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Ajouter le résultat dans votre panierA novel method of wind energy generation-the electrostatic wind energy converter / Djairam, D. in IEEE electrical insulation magazine, Vol. 30 N° 4 (Juillet-Août 2014)
Titre : A novel method of wind energy generation-the electrostatic wind energy converter Type de document : texte imprimé Auteurs : Djairam, D., Auteur ; Morshuis, P. H. F., Auteur ; Smit, J. J., Auteur Année de publication : 2015 Article en page(s) : pp. 8 - 20 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Electrostatic generators Wind power plants Résumé : Since ancient times humanity has been harnessing the power of the wind in various forms, such as discovering the planet in sailboats, creating living space in the Dutch polders, or providing bread by flour-grinding windmills. Since 1887 wind has also been used to generate electricity as the shift to renewable energy production is being made [1]. In order to fulfill the long-term carbon emission goals set by, for example, the EU for 2050, the share of renewable energy (wind, solar, hydro, biofuels) needs to increase substantially [2]. Of these various means of renewable energy, wind energy is still the largest part. Therefore, wind farms, both decentralized and bulk, are being constructed. In 2010 wind energy constituted 2.5% of the global electricity production [3]. The article explores a novel method of wind energy generation using an electrostatic wind energy converter or EWICON. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843763&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 8 - 20[article] A novel method of wind energy generation-the electrostatic wind energy converter [texte imprimé] / Djairam, D., Auteur ; Morshuis, P. H. F., Auteur ; Smit, J. J., Auteur . - 2015 . - pp. 8 - 20.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 8 - 20
Mots-clés : Electrostatic generators Wind power plants Résumé : Since ancient times humanity has been harnessing the power of the wind in various forms, such as discovering the planet in sailboats, creating living space in the Dutch polders, or providing bread by flour-grinding windmills. Since 1887 wind has also been used to generate electricity as the shift to renewable energy production is being made [1]. In order to fulfill the long-term carbon emission goals set by, for example, the EU for 2050, the share of renewable energy (wind, solar, hydro, biofuels) needs to increase substantially [2]. Of these various means of renewable energy, wind energy is still the largest part. Therefore, wind farms, both decentralized and bulk, are being constructed. In 2010 wind energy constituted 2.5% of the global electricity production [3]. The article explores a novel method of wind energy generation using an electrostatic wind energy converter or EWICON. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843763&filter%3DAND% [...] Exemplaires
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Titre : Fractal analysis of nano-reinforced silicone rubber insulators evaluated on a tracking wheel Type de document : texte imprimé Auteurs : Ramirez-Vazquez, I., Auteur ; Ruiz-Pinales, J., Auteur ; Salgado-Talavera, J., Auteur Année de publication : 2015 Article en page(s) : pp. 21 - 27 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Erosion Fractals Leakage currents Polymer insulatorsRubber Résumé : The increased use of polymer insulators on the overhead electrical power system has led to many designs of insulators, with many profiles and materials, but the performance has not always been stellar, particularly in polluted and wet environments, and degradation by tracking and/or erosion has been the main reason for this. In tests, such as the tracking wheel, visual inspection of tracking and erosion is subjective and can be misleading in establishing a quantitative measure of the damage to insulators. In this article fractal analysis is used to analyze the leakage current that develops on polymer insulators when subjected to pollution and electrical stress. Leakage current manifests itself by dry-band arcing leading to erosion and possible tracking of the polymeric material. Leakage current obtained from continuous monitoring of insulators under test is subjected to a methodology based on fractal analysis. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843764&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 21 - 27[article] Fractal analysis of nano-reinforced silicone rubber insulators evaluated on a tracking wheel [texte imprimé] / Ramirez-Vazquez, I., Auteur ; Ruiz-Pinales, J., Auteur ; Salgado-Talavera, J., Auteur . - 2015 . - pp. 21 - 27.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 21 - 27
Mots-clés : Erosion Fractals Leakage currents Polymer insulatorsRubber Résumé : The increased use of polymer insulators on the overhead electrical power system has led to many designs of insulators, with many profiles and materials, but the performance has not always been stellar, particularly in polluted and wet environments, and degradation by tracking and/or erosion has been the main reason for this. In tests, such as the tracking wheel, visual inspection of tracking and erosion is subjective and can be misleading in establishing a quantitative measure of the damage to insulators. In this article fractal analysis is used to analyze the leakage current that develops on polymer insulators when subjected to pollution and electrical stress. Leakage current manifests itself by dry-band arcing leading to erosion and possible tracking of the polymeric material. Leakage current obtained from continuous monitoring of insulators under test is subjected to a methodology based on fractal analysis. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843764&filter%3DAND% [...] Exemplaires
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Titre : Experimental study of the thermal stability of irgamet 39 and dibenzyl disulfide in the laboratory and in transformers in service Type de document : texte imprimé Auteurs : Martins, M., Auteur Année de publication : 2015 Article en page(s) : pp. 28 - 33 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Passivation Power transformer insulation Thermal stability Transformer oil Résumé : In recent years, several documented cases of transformer failures have been attributed to the presence of corrosive sulfur species in the insulating oil [1], [2]. However, all sources of corrosive sulfur in oil have not been completely identified, yet. They can be residuals from the refining process, or they are formed under favorable operating conditions, such as high ambient and operating temperature and low oxygen concentration. It has been recently shown that noncorrosive sulfur compounds can become corrosive in oil with dissolved oxygen in the range of a few hundreds to a few thousands of parts per million, producing, for example, metal sulfides, after being exposed to high temperatures, electrical stresses, transient phenomena, DC fields, and hot metal surfaces. This has been quite commonly found in closed-type transformers (rubber bag or nitrogen blanketed) but can also occur in open breathing transformers, that work under more-or-less constant load, and in this case they breath very little [1], [3]. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843765&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 28 - 33[article] Experimental study of the thermal stability of irgamet 39 and dibenzyl disulfide in the laboratory and in transformers in service [texte imprimé] / Martins, M., Auteur . - 2015 . - pp. 28 - 33.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 28 - 33
Mots-clés : Passivation Power transformer insulation Thermal stability Transformer oil Résumé : In recent years, several documented cases of transformer failures have been attributed to the presence of corrosive sulfur species in the insulating oil [1], [2]. However, all sources of corrosive sulfur in oil have not been completely identified, yet. They can be residuals from the refining process, or they are formed under favorable operating conditions, such as high ambient and operating temperature and low oxygen concentration. It has been recently shown that noncorrosive sulfur compounds can become corrosive in oil with dissolved oxygen in the range of a few hundreds to a few thousands of parts per million, producing, for example, metal sulfides, after being exposed to high temperatures, electrical stresses, transient phenomena, DC fields, and hot metal surfaces. This has been quite commonly found in closed-type transformers (rubber bag or nitrogen blanketed) but can also occur in open breathing transformers, that work under more-or-less constant load, and in this case they breath very little [1], [3]. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843765&filter%3DAND% [...] Exemplaires
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Titre : Computer simulation as an aid in the rating of a transformer on-load tap changer Type de document : texte imprimé Auteurs : Pasquotto de Lima, P. A., Auteur ; Lopes Cabral, S. H., Auteur Année de publication : 2015 Article en page(s) : pp. 34 - 38 Note générale : Génie électrique Langues : Français (fre) Mots-clés : Arresters Capacitance Inductance Lightning protection Overvoltage Power transformer insulation Shielding Transformer windings Résumé : The on-load tap changer (OLTC) is a crucial and expensive component of every power transformer. Its primary function is the dynamic adjustment of load voltage to specified levels without interrupting load current. Apart from thermal limitations at each tap position, the main concern in correctly rating an OLTC is the basic impulse insulation level (BIL). The reason for this is that during the standard BIL test on a power transformer, damaging overvoltage may develop on the regulating winding, which is transferred to the OLTC, which may damage the OLTC, and as a result, fail the BIL test on the power transformer. In regard to the lightning impulse voltage test, since the overvoltage that develops is a consequence of the distributed capacitance and inductance of the regulating winding, and as there are several types of regulating windings, each with different values of distributed capacitance and inductance, the correct rating of the OLTC will depend on the type of regulating winding used. Therefore, the transformer designer must be able to estimate the transferred impulse overvoltage, for the purpose of not only choosing the right type of regulating winding, but also to limit the overvoltage through passive or active means, for example incorporating electrostatic shielding in the regulating winding or installing a MOV surge arrestor. With this aim, computational tools are a powerful aid for assisting the transformer designer, since they allow the computation of distributed capacitance and inductance of the regulating winding, as well as estimating the distributed impulsive voltage. On the other hand, in regard to voltage withstand at power frequency, the induced AC voltage test is also important for determining the BIL of an OLTC. This article presents a practical case as to the steps that must be taken by a transformer designer in rating a power transformer OLTC. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843766&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 34 - 38[article] Computer simulation as an aid in the rating of a transformer on-load tap changer [texte imprimé] / Pasquotto de Lima, P. A., Auteur ; Lopes Cabral, S. H., Auteur . - 2015 . - pp. 34 - 38.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 34 - 38
Mots-clés : Arresters Capacitance Inductance Lightning protection Overvoltage Power transformer insulation Shielding Transformer windings Résumé : The on-load tap changer (OLTC) is a crucial and expensive component of every power transformer. Its primary function is the dynamic adjustment of load voltage to specified levels without interrupting load current. Apart from thermal limitations at each tap position, the main concern in correctly rating an OLTC is the basic impulse insulation level (BIL). The reason for this is that during the standard BIL test on a power transformer, damaging overvoltage may develop on the regulating winding, which is transferred to the OLTC, which may damage the OLTC, and as a result, fail the BIL test on the power transformer. In regard to the lightning impulse voltage test, since the overvoltage that develops is a consequence of the distributed capacitance and inductance of the regulating winding, and as there are several types of regulating windings, each with different values of distributed capacitance and inductance, the correct rating of the OLTC will depend on the type of regulating winding used. Therefore, the transformer designer must be able to estimate the transferred impulse overvoltage, for the purpose of not only choosing the right type of regulating winding, but also to limit the overvoltage through passive or active means, for example incorporating electrostatic shielding in the regulating winding or installing a MOV surge arrestor. With this aim, computational tools are a powerful aid for assisting the transformer designer, since they allow the computation of distributed capacitance and inductance of the regulating winding, as well as estimating the distributed impulsive voltage. On the other hand, in regard to voltage withstand at power frequency, the induced AC voltage test is also important for determining the BIL of an OLTC. This article presents a practical case as to the steps that must be taken by a transformer designer in rating a power transformer OLTC. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843766&filter%3DAND% [...] Exemplaires
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Titre : The hidden threat to HVDC polymeric insulation at design field: Solitonic conduction Type de document : texte imprimé Auteurs : Montanari, G. C., Auteur ; Dissado, L. A., Auteur ; Serra, S., Auteur Année de publication : 2015 Article en page(s) : pp. 39 - 50 Note générale : Génie électrique Langues : Français (fre) Mots-clés : HVDC power transmission Polyethylene insulation Reliability Space charge Thermal stability Résumé : While HVDC assets are impetuously expanding worldwide, the design of HVDC polymeric insulation systems still contains unknowns. It has been ascertained that space charge plays a fundamental role in DC insulation reliability because of modifications it may induce in the (Poissonian) electric field distribution, especially when heterocharge is formed during voltage application. Heterocharge (charge close to an electrode of opposite polarity to that of the electrode) can increase the electric field at the interface between electrode and polymer, thereby enhancing injection from the electrode. This can cause so large a field concentration as to increase the conductivity abruptly and lead to insulation failure due to the electrical discharge process called, usually, thermal instability breakdown [1], [2]. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843767&filter%3DAND% [...]
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 39 - 50[article] The hidden threat to HVDC polymeric insulation at design field: Solitonic conduction [texte imprimé] / Montanari, G. C., Auteur ; Dissado, L. A., Auteur ; Serra, S., Auteur . - 2015 . - pp. 39 - 50.
Génie électrique
Langues : Français (fre)
in IEEE electrical insulation magazine > Vol. 30 N° 4 (Juillet-Août 2014) . - pp. 39 - 50
Mots-clés : HVDC power transmission Polyethylene insulation Reliability Space charge Thermal stability Résumé : While HVDC assets are impetuously expanding worldwide, the design of HVDC polymeric insulation systems still contains unknowns. It has been ascertained that space charge plays a fundamental role in DC insulation reliability because of modifications it may induce in the (Poissonian) electric field distribution, especially when heterocharge is formed during voltage application. Heterocharge (charge close to an electrode of opposite polarity to that of the electrode) can increase the electric field at the interface between electrode and polymer, thereby enhancing injection from the electrode. This can cause so large a field concentration as to increase the conductivity abruptly and lead to insulation failure due to the electrical discharge process called, usually, thermal instability breakdown [1], [2]. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6843767&filter%3DAND% [...] Exemplaires
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