Magnetic Nanofluid Applications in Electrical Engineering

Pîslaru‐Dănescu, Lucian; Morega, Alexandru M.; Ţelipan, Gabriela; Morega, Mihaela; Dumitru, J. B.; Marinescu, Virgil

doi:10.1109/tmag.2013.2271607

Cited by 45 publications

(37 citation statements)

References 27 publications

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“…Both numerical simulations as well as laboratory measurements [65][66][67] confirm the following aspects: about the usage of a magnetic nanofluid MNF/UTR 40 as cooling and insulating fluid for transformers, this provides for magnetization body forces that add to the thermal, gravitational forces. In the vertical layout of the transformer, these forces act concurrently with the thermal flow, and the overall effect is the enhancement of the heat transferred from the aggregate active parts (core and windings) to the ambient.…”

Section: 2mentioning

confidence: 68%

“…This essentially means a lower hot spot temperature by approximately 10°in this model and a more uniform temperature distribution. These results suggest that the vertical design of the low-power mono-phased transformer (40 kVA), at medium voltage (30/√3//0,4/√3kV) prototype TMOf 2-36kV-40kVA ( Figure 15) may be advisable [66,67]. This prototype TMOf 2-36kV-40kVA realized in compliance with the constructive solutions with characteristics specific for the aimed purpose presents the following advantages: reduced weight and dimensions in comparison with the current power transformers that have the same rated voltage and rated power, following the intensification of the cooling effect in the presence of the specific nanofluid MNF/UTR 40 ( Figure 15b).…”

Section: 2mentioning

confidence: 99%

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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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Section: 2mentioning

confidence: 68%

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

Self Cite

View full text Add to dashboard Cite

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“…The effect of nanoparticles on heat transfer characteristics was also studied by Guan et al [64] and Morega et al [66]. The last ones additionally evaluated the specific magnetisation of other nanofluid to open new venues in optimising conventional electrotechnic constructions or to design novel devices [67]. Creeping discharge and flashover characteristics of the oil/pressboard interface under AC and impulse voltages was studied by Lv et al for a nanofluid based on TiO 2 nanoparticles [68], obtaining an increase of the shallow trap density and a lower shallow trap energy level of oil-impregnated pressboard which can improve the creeping flashover strength of oil/pressboard interface.…”

Section: Accelerated Thermal Ageing In Laboratorymentioning

confidence: 99%

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Fernández-Diego¹,

Fernández²,

Fernández³

et al. 2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Power transformers life is limited fundamentally by the insulation paper state, which can be analysed through different techniques such as furanic compound concentration, dissolved gases, methanol concentration, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, refractive index of cellulose fibres, degree of polymerisation or tensile strength. The two last techniques provide the best way to evaluate mechanical resistance of insulation paper. This chapter describes briefly the most remarkable studies about post-mortem assessment and thermal ageing tests in which mechanical properties are some of the characteristics evaluated to determine paper degradation. This work also gathers the main relationships developed until now to relate different by-products generated during transformer operation with loss of paper mechanical properties. Finally, this chapter defines the future approaches, which could be used to study paper degradation.

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“…The cavity formed in the housing is filled with superparamagnetic colloidal nanofluid, NMF-UTR40-500G, Figure 21, having saturation magnetization of 500 Gs, [27]. The applications presented in [28,29], uses a dilution of magnetic nanofluid acting also as a cooling agent, type NMF-UTR40-50G that having saturation magnetization of 50 Gs. Figure 21.…”

Section: Making a Miniature Planar Microtransformers With Circular Spmentioning

confidence: 99%

“…Magnetic nanofluids used as the core liquid in the micro-electric transformer obtained by coprecipitation method [27,35], is a colloidal suspension of nanoparticles of magnetite ( the synthesis procedure for obtaining magnetic nanofluids based on non-polar organic liquids are indicated in [28][29][30]35]. To be used as a transformer fluid core, magnetic nanofluid requires good colloidal stability and features adapted to the operating conditions and materials it is in contact with.…”

Section: Magnetic Nanofluids Used For Planar Microtransformers With Cmentioning

confidence: 99%

New Energy Harvesting Systems Based on New Materials

Pîslaru‐Dănescu¹,

Constantin²

2018

Advanced Electronic Circuits - Principles, Architectures and Applications on Emerging Technologies

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This study starts with the ZnO nanostructured materials used for improve the efficiency of polycrystalline solar cells operation under low solar radiation conditions. The ZnO nanowires were prepared using the hydrothermal method of deposition on the seed layer by a new and complex process, with controllable morphological and optical properties. The analysis of the XRD patterns, scanning electron microscopy images (SEM) of the ZnO nanowires and a lot of tests made Pasan Meyer Burger HighLight 3 solar simulator, confirm the advantages of using the ZnO nanowires in solar cells applications for antireflection coatings. Then, piezoelectric structures based on new modified PZT zirconate titanate designed for energy harvesting applications is presented. Based on their piezoelectric characteristics, modified PZT zirconate titanate ceramics made of Pb (Zr 0.53 Ti 0.47 ) 0.99 Nb 0.01 O 3 ceramic have efficient applications in energy harvesting devices. A piezoelectric transducer, consisting of a thin plate of this piezoceramic material, with dimensions (34 mm Â 14 mm Â 1 mm), is illustrated. A multiphysics numerical simulation further illustrates such piezoelectric transducer operation. Finally, the miniature planar transformer with circular spiral winding and hybrid core-ferrite and magnetic nanofluid, designed for new energy harvesting systems is presented. We purpose now that the magnetic nanofluid be used both as a coolant and as part of the hybrid magnetic core.

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Magnetic Nanofluid Applications in Electrical Engineering

Cited by 45 publications

References 27 publications

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

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

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

New Energy Harvesting Systems Based on New Materials

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