UPS ESTATICO PARTE1 Por Luís Tossi e Lincolm Menezes REVISTA OSETOR ELETRICO

http://www.osetoreletrico.com.br/web/documentos/fasciculos/Ed89_fasc_UPS_estatico_cap6.pdf

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