Abrasive properties of transformer oil-based magnetic nanofluid

Bucko, Samuel; Krchňák, Martin; Cimbala, Roman; Kruzelak, Lukas; Zbojovský, Ján

doi:10.1109/epe.2018.8396038

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Initially, the magnetic NFs were fabricated using iron oxide which revealed enrichment in the dielectric as well as thermal strength [32]. The nature of insulating liquid can be polar or non-polar and both showing improvements in their properties with the dispersion of NPs at the optimum concentrations [33]. Various NPs including magnetic, metallic, semi-conductive, and insulative nature are used with different insulating mediums to improve the quality of insulants.…”

Section: A Background Of Nanofluidmentioning

confidence: 99%

Dielectric Performance of Magneto-Nanofluids for Advancing Oil-Immersed Power Transformer

Hussain

Khan

et al. 2020

IEEE Access

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Recently, nanofluids are introduced in the power utilities for the dielectric performance enhancement of power transformer oil. The compactness and fault improvement of the power transformers has resulted in the necessity of next-generation insulating fluid with inflated dielectric properties. This paper investigates the dielectric performance of the novel ester oil-based magnetic nanofluids with different nanoparticles under different electric stress conditions. Two biodegradable fluids used as the base liquid for the experiment are synthetic ester oil and natural ester oil while three magnetic nanoparticles used to synthesize nanofluids are iron (II, III) oxide, cobalt (II, III) oxide, and iron phosphide. The concentrations of the nanoparticles are varied to optimize the characteristics of the prepared nanofluids. The dielectric breakdown and relative permittivity of the nanofluids have been experimentally investigated. Further, the breakdown predictions have been performed using Weibull statistical distribution-based regression analysis. The experimental results show the improvement in the characteristics of prepared nanofluids with the change in nanoparticle concentration as compared with the host fluids.

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Section: A Background Of Nanofluidmentioning

confidence: 99%

Dielectric Performance of Magneto-Nanofluids for Advancing Oil-Immersed Power Transformer

Hussain

Khan

et al. 2020

IEEE Access

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“…Zhou et al [17] compared the AC and DC breakdown voltage and the space charge distribution of pressboard samples impregnated with a TiO based NF and mineral oil-impregnated pressboard. Other authors evaluated the mechanical properties of the cellulose and its ageing process when impregnated with NFs [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Response of the Oil-Paper Insulation System in Nanofluid-Based Transformers

2021

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The interest in developing and testing dielectric nanofluids for electrotechnical purposes has increased significantly in the last ten years. A number of works have been published reporting dielectric and thermal properties for these liquids that enhance those of conventional insulating fluids. Some authors propose that the application of dielectric nanofluids to transformer insulation could improve the reliability of transformers and open new possibilities for transformer design. However, this will not be feasible until thorough studies on the interaction of these materials with other elements of the transformer, specially the solid insulation, are carried out. In this work, the effect of the presence of nanoparticles on the dielectric response of oil and oil-paper insulation is analysed in laboratory conditions. Specimens have been prepared to emulate the insulation system of transformers and the dielectric response in the frequency domain of these specimens has been characterized. The dependence of nanoparticle concentration on the dielectric response has been analysed. Proposing physical mechanisms that explain the experimental results observed over the oil and the paper samples. Some conclusions are extracted in this work that may be of interest if nanofluids are considered as liquid insulation for transformers.INDEX TERMS Dielectric response, nanofluid, nanodielectric, nanoparticles, transformer insulation, complex capacitance, FDS, Fe 3 O 4

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“…Cimbala et al (2017) investigated the thermal degradation of ferrite NF-paper insulation, concluding that NF-impregnated paper insulation offers better long term moisture resistance than normal paper improving its life expectancy. In a further work (Bucko et al, 2018) the authors analyzed how the abrasive properties of NFs can affect the cellulose ageing process; the authors found that the presence of magnetic NPs might alter the cellulose structure, creating conductive channels during the ageing process that can worsen the paper insulating properties.…”

Section: Introductionmentioning

confidence: 99%

Morphological analysis of transformer Kraft paper impregnated with dielectric nanofluids

et al. 2020

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The use of dielectric nanofluids has been recently proposed as a method to improve the insulation system of transformers. It has been widely reported that these liquids present superior dielectric properties than conventional dielectric liquids and have a better behavior as cooling agents. Nevertheless some aspects need to be addressed before these materials are applicable to real equipment. This paper analyzes the interaction between dielectric nanofluids and the cellulose materials that constitute the solid insulation of transformers. The impregnation process of a transformer has been emulated in order to obtain samples of solid insulation impregnated with a Fe 3 O 4 based nanofluid. The samples have been subjected to ICP testing and Cryo-SEM observation, complemented with the determination of the EDX sprectrum. The interaction between the nanoparticles and the cellulose fibers has been investigated finding that bonds are established between them when cellulose is impregnated with nanofluids.

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Abrasive properties of transformer oil-based magnetic nanofluid

Cited by 4 publications

References 6 publications

Dielectric Performance of Magneto-Nanofluids for Advancing Oil-Immersed Power Transformer

Dielectric Performance of Magneto-Nanofluids for Advancing Oil-Immersed Power Transformer

Dielectric Response of the Oil-Paper Insulation System in Nanofluid-Based Transformers

Morphological analysis of transformer Kraft paper impregnated with dielectric nanofluids

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