The role of AC & DC hipot testing in stator winding ageing

Author

Sedding, H.G. ; Schwabe, R. ; Levin, D. ; Stein, J. ; Gupta, B.K.

Author_Institution

Kinectrics Inc., Toronto, Ont., Canada

fYear

2003

fDate

23-25 Sept. 2003

Firstpage

455

Lastpage

457

Abstract

A recent EPRI survey on practices associated with the use of AC and DC hipot testing for maintenance purposes on rotating machines indicated that some in the utility industry were concerned that the hipot, or repeated applications thereof, may cause ageing of the stator insulation. Consequently, a study of this issue was performed using a failed hydraulic generator stator winding. AC and DC hipots were systematically applied to several bar groups followed by breakdown testing using AC potential. The results of the test program including their implications will be discussed in the proposed contribution.

Keywords

ageing; electric breakdown; electric machines; insulation testing; machine insulation; stators; AC hipot testing; DC hipot testing; EPRI survey; Electric Power Research Institute; alternating current; breakdown test; direct current; hydraulic generator; insulation testing; rotating machines; stator insulation ageing; stator winding; Aging; Bars; Dielectrics and electrical insulation; Electric breakdown; Insulation testing; Life testing; Performance evaluation; Production facilities; Stator windings; System testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Technology Conference, 2003. Proceedings

ISSN

0362-2479

Print_ISBN

0-7803-7935-7

Type

conf

DOI

10.1109/EICEMC.2003.1247927

Filename

1247927