Characteristic Analyses of Commercial Single-phase High-efficiency Transformers
Abstract The aim of this thesis is to analyze the influence of different lamination shape and its improvement on magnetic field distribution inside the iron core of single-phase transformers.
Traditionally, the laminated core is generally adopted and the laminated iron sheets are cut in E-shape and I-shape sheets to reduce core loss in the studied transformer. The reluctance of the magnetic flux path inside the iron core of the studied transformer is affected by the condition of press, shape of laminated core property, effective length and area of flux path. To reduce the reluctance between connection points, the E-shape and I-shape laminated sheets are interchanged to avoid obvious connection line between laminated sheets. This thesis is to simulate magnetic filed distribution of single-phase transformers using electromagnetic field software. The effectiveness of the improved E- and I-shape laminated core will be evaluated in depth for future design of single-phase low-voltage distribution transformers with high-quality, high efficiency, and low core loss.
For simulate the inrush current, another model of single-phase transformer written by FORTRAN is compared with experience in this thesis.
FULL THESIS HERE;http://etdncku.lib.ncku.edu.tw/ETD-db/ETD-search/getfile?URN=etd-0706104-111050&filename=etd-0706104-111050.pdf
"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"
“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”
“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”
sábado, 5 de março de 2011
A STUDY ON ELECTRONIC BALLAST FOR HARMONIC REDUCTION
A STUDY ON ELECTRONIC BALLAST FOR HARMONIC REDUCTION
AUTHOR: HYUN MOO LEE
ADVISOR : HEE-SEOK KOH
DEPT. OF ELECTRICAL ENGINEERING
KYUNGNAM UNIVERSITY
FUL PAPER HERE:
http://www.4shared.com/document/zkSc7EgN/ELECTRONICBALLASTHARMONIC.html
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