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Open AccessArticle

Computation of Stray Losses in Transformer Bushing Regions Considering Harmonics in the Load Current

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Programa de Maestría y Doctorado en Ingeniería, especialidad en Sistemas Eléctricos de Potencia Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
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Posgrado en Eléctrica, Tecnológico Nacional de México, Instituto Tecnológico de Morelia, Morelia 58120, Mexico
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Departmento de Energía, Universidad Autónoma Metropolitana Azcapotzalco, Ciudad de México 02200, Mexico
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Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(10), 3527; https://doi.org/10.3390/app10103527
Received: 10 April 2020 / Revised: 13 May 2020 / Accepted: 18 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Power Quality in Electrical Power Systems)
The presence of harmonics in the load current considerably increases stray losses in electric transformers. In this research paper, a new model for computing the electromagnetic field (EMF) and eddy current (EC) losses in transformer tank covers is derived considering harmonics. Maxwell’s equations are solved with their corresponding boundary conditions. The differential equation thus obtained is solved using the method of separation of variables. The obtained expressions do not require the use of special functions, accommodating them for practical implementation in the industry. The obtained formulas are evaluated for different spectrum contents of the load current and losses. The results are in good agreement with simulations carried out using the Altair Flux finite element (FE) software. View Full-Text
Keywords: eddy currents; electromagnetic fields; finite element analysis; harmonic distortion; transformer tank wall eddy currents; electromagnetic fields; finite element analysis; harmonic distortion; transformer tank wall
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MDPI and ACS Style

Khan, S.; Maximov, S.; Escarela-Perez, R.; Olivares-Galvan, J.C.; Melgoza-Vazquez, E.; Lopez-Garcia, I. Computation of Stray Losses in Transformer Bushing Regions Considering Harmonics in the Load Current. Appl. Sci. 2020, 10, 3527.

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