Prototyping a Ferrofluid-Cooled Transformer

“…The magnetic fluid has magnetic properties of magnetic nanoparticles and fluidity of carrier fluid [1,2]. Magnetic fluids are characterized by higher heat transfer and the ability to use external magnetic field to create forced circulation [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermal Field in Mineral Transformer Oil Based Magnetic Fluids

et al. 2017

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“…The heat transfer and transport processes under the influence of the magnetic field for two prototypes electric transformer: low power mono-phased transformer (24 kVA), at medium voltage (20/√3//0,4/√3kV), TMOf-24-5 and low power mono-phased transformer (40 kVA), at medium voltage (30/√3//0,4/√3kV), prototype TMOf 2-36kV-40 kVA, are described by the following set of coupled partial differential equations [44]:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Figure 17. Magnetic cores and the core rolling device [44]. a finned metallic tank constituted from two parts air-proof assembled through a soldering that is soft and capable of elastic deformation for the taking-over of the variation with temperature of the cooling liquid volume ( Figure 19).…”

Section: 2mentioning

confidence: 99%

Nanofluid with Colloidal Magnetic Fe3O4 Nanoparticles and Its Applications in Electrical Engineering

Pîslaru‐Dănescu¹,

Ţelipan²,

Stoian³

et al. 2017

Nanofluid Heat and Mass Transfer in Engineering Problems

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In this study, we propose a new type of a cooling agent based on magnetic nanofluid for the purpose of replacing the classical cooling fluids in electrical power transformers. The magnetite (Fe 3 O 4 ) nanoparticles were synthesized by the co-precipitation method from an aqueous medium of salts FeCl 3 x6H 2 O and FeSO 4 x7H 2 O in the molar ratio Fe 3+ /Fe 2+ = 2:1, by alkalization with 10% aqueous solution of NaOH at 80°C, for 1 h. The size of the magnetite nanoparticles, as measured by X-ray diffraction method, was 14 nm and by scanning electron microscopy (SEM), they are between 10 and 30 nm. Magnetite powder was placed in oleic acid as a surfactant to prevent agglomeration of nanoparticles. The resulting mixture was dispersed in transformer oil UTR 40, with the role of carrier liquid. The magnetic, rheological, thermal and electrical characteristic properties of the obtained Fe 3 O 4 transformer oil-based nanofluid were determined. A mathematical model and numerical simulation results are very useful for investigating the heat transfer performances of the magnetic nanofluid. Based on this study, it was tested the cooling performance of this magnetic nanofluid for two types of electrical power transformers as compared to classical methods. We also presented a microactuator based on the same magnetic nanofluid.

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“…The MF has improved electric, mechanical and thermal properties and it has the fluidity of base fluid [1][2][3][4]. MF are characterized by the ability to use external electric or magnetic field to create fluid movement [5][6][7]. Recently these fluids have been in the state of research in the use as an insulating alternative over mineral oils in power transformers.…”

Section: Introductionmentioning

confidence: 99%

Variation of Magnetic Fluid Deformation Related to Nanoparticle Concentration in Steady Electric Field

et al. 2018

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Today, it is important to know the behaviour of magnetic fluids applied in the power electrical machines, e.g. in power transformers, when exposed to an electric field. Besides their promising applications in high voltage engineering, they are of increasing interest from designed assembly and pattern formation point of view. The structure of such magnetic fluids is easily controllable by external magnetic fields. However, less attention has been paid to structural phenomena in magnetic fluids induced by electric fields. The core of this paper is dedicated to the experimental observation of a magnetic fluid droplet deformation in a steady electric field. The mutual relation between the deformation parameter and magnetic nanoparticles concentration is analysed. Spatio-temporal analysis of the droplet shape is presented in the paper. The phenomena of the droplet deformation were recorded by a camera. The detailed experimental procedure is presented. The method of deformation parameter calculation based on the linear pixel as the smallest-size unit in digital image is written. Finally, the relation between the deformation parameter and the nanoparticle volume concentration, as well as the time and magnitude of the DC field application are thoroughly evaluated. The results show that the deformation parameter decreases with increasing concentration at constant applied steady electric field but increases with increasing applied steady electric field.

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Prototyping a Ferrofluid-Cooled Transformer

Cited by 39 publications

References 4 publications

Analysis of Thermal Field in Mineral Transformer Oil Based Magnetic Fluids

Analysis of Thermal Field in Mineral Transformer Oil Based Magnetic Fluids

Nanofluid with Colloidal Magnetic Fe3O4 Nanoparticles and Its Applications in Electrical Engineering

Variation of Magnetic Fluid Deformation Related to Nanoparticle Concentration in Steady Electric Field

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