Electromagnetic–Structural Finite Element Analysis of Copper and Aluminum Windings in Power Transformers under Short-Circuit Conditions

Electromagnetic forces can lead to the structural failure of power transformers due to extreme loading conditions, vibration, and/or fatigue. Therefore, studying the nature and the magnitude of these forces is a key task in the design and failure analysis of such important equipment. Keeping this is...

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Bibliographic Details
Published in:Energies (Basel) 2024-08, Vol.17 (16), p.3994
Main Authors: Cornelius, Richard Gonçalves, Lenhard, Betina Luísa, Medeiros, Leonardo Hautrive, Fontoura, Herber Cuadro, Correa, Cristian Hans, Carraro, Rodinei, Beltrame, Rafael Concatto, dos Santos, Tiago, Marchesan, Tiago Bandeira, Bender, Vitor Cristiano
Format: Article
Language:English
Subjects:
Aluminum
Analysis
Design optimization
Electric transformers
electromagnetic forces
Electromagnetism
Finite element analysis
Finite element method
Magnetic fields
mechanical stresses
power transformers
short-circuit conditions
Stress analysis
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Summary:Electromagnetic forces can lead to the structural failure of power transformers due to extreme loading conditions, vibration, and/or fatigue. Therefore, studying the nature and the magnitude of these forces is a key task in the design and failure analysis of such important equipment. Keeping this issue in mind, this work aims at conducting a numerical analysis in order to evaluate the mechanical stresses and displacements of windings in power transformers due to the action of electromagnetic forces. With this purpose, a finite element model is developed considering electromagnetic and mechanical effects assuming short-circuit conditions. The study compares the cases employing copper and aluminum windings with header tap, in different temperatures. The model developed in this work is verified against analytical solutions. The numerical calculations allow for performing a detailed analysis in terms of the distribution of both displacements and stresses along the windings, which is of great relevance for identifying critical structural points and avoiding structural failure. Overall, the obtained results demonstrate that the finite element model is a useful tool for the structural design of power transformers that allow for investigating and optimizing key aspects before manufacturing.
ISSN:1996-1073
1996-1073
DOI:10.3390/en17163994