Qualification test results on stator bars of large hydro generators

Author

Soltani, Reza ; Lafortune, Luc ; Draper, Robert ; Khosravi, Amir

Author_Institution

Andritz Hydro Ltd., Peterborough, ON, Canada

fYear

2012

fDate

10-13 June 2012

Firstpage

596

Lastpage

600

Abstract

Thermal cycling and voltage endurance test (VET) are the most common tests used to qualify insulation systems of bars or coils of large rotating machines. This paper reports the results of these tests on 13.8 and 16 kV hydro generator bars. Partial discharge (PD), dissipation factor (DF) and tip-up tests are used as quantitative tests to assess the changes in condition of the insulation due to accelerated thermal and electrical aging. Breakdown tests were also performed to evaluate the effect of different stages of aging on dielectric strength of the bars.

Keywords

electric machines; hydroelectric generators; machine testing; partial discharges; stators; bars insulation systems; coils insulation systems; dielectric strength; dissipation factor; electrical aging; hydro generators; partial discharge; quantitative tests; rotating machines; stator bars; thermal aging; thermal cycling; tip-up tests; voltage 13.8 kV; voltage 16 kV; voltage endurance test; Aging; Bars; IEEE standards; Insulation; Partial discharges; Stress; Voltage measurement; dissipation factor; insulation system; partial discharges; thermal cycling; voltage endurance;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation (ISEI), Conference Record of the 2012 IEEE International Symposium on

Conference_Location

San Juan, PR

ISSN

1089-084X

Print_ISBN

978-1-4673-0488-7

Electronic_ISBN

1089-084X

Type

conf

DOI

10.1109/ELINSL.2012.6251540

Filename

6251540