Analysis of Transient Electric Field and Charge Density of Converter Transformer Under Polarity Reversal Voltage

Author

Liu, Gang ; Li, Lin ; Ji, Feng ; Li, Wenping ; Sun, Youliang ; Li, Bo ; Li, Jinzhong

Author_Institution

State Key Lab. of Alternate Electr. Power Syst. with Renewable Energy Sources, North China Electr. Power Univ., Beijing, China

Volume

48

Issue

2

fYear

2012

Firstpage

275

Lastpage

278

Abstract

A finite element method, which directly uses the node electric scalar potentials and node charge densities as variables, is used to predict the electric field and charge density distributions under polarity reversal (PR) voltage. The penalty method is adopted to impose the Dirichlet boundary values and the Crank-Nicolson (C-N) algorithm is then used to solve the transient equation. The surface node charge densities on the perfectly conducting boundaries are adopted to accurately obtain the normal electric field strengths. The method is tested by a two layer coaxial model and applied to analyze the linear and nonlinear transient electric fields and boundary charge densities of a ±500 kV converter transformer under PR voltage.

Keywords

finite element analysis; power transformers; surface charging; Crank-Nicolson algorithm; Dirichlet boundary values; charge density; converter transformer; finite element method; node charge densities; node electric scalar potentials; polarity reversal voltage; transient electric field; Electric potential; Equations; Finite element methods; Mathematical model; Oil insulation; Power transformer insulation; Transient analysis; Converter transformer; charge density; electric field; finite element;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2174621

Filename

6136668