Voltage Endurance of Mica Insulation Systems for Rotating Machineries

Tsukui, Tsutomu; Takahashi, Genji; Isogai, T.

doi:10.1541/ieejfms1972.96.463

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the aging of polyurethane is characterized by a gaseous emission as well as a matter deposit on the steel electrode which was cleaned after each test. The presence of three and even four zones has been also observed elsewhere for other polymers 22…”

Section: Resultssupporting

confidence: 78%

Electrical aging of polyurethane under ac voltage

Nedjar

Béroual

2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

The electrical aging of polyurethane under ac voltage has been investigated using Weibull statistical analysis. It is shown that the time to breakdown characteristic (V-t) of this polymer includes three zones corresponding, respectively, to the youth defects, the statistical dispersion of the intrinsic defects, and the real aging of the polymer. The variation of slope of the V-t curve is related to the change of the degradation mechanism. This degradation is governed by the action of partial discharges according to three stages: (1) the appearance of very fast discharges within the cavities; (2) the initiation of discharges resulting of a very thin layer of oxidation products; and (3) the formation of crystals having small dimensions leading to degradation by electrical tree.

show abstract

Section: Resultssupporting

confidence: 78%

Electrical aging of polyurethane under ac voltage

Nedjar

Béroual

2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Each zone corresponds to a given type of aging. The presence of several segments of straight line in lifetime characteristic has been reported elsewhere 1, 3, 18. Note that the weaker the applied voltage, the longer the time to breakdown is.…”

Section: Resultssupporting

confidence: 65%

“…These defects called “youth defects” can be either solid impurities or cavities. The application of voltage can induce local enhancements of the electric field at these defects resulting in the initiation and development of partial discharges that can lead to the partial and/or total deterioration of insulation (i.e., chemical modifications of material and change of the electrical and mechanical properties) 1–3. The analyze of the mechanisms of degradation by partial discharges in solid insulating materials has been the subject of numerous studies 4–8.…”

Section: Introductionmentioning

confidence: 99%

Weibull statistics in electrical aging of polyesterimide under AC voltage

Nedjar

Béroual

2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

This article is aimed at the investigation of electrical aging of polyesterimide under AC voltage using Weibull statistical analysis. It's shown that the time to breakdown characteristic (V-t) of polyesterimide includes two zones (segments of straight line). The first zone characterizes a statistical dispersion of the intrinsic defects of material. The second zone expresses the real aging of polymer. The variation of the slope of lifetime curve is attributed to the change in the degradation mechanism.

show abstract

A Method to Estimate the Lifetime of Solid Electrical Insulation

Hirose¹

1987

IEEE Trans. Elect. Insul.

View full text Add to dashboard Cite

Voltage Endurance of Mica Insulation Systems for Rotating Machineries

Cited by 3 publications

References 0 publications

Electrical aging of polyurethane under ac voltage

Electrical aging of polyurethane under ac voltage

Weibull statistics in electrical aging of polyesterimide under AC voltage

A Method to Estimate the Lifetime of Solid Electrical Insulation

Contact Info

Product

Resources

About