Significance of defects found during high direct-voltage ramp tests

Author

McDermid, W. ; Solomon, B.G.

Author_Institution

Manitoba Hydro, Winnipeg, Man., Canada

fYear

1999

fDate

6/21/1905 12:00:00 AM

Firstpage

631

Lastpage

636

Abstract

High direct-voltage ramp tests, according to IEEE Std 95, are used to evaluate the condition of groundwall insulation in rotating machine windings. Evidence of possible defects has been found involving asphalt, polyester and epoxy bonded insulation systems. Some results reflect lack of cure or environmental conditions while other results are indicative of serious groundwall defects which may fail while the machine is in service. Action taken on the basis of the test results is discussed

Keywords

electric breakdown; electric machines; insulation testing; machine insulation; machine testing; machine windings; IEEE Std 95; asphalt insulation systems; environmental conditions; epoxy bonded insulation systems; groundwall insulation; high direct-voltage ramp tests; insulation breakdown testing; insulation condition assessment; insulation failure; polyester insulation systems; rotating machine windings; Absorption; Breakdown voltage; Current measurement; Electrostatic measurements; Insulation testing; Leakage current; Materials testing; Optical polarization; Radio frequency; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 1999. Proceedings

Conference_Location

Cincinnati, OH

ISSN

0362-2479

Print_ISBN

0-7803-5757-4

Type

conf

DOI

10.1109/EEIC.1999.826284

Filename

826284