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Electrical Characterization of a New Enamel Insulation

Anh Hoang (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Yuriy Serdyuk (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Stanislaw Gubanski (Institutionen för material- och tillverkningsteknik, Högspänningsteknik)
IEEE transactions on dielectrics and electrical insulation (1070-9878). Vol. 21 (2014), 3, p. 1291-1301.
[Artikel, refereegranskad vetenskaplig]

Investigations of dielectric properties of a newly developed enamel wire insulation created by adding chromium (III) oxide (Cr2O3) filler to polyamide-imide enamel base are presented. Results of measurements of electrical conductivity and complex permittivity at various temperatures as well as surface potential decay are discussed and compared with corresponding properties of standard enamel insulation. Contributions of different polarization relaxation processes in both enamels are examined based on the obtained master curves of dielectric response. In addition, the properties of chromium oxide filler are characterized separately and utilized further for analyzing its impact on the performance of enamel wire insulation by means of computer simulations. The experimental and simulated results demonstrate that the introduction of chromium oxide yields changes in the electrical properties that allow for mitigating the voltage stress in a wound insulation system. Furthermore, a correlation between the obtained results and the earlier described improved resistance to partial discharge activity of the chromium oxide filled enamel is discussed.

Nyckelord: Enamel insulation, conductivity measurement, permittivity measurement, surface potential decay, dielectric polarization, dielectric losses.

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Denna post skapades 2014-06-19. Senast ändrad 2015-02-11.
CPL Pubid: 199423