Title :
Investigation on the low frequency dielectric response of ground-wall insulation of rotating machine windings
Author :
David, E. ; Taghizad, R. ; Lamarre, L. ; Nguyen, Duc N.
Author_Institution :
Ecole de Technologie Superieure, Montreal, Que., Canada
Abstract :
In order to assess the quality of stator winding insulation, laboratory and field instruments measuring the charge and discharge currents flowing through rotating machine ground-wall winding insulation were developed. These instruments apply a dc voltage step during a variable charging time at various voltage levels followed by a discharge step during which the insulating dielectric is shorted to ground. The current is continuously monitored during both the charge and the discharge steps. An investigation was conducted for epoxy-mica insulation systems in laboratory as well as on complete windings in the field.
Keywords :
dielectric polarisation; dielectric relaxation; epoxy insulation; machine windings; mica; stators; charge currents; complete windings; discharge currents; discharge step; epoxy-mica insulation systems; ground-wall insulation; low frequency dielectric response; rotating machine windings; stator winding insulation; variable charging time; Current measurement; Dielectric devices; Dielectrics and electrical insulation; Frequency; Instruments; Laboratories; Machine windings; Rotating machines; Stator windings; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2003. Annual Report. Conference on
Print_ISBN :
0-7803-7910-1
DOI :
10.1109/CEIDP.2003.1254818