Quality evaluation of stator coils and bars under thermal cycling stress

Author

Zhu, H. ; Morton, C. ; Cherukupalli, S.

Author_Institution

Powertech Labs.

fYear

2006

fDate

11-14 June 2006

Firstpage

384

Lastpage

387

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 2006. Conference Record of the 2006 IEEE International Symposium on

Conference_Location

Toronto, Ont.

ISSN

1089-084X

Print_ISBN

1-4244-0333-2

Type

conf

DOI

10.1109/ELINSL.2006.1665338

Filename

1665338