Title :
Modeling the inter-phase region of high voltage transformers
Author :
Zainuddin, H. ; Lewin, P.L. ; Mitchinson, P.M.
Author_Institution :
Tony Davies High Voltage Lab., Univ. of Southampton, Southampton, UK
Abstract :
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.
Keywords :
electrochemistry; finite element analysis; geometry; liquid theory; paper; power transformer insulation; transformer oil; 2D oil-pressboard interface model; COMSOL multiphysics; EDL; electric double layer; electrical insulation; fibrous structure; finite element analysis software; high voltage transformer; interphase region modeling; mathematical equation; nonequilibrium charge density profile; oil-filled power transformer; oil-impregnated pressboard; paper insulation; porous structure; pressboard insulation; Conductivity; Equations; Impurities; Ions; Mathematical model; Power transformers; Space charge; electric double layer; oil-pressboard interface; physicochemical reaction;
Conference_Titel :
Dielectric Liquids (ICDL), 2011 IEEE International Conference on
Conference_Location :
Trondheim
Print_ISBN :
978-1-4244-7352-6
Electronic_ISBN :
2153-3725
DOI :
10.1109/ICDL.2011.6015422