Normal Flux Distribution in a Three-Phase Transformer Core Under Sinusoidal and PWM Excitation

Author

Yao, Xiao Guang ; Moses, Anthony J. ; Anayi, Fatih

Author_Institution

Sch. of Eng., Cardiff Univ.

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2660

Lastpage

2662

Abstract

Transformer no-load loss and noise have been reduced considerably because of improved core material and improved core design. The variation of normal or interlaminar flux distribution (z direction) in a three-phase transformer core has been measured under pulse width modulation (PWM) excitation (no-load) with switching frequencies in the range of 1-3 kHz. The planar eddy current loss and attractive interlaminar force were analyzed for selected values of modulation index and magnetization condition (frequency 50 Hz; induction 1.5 T). Results showed significant reduction of the planar eddy current component and attractive interlaminar force for low modulation index with increasing switching frequency

Keywords

eddy current losses; magnetic flux; power transformers; transformer cores; 1 to 3 kHz; PWM excitation; interlaminar flux distribution; modulation index; normal flux distribution; planar eddy current loss; switching frequency; three-phase transformer core; Eddy currents; Frequency measurement; Magnetic cores; Noise reduction; Phase transformers; Pulse measurements; Pulse transformers; Pulse width modulation; Switching frequency; Transformer cores; Attractive interlaminar force; PWM; normal flux; planar eddy current; switching frequency;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893782

Filename

4202976