Research to correct misconceptions regarding significance of PI and IR testing of motors

Gradin, L.P.; Olson, David E.

doi:10.1109/nssmic.1994.474650

Cited by 4 publications

(1 citation statement)

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“…The well-known parameters, insulation resistance (IR) and polarization index (Pn, are extracted from the charge current flowing through the insulating material after the application of a Dc step voltage. These two parameters have been systematically measured for stator windings for decades [61. However, reservations as to their potential to assess the state of the insulation have k e n expressed [7]. Obviously, an improvement of the simple megaohmeter test can be achieved by recording both charge and discharge currents over several time decades instead of measuring two points of the charge current (1 and 10 minutes).…”

Section: Introductionmentioning

confidence: 99%

Investigation on the low frequency dielectric response of ground-wall insulation of rotating machine windings

David

Taghizad²,

Lamarre³

et al.

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Abstrad: 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 volrage 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 laboratoly as well as on complete windings in the field.

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Section: Introductionmentioning

confidence: 99%