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Additional losses in the damper winding of large hydrogenerators at open-circuit and load conditions / Traxler-Samek, Georg in IEEE transactions on industrial electronics, Vol. 57 N° 1 (Janvier 2010) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 57 N° 1 (Janvier 2010) . - pp. 154 - 160 Titre : Additional losses in the damper winding of large hydrogenerators at open-circuit and load conditions Type de document : texte imprimé Auteurs : Traxler-Samek, Georg, Auteur ; Lugand, Thomas, Auteur ; Schwery, Alexander, Auteur Article en page(s) : pp. 154 - 160 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : AC  generators  AC  machines  Equivalent  circuits  Losses  Machine  windings  Synchronous  generators  Synchronous  machines  Windings Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : Large salient-pole synchronous machines are typically equipped with a damper winding. At steady-state conditions, parasitic voltages are induced in the damper bars which lead to a current flow with associated power losses. This paper describes an analytical algorithm for the calculation of currents and corresponding losses in the damper winding. The presented method is based on an equivalent network of the damper winding containing all the bars of a repetitive section of the machine. The inductances are calculated with an air-gap permeance model. Contrary to similar existing approaches, the induced damper-bar voltages are computed using a numerical integration. This allows more precise results when it comes to higher harmonics. In order to validate the analytical computation, the results are compared with the results of 2-D transient finite-element studies and with a conventional analytical method based on the d-and q -axis equivalent circuits of the machine. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5166502 [article] Additional losses in the damper winding of large hydrogenerators at open-circuit and load conditions [texte imprimé] / Traxler-Samek, Georg, Auteur ; Lugand, Thomas, Auteur ; Schwery, Alexander, Auteur . - pp. 154 - 160. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 1 (Janvier 2010) . - pp. 154 - 160 Mots-clés : AC  generators  AC  machines  Equivalent  circuits  Losses  Machine  windings  Synchronous  generators  Synchronous  machines  Windings Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : Large salient-pole synchronous machines are typically equipped with a damper winding. At steady-state conditions, parasitic voltages are induced in the damper bars which lead to a current flow with associated power losses. This paper describes an analytical algorithm for the calculation of currents and corresponding losses in the damper winding. The presented method is based on an equivalent network of the damper winding containing all the bars of a repetitive section of the machine. The inductances are calculated with an air-gap permeance model. Contrary to similar existing approaches, the induced damper-bar voltages are computed using a numerical integration. This allows more precise results when it comes to higher harmonics. In order to validate the analytical computation, the results are compared with the results of 2-D transient finite-element studies and with a conventional analytical method based on the d-and q -axis equivalent circuits of the machine. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5166502