Published

2015-06-01

Core influence on the frequency response analysis (FRA) of power transformers through the finite element method

Influencia del núcleo en el análisis de respuesta en frecuencia (FRA) en transformadores de potencia mediante el método de elementos finitos

DOI:

https://doi.org/10.15446/ing.investig.v35n1Sup.53771

Keywords:

Frequency response analysis (FRA), magnetic core, finite element method (FEM), transformer windings, complex permeability. (en)
Análisis de respuesta en frecuencia (FRA), núcleos magnéticos, método de elementos finitos (MEF), devanado de transformadores, permeabilidad compleja. (es)

Downloads

Authors

  • David Leonardo Alvarez Alvarez Ph.D, Student, Universidad Nacional de Colombia, Bogotá, Colombia https://orcid.org/0000-0003-2188-2498
  • Javier Alveiro Rosero Garcia Associate Professor, Universidad Nacional de Colombia, Colombia. Research Group: Electrical Machines & Drives Group, EM&D.
  • Enrique Esteban Mombello Lecturer and Researcher, Instituto de Energía Eléc­trica, CONICET - Universidad Nacional de San Juan, Argentina.
In this paper the influence of core parameters in Frequency Response Analysis is analyzed through the equivalent circuit impedance matrix of the transformer winding; the parameters of the circuit have been computed using the Finite Element Method. In order to appreciate the behavior of the iron core in comparison to the air core, the frequency dependence of resonances is calculated to show how the air core only influences the results at low frequencies. The core is modeled using a complex permeability, and the parameters of conductivity and permeability are varied to show their influence in the resonances, which turned out to be negligible. In order to explain this behavior, the eigenvalues of the inverse impedance matrix are calculated showing that they are similar for different values of conductivity and permeability. Finally, the magnetic flux inside and outside the core and its influence in the frequency response is studied.

En este artículo se analiza la influencia de los parámetros del núcleo en el Análisis de Respuesta en Frecuencia, a través de la matriz de impedancias del circuito equivalente de devanados de trasformadores, donde el cálculo de parámetros del circuito se realiza mediante el método de elementos finitos. Con el fin de analizar el comportamiento entre núcleos de aire y núcleos magnéticos, se calcula la dependencia en la frecuencia de las resonancias, mostrando que el núcleo de aire solo influencia las resonancias a bajas frecuencias. El núcleo del transformador se modela por medio de permeabilidades complejas, donde se varían la conductividad y permeabilidad, obteniendo como resultado una influencia despreciable de estos parámetros sobre las resonancias. Con el fin de explicar este fenómeno, los eigenvalores de la matriz inversa de impedancias son calculados, obteniendo una matriz similar para los diferentes valores de conductividad y permeabilidad. Finalmente, se estudia el flujo magnético dentro y fuera del núcleo, y su influencia en la respuesta en frecuencia.

Dimensions

PlumX

Article abstract page views

1260

Downloads

Download data is not yet available.

How to Cite

Alvarez Alvarez, D. L., Rosero Garcia, J. A., & Mombello, E. E. (2015). Core influence on the frequency response analysis (FRA) of power transformers through the finite element method. Ingeniería E Investigación, 35(1Sup), 110-117. https://doi.org/10.15446/ing.investig.v35n1Sup.53771
Crossref
Scopus
Google Scholar
Europe PMC

License

Copyright (c) 2015 David Leonardo Alvarez Alvarez, Javier Alveiro Rosero Garcia, Enrique Esteban Mombello

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

The authors or holders of the copyright for each article hereby confer exclusive, limited and free authorization on the Universidad Nacional de Colombia's journal Ingeniería e Investigación concerning the aforementioned article which, once it has been evaluated and approved, will be submitted for publication, in line with the following items:

1.    The version which has been corrected according to the evaluators' suggestions will be remitted and it will be made clear whether the aforementioned article is an unedited document regarding which the rights to be authorized are held and total responsibility will be assumed by the authors for the content of the work being submitted to Ingeniería e Investigación, the Universidad Nacional de Colombia and third-parties;

2.    The authorization conferred on the journal will come into force from the date on which it is included in the respective volume and issue of Ingeniería e Investigación in the Open Journal Systems and on the journal's main page (https://revistas.unal.edu.co/index.php/ingeinv), as well as in different databases and indices in which the publication is indexed;

3.    The authors authorize the Universidad Nacional de Colombia's journal Ingeniería e Investigación to publish the document in whatever required format (printed, digital, electronic or whatsoever known or yet to be discovered form) and authorize Ingeniería e Investigación to include the work in any indices and/or search engines deemed necessary for promoting its diffusion;

4.    The authors accept that such authorization is given free of charge and they, therefore, waive any right to receive remuneration from the publication, distribution, public communication and any use whatsoever referred to in the terms of this authorization.