Generator upgrade without stator rewinding

Author

Timperley, J.E.

Author_Institution

American Electr. Power Service Corp., Columbus, OH, USA

fYear

1999

fDate

6/21/1905 12:00:00 AM

Firstpage

617

Lastpage

618

Abstract

It can be expected that a hydrogenerator stator winding may require replacement when a machine is upgraded more than 25%. A case study is presented where detailed thermal and electrical analysis was performed on spare stator coils purchased when the stator winding of a 158 MVA machine was last rewound in 1988. Results of these accelerated aging tests indicated that continued safe operation of the existing ten-year-old stator coils with an expected turbine upgrade of 27% was possible. Capability tests conducted since the upgrade indicate temperature limitations for the existing insulation system will not be exceeded during normal operation at 200 MVA. Results of thermal and electrical aging tests are presented

Keywords

ageing; hydroelectric generators; life testing; stators; thermal analysis; 158 MVA; accelerated aging tests; capability tests; electrical analysis; hydrogenerator stator winding; hydrogenerator upgrade; safe operation; stator coils; stator winding; thermal analysis; Accelerated aging; Coils; History; Insulation testing; Life estimation; Life testing; Stator windings; System testing; Temperature; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 1999. Proceedings

Conference_Location

Cincinnati, OH

ISSN

0362-2479

Print_ISBN

0-7803-5757-4

Type

conf

DOI

10.1109/EEIC.1999.826280

Filename

826280