Title :
Significance of defects found during high direct-voltage ramp tests
Author :
McDermid, W. ; Solomon, B.G.
Author_Institution :
Manitoba Hydro, Winnipeg, Man., Canada
fDate :
6/21/1905 12:00:00 AM
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;
Conference_Titel :
Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 1999. Proceedings
Conference_Location :
Cincinnati, OH
Print_ISBN :
0-7803-5757-4
DOI :
10.1109/EEIC.1999.826284
