Comparison between a permeance network model and a 2D finite element model for the inrush current computation in a three phase transformer

Author

Richard, N. ; Szylowicz, N.

Author_Institution

Dir. des Etudes et Recherches, Electr. de France, Clamart, France

Volume

30

Issue

5

fYear

1994

fDate

9/1/1994 12:00:00 AM

Firstpage

3232

Lastpage

3235

Abstract

To compute inrush currents in a three phase transformer, a transformer magnetic model coupled with circuit equations is needed. In this paper, we compare a permeance network model and a 2D finite element one. The precision of a model for the inrush current computation is equal to its accuracy concerning the calculation of the winding current with enforced winding flux values. To evaluate this accuracy, we have taken, as reference values, the values computed by means of a 3D finite element model. We conclude that the permeance network model accuracy is about 30%, while the 2D model accuracy is 140%. Finally the inrush currents are calculated using the permeance network model and compared to experimental measurements. The measured inrush current wave shape matches well with the numerical one

Keywords

current transformers; electromagnetism; finite element analysis; power transformers; transformer windings; 2D finite element model; 2D model accuracy; 3D finite element model; circuit equations; enforced winding flux values; inrush current computation; inrush current wave shape; permeance network model; permeance network model accuracy; reference values; three phase transformer; transformer magnetic model; winding current; Accuracy; Coupling circuits; Current measurement; Equations; Finite element methods; Magnetic circuits; Magnetic flux; Phase transformers; Shape measurement; Surges;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.312626

Filename

312626