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Article Dans Une Revue Journal of Applied Polymer Science Année : 2008

Electrical aging of polyurethane under AC voltage

Résumé

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.

Dates et versions

hal-00312913 , version 1 (26-08-2008)

Identifiants

Citer

Mohammed Nedjar, Abderrahmane Beroual. Electrical aging of polyurethane under AC voltage. Journal of Applied Polymer Science, 2008, 109 (2), pp.789-794. ⟨10.1002/app.28139⟩. ⟨hal-00312913⟩
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