Title :
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
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;
Conference_Titel :
Electrical Insulation (ISEI), Conference Record of the 2012 IEEE International Symposium on
Conference_Location :
San Juan, PR
Print_ISBN :
978-1-4673-0488-7
Electronic_ISBN :
1089-084X
DOI :
10.1109/ELINSL.2012.6251540
