Dépouillements

Density monitoring of high-voltage SF6 circuit breakers / Cheetham, P. in IEEE electrical insulation magazine, Vol. 31 N° 2 (Mars-Avril 2015)  

Public ISBD [article]  inIEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 6-13 Titre : Density monitoring of high-voltage SF6 circuit breakers Type de document : texte imprimé Auteurs : Cheetham, P., Auteur ; Hellany, A., Auteur ; Jones, S., Auteur Année de publication : 2015 Article en page(s) : pp. 6-13 Note générale : Electrical insulation Langues : Français (fre) Mots-clés : Circuit breakersDensity measurement Design engineering Fluorine compounds Power system reliability stability Sulphur Résumé : Circuit breakers play a vital role in ensuring the stability and reliability of a power system [1]. When a circuit breaker operates, the contacts inside the circuit breaker open and the electrical arc is extinguished resulting in the electrical circuit being interrupted [2]. Circuit breakers are named by the medium that is used to extinguish the electrical arc, with the most common type being sulfur hexafluoride (SF6) circuit breakers [3]. Figure 1 shows a typical design of a 132-kV live tank and dead tank circuit breaker. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048132&filter%3DAND% [...] [article] Density monitoring of high-voltage SF6 circuit breakers [texte imprimé] / Cheetham, P., Auteur ; Hellany, A., Auteur ; Jones, S., Auteur . - 2015 . - pp. 6-13. Electrical insulation Langues : Français (fre) in IEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 6-13 Mots-clés : Circuit breakersDensity measurement Design engineering Fluorine compounds Power system reliability stability Sulphur Résumé : Circuit breakers play a vital role in ensuring the stability and reliability of a power system [1]. When a circuit breaker operates, the contacts inside the circuit breaker open and the electrical arc is extinguished resulting in the electrical circuit being interrupted [2]. Circuit breakers are named by the medium that is used to extinguish the electrical arc, with the most common type being sulfur hexafluoride (SF6) circuit breakers [3]. Figure 1 shows a typical design of a 132-kV live tank and dead tank circuit breaker. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048132&filter%3DAND% [...]

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The practical effect of the enlargement law on the electrothermal life model for power-cable lines / Marzinotto, M. in IEEE electrical insulation magazine, Vol. 31 N° 2 (Mars-Avril 2015)  

Public ISBD [article]  inIEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 14 - 22 Titre : The practical effect of the enlargement law on the electrothermal life model for power-cable lines Type de document : texte imprimé Auteurs : Marzinotto, M., Auteur ; Mazzanti, G., Auteur Année de publication : 2015 Article en page(s) : pp. 14 - 22 Note générale : Electrical insulation Langues : Français (fre) Mots-clés : Arresters Cable shielding Earthing Lightning protection Overvoltage Power cable insulation testing overhead lines Résumé : Insulation coordination is essential for designing and testing HV cable systems properly. In transient conditions, i.e., in the presence of transient voltage surges, insulation coordination is based on the individuation of a certain maximum acceptable risk of failure under the switching and lightning overvoltages that the insulation may encounter in service, and translates into a maximum number of expected failures per year per length of line that the cable line has to match. Given the design of the cable in steady-state conditions, the number of expected failures per year and per length of cable line can be reduced by a proper design of the shield wires of overhead lines, of the grounding systems of line towers and so on, and by selecting and installing properly voltage-surge arresters when needed. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048133&filter%3DAND% [...] [article] The practical effect of the enlargement law on the electrothermal life model for power-cable lines [texte imprimé] / Marzinotto, M., Auteur ; Mazzanti, G., Auteur . - 2015 . - pp. 14 - 22. Electrical insulation Langues : Français (fre) in IEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 14 - 22 Mots-clés : Arresters Cable shielding Earthing Lightning protection Overvoltage Power cable insulation testing overhead lines Résumé : Insulation coordination is essential for designing and testing HV cable systems properly. In transient conditions, i.e., in the presence of transient voltage surges, insulation coordination is based on the individuation of a certain maximum acceptable risk of failure under the switching and lightning overvoltages that the insulation may encounter in service, and translates into a maximum number of expected failures per year per length of line that the cable line has to match. Given the design of the cable in steady-state conditions, the number of expected failures per year and per length of cable line can be reduced by a proper design of the shield wires of overhead lines, of the grounding systems of line towers and so on, and by selecting and installing properly voltage-surge arresters when needed. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048133&filter%3DAND% [...]

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Comparative investigation of silicone rubber composite and room temperature vulcanized coated glass insulators installed in coastal overhead transmission lines / Pylarinos, D. in IEEE electrical insulation magazine, Vol. 31 N° 2 (Mars-Avril 2015)  

Public ISBD [article]  inIEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 23-29 Titre : Comparative investigation of silicone rubber composite and room temperature vulcanized coated glass insulators installed in coastal overhead transmission lines Type de document : texte imprimé Auteurs : Pylarinos, D., Auteur ; Siderakis, K., Auteur ; Thalassinakis, E., Auteur Année de publication : 2015 Article en page(s) : pp. 23-29 Note générale : Electrical insulation Langues : Français (fre) Mots-clés : Composite materials Glass Marine power systems Power overhead lines transmission faults Silicone rubber insulators Résumé : The fault-free performance of outdoor insulators is a matter of great importance for power utilities as a single insulator fault may lead to an extended outage. Several factors related to operation conditions affect the performance of outdoor insulators, with pollution being probably the most significant one [1]-[3]. Coastal areas are considered heavily polluted due to the deposition of sea salt on the insulators. When the deposited salt is diluted in water through humidity, drizzle, fog, or light rain, a conductive solution is created and leakage current flows on the surface. The activity may advance, under favorable conditions, to flashover. Therefore, the local weather and climate is an important factor for the determination of pollution severity as strong winds carry more salt and frequent rains may provide natural cleaning. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048134&filter%3DAND% [...] [article] Comparative investigation of silicone rubber composite and room temperature vulcanized coated glass insulators installed in coastal overhead transmission lines [texte imprimé] / Pylarinos, D., Auteur ; Siderakis, K., Auteur ; Thalassinakis, E., Auteur . - 2015 . - pp. 23-29. Electrical insulation Langues : Français (fre) in IEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 23-29 Mots-clés : Composite materials Glass Marine power systems Power overhead lines transmission faults Silicone rubber insulators Résumé : The fault-free performance of outdoor insulators is a matter of great importance for power utilities as a single insulator fault may lead to an extended outage. Several factors related to operation conditions affect the performance of outdoor insulators, with pollution being probably the most significant one [1]-[3]. Coastal areas are considered heavily polluted due to the deposition of sea salt on the insulators. When the deposited salt is diluted in water through humidity, drizzle, fog, or light rain, a conductive solution is created and leakage current flows on the surface. The activity may advance, under favorable conditions, to flashover. Therefore, the local weather and climate is an important factor for the determination of pollution severity as strong winds carry more salt and frequent rains may provide natural cleaning. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048134&filter%3DAND% [...]

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A comparison of thermoset and thermoplastic arc chutes in molded-case circuit breakers under fault clearing / Beema Thangarajan, R. in IEEE electrical insulation magazine, Vol. 31 N° 2 (Mars-Avril 2015)  

Public ISBD [article]  inIEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 30-35 Titre : A comparison of thermoset and thermoplastic arc chutes in molded-case circuit breakers under fault clearing Type de document : texte imprimé Auteurs : Beema Thangarajan, R., Auteur ; Chetwani, S., Auteur ; Shrinet, V., Auteur Année de publication : 2015 Article en page(s) : pp. 30-35 Note générale : Electrical insulation Langues : Français (fre) Mots-clés : Circuit breakers Circuit-breaking arcs Electrical contacts Plectromagnetic actuators Power distribution faults protection Thermal insulating materials Résumé : Molded-case circuit breakers (MCCB) are vital devices that are used in many distribution systems for protection from faults in the network. During a fault, a large increase in current passes through the terminals of the MCCB and the contacts open by electromagnetic actuation. On opening, a low-voltage arc is struck between the contacts, forming a high-temperature plasma of thousands of degrees Celsius. The plasma causes thermal degradation of the insulating materials and erosion of the contacts and is a source of intense UV, which may further cause degradation of the insulating materials. In the case of a polyester based MCCB, electrically conductive soot is produced, which is detrimental to the long-term performance of the device. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048135&filter%3DAND% [...] [article] A comparison of thermoset and thermoplastic arc chutes in molded-case circuit breakers under fault clearing [texte imprimé] / Beema Thangarajan, R., Auteur ; Chetwani, S., Auteur ; Shrinet, V., Auteur . - 2015 . - pp. 30-35. Electrical insulation Langues : Français (fre) in IEEE electrical insulation magazine > Vol. 31 N° 2 (Mars-Avril 2015) . - pp. 30-35 Mots-clés : Circuit breakers Circuit-breaking arcs Electrical contacts Plectromagnetic actuators Power distribution faults protection Thermal insulating materials Résumé : Molded-case circuit breakers (MCCB) are vital devices that are used in many distribution systems for protection from faults in the network. During a fault, a large increase in current passes through the terminals of the MCCB and the contacts open by electromagnetic actuation. On opening, a low-voltage arc is struck between the contacts, forming a high-temperature plasma of thousands of degrees Celsius. The plasma causes thermal degradation of the insulating materials and erosion of the contacts and is a source of intense UV, which may further cause degradation of the insulating materials. In the case of a polyester based MCCB, electrically conductive soot is produced, which is detrimental to the long-term performance of the device. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7048135&filter%3DAND% [...]

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