Modelos Termodinâmicos e Análise Tridimensional para Determinação de Limites de Carregamento de Transformadores (Thermodynamic models and three-dimensional analysis for determination of Load Limits Transformers)

Marcio Zamboti Fortes (mzf@vm.uff.br)1, Henrique Oliveira Henriques (rique@vm.uff.br)1, Carlos Eduardo Vizeu Pontes (carloseduardo.vizeu@light.com.br)2, Sergio Feitoza Costa (sergiofeitoza@cognitor.com.br)3, Mauricio Caldora Costa (mcosta@electromag.com)4, Jose Carlos O. Aires (jcaires@ajato.com.br)5


1Universidade Federal Fluminense
2LIGHT S.E.S.A
3COGNITOR
4ELETROMAGNETICS
5Universidade GAma Filho

This paper appears in: Revista IEEE América Latina

Publication Date: Sept. 2013
Volume: 11,   Issue: 5 
ISSN: 1548-0992


Abstract:
The power transformer thermal response related to a load curve can be verified by a tridimensional model using finite elements. This paper presents the modeling and the software developed for this purpose and compares the results with local tests data of two critical points ‑ the top of the oil and the winding hot spot. Using the technique described, the maximum load limit of power transformers can be determinated, and operation costs and system expansion can be analysed.

Index Terms:
transformers, overload,load limits   


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