Analysis of leakage magnetic problems in shell-form power transformer

Author

Xiang, Cui ; Jinsha, Yuan ; Guoqiang, Zhang ; Yuanlu, Zhang ; Qifan, Hu

Author_Institution

Dept. of Electr. Eng., North China Electric Power Univ., Hebei, China

Volume

33

Issue

2

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

2049

Lastpage

2052

Abstract

The principles of minimized magnetic energy and voltage equilibrium have been combined with the finite element method to solve the leakage magnetic field problems coupled with an unknown ampere-turn distribution in shell-form power transformers. Based on the leakage magnetic field calculated, the eddy current and circulating current losses in the coils are further computed. The calculated results are consistent with measured values for a model of a shell-form power transformer. The above principles are applied to the windings design of a 50 MVA three-phase prototype shell-form power transformer. The calculated results show that the largest circulating current in strands of the low-voltage coils near two ends of each phase winding is greatly reduced to 11% from 98% of the rated current in each strand by placing the copper-shieldings on these ends

Keywords

eddy current losses; finite element analysis; magnetic leakage; power transformers; transformer windings; 50 MVA; ampere-turn distribution; circulating current; circulating current losses; eddy current loss; finite element method; leakage magnetic problems; low-voltage coils; minimized magnetic energy; shell-form power transformer; transformer coils; voltage equilibrium; Coils; Couplings; Eddy currents; Equations; Finite element methods; Magnetic analysis; Magnetic field measurement; Magnetic fields; Power transformers; Prototypes;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.582716

Filename

582716