operation. In practice, utilities adopt two different approaches to assessing the condition of their assets [6], [7], namely bottom-up and top-down analysis. Bottom-up analysis uses aging characteristics of the materials within a given asset, and diagnostic measurements are performed to assess the physical degradation of the various parts of that asset. In contrast, top-down analysis uses mathematics to analyze the service-lifetime data of the whole population under consideration and to estimate the number of future failures within the population. In practice, both approaches have limitations due to differences in component design, operational conditions, environment, and maintenance programs [1]. An additional difficulty arises from ongoing technological improvements, e.g., in the properties of materials used in high-voltage components over a period of perhaps 40 years. In this paper, parametric statistical methods are used to analyze the time to failure of high-voltage components and to estimate the number of future failures. Attention is drawn to several problems that complicate the statistical analysis of service-lifetime data. Detailed information on the basic theory of statistical analysis of failure data can be found in [5], [6], [8]. Using service-lifetime data provided by a Dutch utility, and Monte Carlo simulations, three case studies of the failure of high-voltage components are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214443&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 33 - 43[article] Life-data analysis for condition assessment of high-voltage assets [texte imprimé] / Chmura, Lukasz, Auteur ; Morshuis, Peter H. F., Auteur ; Smit, Johan J., Auteur . - 2015 . - pp. 33 - 43.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 33 - 43
Mots-clés : Aging assessment Epoxy resin bushing Life cycle Nonhomogeneous data Statistics Tap changer Résumé : Currently, network operators are facing a situation in which their high-voltage assets are reaching or even exceeding their design lifetimes [1]-[3]. The problem of future replacement of assets must thus be considered [4], [5]. Spare parts must be available to ensure replacement of components that fail during operation. In practice, utilities adopt two different approaches to assessing the condition of their assets [6], [7], namely bottom-up and top-down analysis. Bottom-up analysis uses aging characteristics of the materials within a given asset, and diagnostic measurements are performed to assess the physical degradation of the various parts of that asset. In contrast, top-down analysis uses mathematics to analyze the service-lifetime data of the whole population under consideration and to estimate the number of future failures within the population. In practice, both approaches have limitations due to differences in component design, operational conditions, environment, and maintenance programs [1]. An additional difficulty arises from ongoing technological improvements, e.g., in the properties of materials used in high-voltage components over a period of perhaps 40 years. In this paper, parametric statistical methods are used to analyze the time to failure of high-voltage components and to estimate the number of future failures. Attention is drawn to several problems that complicate the statistical analysis of service-lifetime data. Detailed information on the basic theory of statistical analysis of failure data can be found in [5], [6], [8]. Using service-lifetime data provided by a Dutch utility, and Monte Carlo simulations, three case studies of the failure of high-voltage components are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214443&filter%3DAND% [...] Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Life-data analysis for condition assessment of high-voltage assets Type de document : texte imprimé Auteurs : Chmura, Lukasz, Auteur ; Morshuis, Peter H. F., Auteur ; Smit, Johan J., Auteur Année de publication : 2015 Article en page(s) : pp. 33 - 43 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Aging assessment Epoxy resin bushing Life cycle Nonhomogeneous data Statistics Tap changer Résumé : Currently, network operators are facing a situation in which their high-voltage assets are reaching or even exceeding their design lifetimes [1]-[3]. The problem of future replacement of assets must thus be considered [4], [5]. Spare parts must be available to ensure replacement of components that fail during operation. In practice, utilities adopt two different approaches to assessing the condition of their assets [6], [7], namely bottom-up and top-down analysis. Bottom-up analysis uses aging characteristics of the materials within a given asset, and diagnostic measurements are performed to assess the physical degradation of the various parts of that asset. In contrast, top-down analysis uses mathematics to analyze the service-lifetime data of the whole population under consideration and to estimate the number of future failures within the population. In practice, both approaches have limitations due to differences in component design, operational conditions, environment, and maintenance programs [1]. An additional difficulty arises from ongoing technological improvements, e.g., in the properties of materials used in high-voltage components over a period of perhaps 40 years. In this paper, parametric statistical methods are used to analyze the time to failure of high-voltage components and to estimate the number of future failures. Attention is drawn to several problems that complicate the statistical analysis of service-lifetime data. Detailed information on the basic theory of statistical analysis of failure data can be found in [5], [6], [8]. Using service-lifetime data provided by a Dutch utility, and Monte Carlo simulations, three case studies of the failure of high-voltage components are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214443&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 33 - 43[article] Life-data analysis for condition assessment of high-voltage assets [texte imprimé] / Chmura, Lukasz, Auteur ; Morshuis, Peter H. F., Auteur ; Smit, Johan J., Auteur . - 2015 . - pp. 33 - 43.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 31 N° 5 (Septembre/Octobre 2015) . - pp. 33 - 43
Mots-clés : Aging assessment Epoxy resin bushing Life cycle Nonhomogeneous data Statistics Tap changer Résumé : Currently, network operators are facing a situation in which their high-voltage assets are reaching or even exceeding their design lifetimes [1]-[3]. The problem of future replacement of assets must thus be considered [4], [5]. Spare parts must be available to ensure replacement of components that fail during operation. In practice, utilities adopt two different approaches to assessing the condition of their assets [6], [7], namely bottom-up and top-down analysis. Bottom-up analysis uses aging characteristics of the materials within a given asset, and diagnostic measurements are performed to assess the physical degradation of the various parts of that asset. In contrast, top-down analysis uses mathematics to analyze the service-lifetime data of the whole population under consideration and to estimate the number of future failures within the population. In practice, both approaches have limitations due to differences in component design, operational conditions, environment, and maintenance programs [1]. An additional difficulty arises from ongoing technological improvements, e.g., in the properties of materials used in high-voltage components over a period of perhaps 40 years. In this paper, parametric statistical methods are used to analyze the time to failure of high-voltage components and to estimate the number of future failures. Attention is drawn to several problems that complicate the statistical analysis of service-lifetime data. Detailed information on the basic theory of statistical analysis of failure data can be found in [5], [6], [8]. Using service-lifetime data provided by a Dutch utility, and Monte Carlo simulations, three case studies of the failure of high-voltage components are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7214443&filter%3DAND% [...] Exemplaires
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