Title :
Quality evaluation of stator coils and bars under thermal cycling stress
Author :
Zhu, H. ; Morton, C. ; Cherukupalli, S.
Author_Institution :
Powertech Labs.
Abstract :
This paper presents our recent experience in quality evaluation of stator coils and bars during thermal cycling (TC) tests using several diagnostic tools. Diagnostic tests, such as tap tests, dissipation factor tests, partial discharge tests, and capacitance measurements were conducted to evaluate the insulation condition during and after thermal cycling testing. Thermal cycling tests accompanied with the diagnostic tests can help to identify defects in the quality and performance of coils/bars. Bars/coils which can pass a VE test may have severe delamination and defects during a TC test. Since there are no pass/fall criteria for TC testing in the current IEEE Std 1310-1996, voltage endurance (VE) testing following TC testing has been proposed as an alternative pass/fail criterion for quality evaluation of stator coils/bars
Keywords :
IEEE standards; bars; capacitance measurement; coils; delamination; machine insulation; machine testing; stators; IEEE Std 1310-1996; bar; capacitance measurement; defect identification; delamination; insulation condition; quality evaluation; stator coil; thermal cycling stress; voltage endurance test; Bars; Capacitance measurement; Coils; Delamination; Insulation testing; Partial discharges; Stators; Thermal conductivity; Thermal factors; Thermal stresses;
Conference_Titel :
Electrical Insulation, 2006. Conference Record of the 2006 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
Print_ISBN :
1-4244-0333-2
DOI :
10.1109/ELINSL.2006.1665338
