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- Title
Hydrolytic Aging of Wire Enameled with Polyesterimide and Polyamide Imide Used in Electrical Machines.
- Authors
Kerkarine, Fatima; Nedjar, Mohammed
- Abstract
This paper reports the influence of hydrolytic aging on the rupture voltage of copper wire enameled with polyestermide reinforced by a polyamide imide layer. A large population of samples was put in a climatic chamber regulated at 40°C and 93% relative humidity. The wet aging was carried out until 15000h. Every time of 500h, 80 samples were taken from the climatic chamber and submitted to AC breakdown test. A statistic investigation of breakdown voltage values was done using Weibull model. Scale parameter, shape parameter and confidence intervals are presented. The breakdown voltage changes in function of aging time. The raise is ascribed to the arrangement in the structure of the polymer. While its lowering is assigned to the diminution in the viscosity causing a raise of mean free path of charge carriers. The shape parameter changes versus aging time. The shortening is due to the increase in the size of defects. Whereas its raise is allotted to the arrangement in the structure. TGA shows a variation of the onset temperature and the residue during the aging. The FTIR tests show a weak modification of the spectra. There is no degradation of the insulation, however a change in molecular conformation occurs. The results are analyzed and discussed.
- Subjects
BREAKDOWN voltage; MOLECULAR conformation; COPPER wire; ENAMEL &; enameling; POLYMER structure; POLYAMIDES
- Publication
Mathematical Modelling of Engineering Problems, 2024, Vol 11, Issue 4, p1053
- ISSN
2369-0739
- Publication type
Article
- DOI
10.18280/mmep.110423