Modeling the inter-phase region of high voltage transformers

Zainuddin, Hidayat and Lewin, P.L. and Mitchinson, P.M. (2011) Modeling the inter-phase region of high voltage transformers. In: 17th IEEE International Conference on Dielectric Liquids, 26-30 June 2011, Trondheim, Norway.

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In large oil-filled power transformers, pressboard and paper in conjunction with oil are used throughout to provide electrical insulation. Microscopic views have shown that pressboard insulation is a fibrous and porous structure with a non-homogeneous surface. The porosity of pressboard can result in impurities within the oil being drawn into the oil-impregnated pressboard. The material properties and geometry of pressboard thus lead to a complex oil-pressboard interface. A 2-D model of oil-pressboard interface considering the porous and non-homogeneous of pressboard has been constructed using Finite Element Analysis software, COMSOL Multiphysics. This paper discusses the mathematical equations used to study the electric double layer (EDL) at the oil-pressboard interface where the oil is in a stationary condition. Subsequently, the simulation results of non-equilibrium charge density profile at the interface are also presented.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Electrical Engineering > Department of Industrial Power
Depositing User: Dr Hidayat Zainuddin
Date Deposited: 28 Mar 2014 02:04
Last Modified: 28 May 2015 04:20
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