Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

Antonio Roniel Marques de Sousa, Marcus Vinicius Alves Nunes, Wellington da Silva Fonseca, Ramon Cristian Fernandes Araujo and Diorge de Souza Lima
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Antonio Roniel Marques de Sousa: Electrical Engineering Faculty, Institute of Technology, Federal University of Pará, Belém 66075-110, PA, Brazil
Marcus Vinicius Alves Nunes: Electrical Engineering Faculty, Institute of Technology, Federal University of Pará, Belém 66075-110, PA, Brazil
Wellington da Silva Fonseca: Electrical Engineering Faculty, Institute of Technology, Federal University of Pará, Belém 66075-110, PA, Brazil
Ramon Cristian Fernandes Araujo: Electrical Engineering Faculty, Institute of Technology, Federal University of Pará, Belém 66075-110, PA, Brazil
Diorge de Souza Lima: Electrical Engineering Faculty, Federal University of South and Southeast of Pará, Marabá 68507-590, PA, Brazil

Energies, 2021, vol. 14, issue 11, 1-19

Abstract: The main equipment responsible for connection and transmission of electric power from generating centers to consumers are power transformers. This type of equipment is subject to various types of faults that can affect its components, in some cases also compromising its operation and, consequently, the electric power supply. Thus, in this paper, electromagnetic, thermal, and structural analysis of power transformers was carried out with the objective of providing the operator with information on the ideal moment for performing predictive maintenance, avoiding unplanned shutdowns. For this, computational simulations were performed using the finite element method (FEM) and, from that, the different transformer operation ways, nominal currents, inrush current, and short-circuit current were analyzed. In this perspective, analyses of the effects that thermal expansion, axial forces, and radial forces exerted were carried out, contributing to possible defects in this type of equipment. As a study object, simulations were carried out on a 50 MVA single-phase transformer. It is important to emphasize that the simulations were validated with real data of measurements and with results presented in the current literature.

Keywords: multiphysics analysis; finite elements; transformer; inrush current; fault current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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