Time Domain Diffusion-Driven Dielectric Response Model for Investigation of Moisture Dynamics in Transformers Insulation
Author(s)
Cui, Yi
Ma, Hui
Saha, Tapan
Ekanayake, Chandima
Martin, Daniel
Griffith University Author(s)
Year published
2015
Metadata
Show full item recordAbstract
In this paper a time domain diffusion-driven model is presented to investigate the correlation between the distribution of moisture during thermal transients, and the resultant polarization and depolarization current (PDC) measurement, for transformer cellulosic insulation. The oil-impregnated cellulosic insulation is modeled as being multiple layers of paper, with each layer having a different permittivity and conductivity. The non-uniform distribution of moisture occurring during diffusion was taken into consideration. The correlation between moisture concentration and conductivity of the cellulose insulation was investigated. ...
View more >In this paper a time domain diffusion-driven model is presented to investigate the correlation between the distribution of moisture during thermal transients, and the resultant polarization and depolarization current (PDC) measurement, for transformer cellulosic insulation. The oil-impregnated cellulosic insulation is modeled as being multiple layers of paper, with each layer having a different permittivity and conductivity. The non-uniform distribution of moisture occurring during diffusion was taken into consideration. The correlation between moisture concentration and conductivity of the cellulose insulation was investigated. Then, the dielectric response of the cellulose was computed and the dielectric relaxation behavior affected by the moisture dynamics was modelled. The moisture diffusion experiments were conducted on a test transformer to verify the proposed model.
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View more >In this paper a time domain diffusion-driven model is presented to investigate the correlation between the distribution of moisture during thermal transients, and the resultant polarization and depolarization current (PDC) measurement, for transformer cellulosic insulation. The oil-impregnated cellulosic insulation is modeled as being multiple layers of paper, with each layer having a different permittivity and conductivity. The non-uniform distribution of moisture occurring during diffusion was taken into consideration. The correlation between moisture concentration and conductivity of the cellulose insulation was investigated. Then, the dielectric response of the cellulose was computed and the dielectric relaxation behavior affected by the moisture dynamics was modelled. The moisture diffusion experiments were conducted on a test transformer to verify the proposed model.
View less >
Conference Title
2015 IEEE Power and Energy Society General Meeting
Subject
Electrical and Electronic Engineering not elsewhere classified