Assessment of insulation condition of hydro generator stator bars after 40 years in service

Author

Klamt, Thomas ; Hillmer, Thomas ; Vannay, Francois

Author_Institution

R&D Winding Technol., Alstom (Switzerland) Ltd., Birr, Switzerland

fYear

2011

fDate

5-8 June 2011

Firstpage

244

Lastpage

248

Abstract

Long-term field experience and the knowledge of the condition of stator bar insulation after long periods of operation are key points for ensuring reliable operation of stator windings. The ALSTOM Micadur^® insulation system, first introduced for generators in 1958, has such long-term field experience. This system is in service over the whole power range of hydro and turbo generators, represented by a fleet of more than 10,000 machines between 5 MVA and 1944 MVA. ALSTOM had the opportunity to investigate the condition of 8 operation-aged Micadur^® bars of a hydro generator, since the owner was replacing the stator core and stator winding.

Keywords

hydroelectric generators; machine insulation; stators; turbogenerators; ALSTOM Micadur; Micadur bars; apparent power 5 MVA to 1944 MVA; hydro generator stator bars; insulation condition; long-term field experience; stator bar insulation; stator windings; turbogenerators; Bars; Generators; Insulation; Stator bars; Stator windings; Windings; Generators; Insulation System; Lifetime; Lifetime Assessment; Mica-Insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference (EIC), 2011

Conference_Location

Annapolis, MD

ISSN

pending

Print_ISBN

978-1-4577-0278-5

Electronic_ISBN

pending

Type

conf

DOI

10.1109/EIC.2011.5996155

Filename

5996155