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Modeling the inter-phase region of high voltage transformers

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3 Author(s)
H. Zainuddin ; The Tony Davies High Voltage Laboratory, University of Southampton, SO17 1BJ, United Kingdom ; P. L. Lewin ; P. M. Mitchinson

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.

Published in:

2011 IEEE International Conference on Dielectric Liquids

Date of Conference:

26-30 June 2011