The J&P Transformer Book 12E

The J&P Transformer Book 12E

Design of Transformers Por Indrajit Dasgupta

An Overview on Amorphous Core Transformers Man Mohan Electrical Engineering Department

Abstract
In this paper, an amorphous core transformer is highlighted. Configuration of amorphous C-core and its magnetisation characteristic (B-H) are described. Factors affecting the design are also discussed as a comparison with a conventional transformer. It is concluded that, advantages with amorphous core transformers are - low core losses, low magnetising current, less zero sequence current, less noise, higher efficiency and longer life; however the disadvantages are higher inrush current, more harmonic problem, bigger size and higher initial cost. The problem of third harmonic may be eliminated by adopting zig-zag connection in place of star connection. Purpose of this article is to provide a knowledge base about amorphous core transformers, to students of transformer design, by discussing some necessary issues. __________________________________________________________________________________________ LINK
http://www.mediafire.com/?1kicbyeispkdgqe

Amorphous-Core Transformer with Copper Winding Versus Aluminium Winding-A Comparative Study

 

ABSTRACT
Amorphous core transformers are in developing stage; they are considered as energy efficient transformers. Cost of amorphous core transformer is about 20 to 30 per cent higher than that of a conventional transformer of same KVA rating. Among several parameters, cost of winding material is a parameter, on which cost of a transformer depends. In a transformer, the cost of winding material may be up to 28 per cent of overall cost of a transformer. Cost of a transformer may be reduced if aluminum winding is adopted in place of copper winding; aluminum is lighter in weight and cheaper in price, compared to copper winding. Here, a comparative study is presented for an amorphous core transformer with copper winding versus aluminum winding, in terms of cost efficiency and mechanical forces. It has been found that, if aluminum winding is adopted for 400KVA amorphous core transformer, the cost reduces, efficiency improves and mechanical forces.
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http://www.ejournalofscience.org/archive/vol2no4/vol2no4_4.pdf

UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL ESCOLA DE ENGENHARIA DEPARTAMENTO DE ENGENHARIA ELÉTRICA MÁRCIO MOURA DE MATTOS PROJETO DE DIPLOMAÇÃO ESTUDO DO FATOR K EM TRANSFORMADORES A SECO BRASIL

RESUMO Este trabalho tem por finalidade apresentar um estudo sobre harmônicas suas causas e suas conseqüências em instalações elétricas. Será realizado um estudo da decomposição dos sinais de energia elétrica através da decomposição da Séria de Fourier, a partir da qual serão mostrada e calculada as diferente ordens das harmônicas Será dada ênfase nas conseqüências dessas em transformadores a seco. Onde será calculado o Fator K em seus dois modos o modo da UL e o modo que é assumido por muito autores como sendo o Fator K normalizado. . Esse estudo está diretamente relacionado com a temperatura de funcionamento do transformador e sua vida útil. Para exemplificar o estudo será mostrada a constituição do transformador a seco fabricado pela empresa SIEMENS, que recebe o nome de GEAFOL.
ARTICULO COMPLETO
http://www.lume.ufrgs.br/bitstream/handle/10183/65619/000864745.pdf?sequence=1