Thermal Analysis of Power Transformers with Different Cooling Systems Using Computational Fluid Dynamics

Nogueira, Gabriel C.; Medeiros, Leonardo H.; Oliveira, Micael M.; Barth, Norton D.; Bender, Vitor C.; Marchesan, Tiago Bandeira; Falcão, Carlos Eduardo Guex

doi:10.1007/s40313-021-00848-0

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…The remaining life of the transformer is studied, estimated by analysis of insoluble gas in petroleum and gas chromatography [7]. Another work performs thermal studies through the application of Computational Fluid Dynamics (CFD) for prototype transformers, which is considering six different cooling configurations [8]. Life estimation for oil immersion and distribution transformers is performed by considering weather-dependent intelligent load models and unbalanced loads [9].…”

Section: Introductionmentioning

confidence: 99%

Fe₃O₄/TiO₂/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers

Saravanakumar

Issac

Dhanaselvam

et al. 2022

J. Phys.: Conf. Ser.

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The actual lifetime of a transformer is between 30-50 years, while a foundation can be in service for 100 years. The aim of this research is to get the exact remaining lifetime of the transformers and to suggest a method to improve it. Hybrid nanoparticles are used to improve the thermal properties and dielectric strength of transformer oil. Titanium oxide (TiO2), Iron oxide (Fe3O4), and Graphene is used in specific concentration to prepare the hybrid nanoparticles. Energy Dispersive X-Ray Analysis (EDX), X-Ray Diffraction Analysis (XRD), Fourier Transform Infrared Spectroscopy (FTIR) are carried out to know whether the nanoparticles are properly synthesized. Initially Infrared thermography analysis using Fluke TiX-580 is being carried out to measure the surface temperature of the transformers and transformers under analysis are grouped. Nanofluid Transformer oil is prepared and Break Down Voltage (BDV) Test is taken to analyse the strength. Transformers are filled with nanofluid transformer oil and Infrared Thermography analysis is performed again to analyse the surface temperature. It is showing that lifetime of transformers is increased from 6 to 8% after using nanofluid transformer oil.

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Section: Introductionmentioning

confidence: 99%

Fe₃O₄/TiO₂/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers

Saravanakumar

Issac

Dhanaselvam

et al. 2022

J. Phys.: Conf. Ser.

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“…In the first decade, the main purpose of CFD was to determine the velocity and temperature profiles of a 2-D winding immersed in a mineral oil, [2][3][4][5][6][7]. More recently, the improvement of computational resources has enabled the use of 3-D models to conduct numerical investigations, allowing to capture three-dimensional phenomena that are impossible to find in 2-D models, [8][9][10][11][12]. These works model fluids and solids in the transformer, using the Conjugate Heat Transfer (CHT) model for the fluid-solid interface coupling.…”

Section: Introductionmentioning

confidence: 99%

CFD study of the impact of the deviation on the mass flow inlet on winding hot-spot temperature of a power transformer using mineral and ester oils

Santisteban

Fernández

Köseoğlu

et al. 2022

2022 IEEE 21st International Conference on Dielectric Liquids (ICDL)

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This work presents a study where a deviation on the mass flow rate in adjacent sectors of the winding is considered. A CFD model was developed for this study, where heat transfer between sectors is enabled due to the lack of thermal symmetry, and the goal of this study is to determine whether this effect can be neglected or not. To carry out this study, a Low Voltage Winding of a 100 MVA power transformer was selected. This transformer has been manufactured and tested by BEST Transformers, and the results obtained from the heat run test were used to validate the CFD model. The study also considered an alternative dielectric liquid, natural ester, in order to estimate if the different thermal and hydraulic conditions can affect to the relevance of the studied effect. The CFD simulations have been carried out with ANSYS Fluent. The results showed a deviation of 3-4% of the heat dissipated due to the non-symmetric conditions with a 10% of mass flow deviation, which is the heat transfer between the adjacent sectors. This effect is identical when considering mineral oil or natural ester. The results shows there is a small impact of the winding temperatures due to this effect, and that it can be considered negligible.

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“…Para auxiliar no projeto térmico de transformadores, ferramentas, como modelos termo-hidráulicos e simulações computacionais da dinâmica dos fluidos (CFD), têm sido empregadas (Radakovic et al 2012;Nogueira et al 2021;Chi et al 2022). Fazendo uso dessas técnicas é possível obter a distribuição da vazão de óleo e as temperaturas ao longo dos enrolamentos e dos radiadores a partir de dados construtivos e operacionais.…”

Section: Introductionunclassified

Análise do Comportamento Térmico de um Transformador de Potência Através do Uso de Sensoriamento por Fibras Ópticas

Medeiros

Oliveira

Kaminski

et al. 2022

Proceedings IX Simpósio Brasileiro De Sistemas Elétricos

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Power transformers are essential equipments for the proper functioning of the electrical power system. Therefore, there is a need to provide solutions that extend their useful life and monitoring methods to avoid failures and consequently losses to electrical companies. This work presents a series of tests carried out in a prototype transformer built specifically for the purpose of studying the internal thermal behavior, using optical fibers to obtain the direct measurement of the winding temperatures. Thus, analysis of thermal phenomena that occur under different operating conditions are presented, discussing these phenomena from the perspective of temperature rise and loss of life, aiming to reconcile theory with the actual behavior of a transformer, suggesting adequate operating conditions, and also serving as a basis for future thermal studies in power transformers.Resumo: Transformadores de potência são equipamentos essenciais para o funcionamento adequado do sistema elétrico. Portanto, existe a necessidade de apresentar soluções que prolonguem sua vida útil e métodos de monitoramento para evitar falhas e consequentemente prejuízos às concessionárias. O presente trabalho apresenta uma série de ensaios realizados em um transformador protótipo construído especificamente para estudar o comportamento térmico interno. Foram empregadas fibras ópticas para obter a medição direta da temperatura nos enrolamentos. Dessa forma, são apresentadas análises dos fenômenos térmicos que ocorrem para diversas condições operativas, discutindo acerca desses fenômenos sob a perspectiva da elevação de temperatura e perda de vida útil, visando conciliar teoria com o comportamento real de um transformador, sugerindo condições de operação adequadas e, também, servindo de base para futuros estudos térmicos em transformadores.

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Thermal Analysis of Power Transformers with Different Cooling Systems Using Computational Fluid Dynamics

Cited by 6 publications

References 22 publications

Fe₃O₄/TiO₂/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers

Fe₃O₄/TiO₂/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers

CFD study of the impact of the deviation on the mass flow inlet on winding hot-spot temperature of a power transformer using mineral and ester oils

Análise do Comportamento Térmico de um Transformador de Potência Através do Uso de Sensoriamento por Fibras Ópticas

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Thermal Analysis of Power Transformers with Different Cooling Systems Using Computational Fluid Dynamics

Cited by 6 publications

References 22 publications

Fe3O4/TiO2/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers

Fe3O4/TiO2/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers

CFD study of the impact of the deviation on the mass flow inlet on winding hot-spot temperature of a power transformer using mineral and ester oils

Análise do Comportamento Térmico de um Transformador de Potência Através do Uso de Sensoriamento por Fibras Ópticas

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Product

Resources

About

Fe₃O₄/TiO₂/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers

Fe₃O₄/TiO₂/Graphene Hybrid Nanocomposite to Improve the Lifespan of Distribution Transformers