Comparative analysis of stator iron core damage using nominal and reduced flux

Author

Gavric, M. ; Senjamin, M. ; Kotlica, M.

Author_Institution

INT, Belgrade, Yugoslavia

fYear

1999

fDate

6/21/1905 12:00:00 AM

Firstpage

619

Lastpage

621

Abstract

Good quality of insulation between stator iron laminations is one of the major preconditions for proper operation and top performance of generating units. Local hot spots and overheating as a result of insufficient insulation between stator iron laminations, beside the other problems, will cause premature aging of high voltage insulation in stator bars. This type of test can be done with generator in regular operation or during an outage. The most reliable results are achieved during an outage, when the rotor is removed. Two methods for testing stator lamination insulation were compared on an 125 MVA turbogenerator. The purpose was to compare the results of the tests using methods with full and reduced flux

Keywords

electric breakdown; insulation testing; laminations; machine insulation; machine testing; stators; turbogenerators; full flux methods; generating units; generator insulation quality; high-voltage insulation ageing; insulation breakdown testing; local hot spots; overheating; reduced flux methods; stator iron core damage; stator iron laminations; stator lamination insulation testing; turbogenerator; Coils; Heating; Insulation; Iron; Lamination; Magnetic flux; Stator cores; Teeth; Testing; 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.1999.826281

Filename

826281