Synthetic ester oil based high permittivity CaCu&lt;inf&gt;3&lt;/inf&gt;Ti&lt;inf&gt;4&lt;/inf&gt;O&lt;inf&gt;12&lt;/inf&gt; (CCTO) nanofluids an alternative insulating medium for power transformer

Thomas, P.; Hudedmani, Nandini E; Prasath, R. T. Arun Ram; Roy, Nirmal Kumar; Mahato, Sankar Narayan

doi:10.1109/tdei.2018.007728

Cited by 35 publications

(23 citation statements)

References 20 publications

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“…Roy et al [140] mixed SE USEO with CCTO nanoparticles at concentrations 0.005 vol%, 0.1 vol%, and 0.05 vol%. The results of this experiment showed contrary values in comparison with the mentioned experiments carried out by Thomas et al [138]. AC-BDV was decreased by 35.8% at the highest examined concentration and by 24.7% at the lowest one.…”

Section: Ccto Nanoparticlescontrasting

confidence: 97%

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Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

2021

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This review is focused on the research of dielectric fluids, especially commonly used power transformer oils enhanced by nanoparticles, i.e., nanofluids. There are differences between various combinations of base fluids and nanoparticles prepared in different ways. The main goal of this review was to present recent research in this field sorted by the used nanoparticles. Nanofluids based on mineral oils, natural, or synthetic esters were investigated in terms of the nature of nanoparticles, particularly Al2O3, TiO2, Fe2O3, Fe3O4, graphene, fullerene, and others. The combinations of environmentally friendly oils and nanoparticles were presented. Finally, the article focused on the description of current dielectric fluids usable in power transformers and the possibilities of improving new and existing fluids with nanoparticles, especially their physical, dielectric, and chemical properties, but with regard to environmental aspects.

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Section: Ccto Nanoparticlescontrasting

confidence: 97%

“…Thomas et al [138] undertook study on CCTO (CaCu 3 Ti 4 O 12 ) nanoparticles mixed with SE MIDEL7131. Concentrations of CCTO in SE were 0.001-0.05 vol%.…”

Section: Ccto Nanoparticlesmentioning

confidence: 99%

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

2021

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“…Based on the mean AC BDV data, it has been shown that adding semi-conducting SiC NPs to the matrix improves the mean AC BDV, with NF2 having the highest maximization, and that doubling the NP's loading decreases the AC BDV. Many other published studies in the field [11][12][13]22,34,47] have discovered a similar pattern. The influence of these semi-conductive carbide NPs on the increase of AC BDV up to an optimal concentration can be explained by the fact that the NPs up to this weight percentage ratio could boost the shallow trap density in the NF, causing streamer propagation to be delayed due to electron trapping and de-trapping in shallow traps [30][31][32][33].…”

Section: Discussionsupporting

confidence: 67%

“…In contrast to the mineral oils used conventionally, natural ester oils (NEO) are characterized by unique and preferable properties from the industry side, such as rapid biodegradability, high moisture tolerance, less flammability and increased lifetime in comparison to mineral oils [8][9][10][11][12]. Apart from that, their higher relative permittivity is also very important, as it can match that of solid insulation in order to limit electric stress in high loading situations [13].…”

Section: Introductionmentioning

confidence: 99%

Breakdown Performance and Partial Discharge Development in Transformer Oil-Based Metal Carbide Nanofluids

et al. 2022

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In this work, the influence of semi-conductive SiC nanoparticles on the AC breakdown voltage and partial discharge development in natural ester oil FR3 is examined. Primarily, the dielectric constant and the electrical conductivity of the nanoparticles are measured following the broadband dielectric spectroscopy technique. The nanoparticles are added into the matrix following the ultrasonication process in three weight percentage ratios in order for their effect to be evaluated as a function of their concentration inside the base oil. The processing of the results reveals that the nanofluid containing SiC nanoparticles at 0.004% w/w demonstrates the highest AC dielectric strength improvement and shows the greatest resistance to the appearance of partial discharge activity. The mechanisms behind the aforementioned results are discussed in detail and confirmed by the broadband dielectric spectroscopy technique, which reveals that this particular nanofluid sample is characterized by lower dielectric constant and electrical conductivity than the one with double the weight percentage ratio.

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“…For the enhancement in thermal properties, only special types could enhance the thermal properties of natural ester oils. In [16], using CaCu 3 Ti 4 O 12 nanoparticles at a concentration of 0.05 vol% could enhance the thermal conductivity for synthetic ester about 10% and 9% at room temperature and 80 °C, respectively. Molybdenum disulfide (MoS 2 ) and h-BN nanoparticles were also used either as individual type or as hybrid together to enhance the thermal conductivity for several commercially-type natural esters [17].…”

Section: Introductionmentioning

confidence: 97%

Investigation of the Effect of Sonication Time on Dispersion Stability, Dielectric Properties, and Heat Transfer of Graphene Based Green Nanofluids

et al. 2021

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Natural ester oils are the current target of many industries and electrical utilities as electrically insulating fluids to replace the conventional mineral oils. However, previously investigated most natural ester oils are based on edible products, causing a negative impact on the food crisis. Accordingly, nonedible green nanofluids based on cottonseed oil have been targeted in the present study. Additive graphene nanoparticles (0.0015 wt%, 0.003 wt%, 0.006 wt%, and 0.01 wt%) along with surfactant sodium dodecylbenzene sulfonate (SDBS) were used (1:1) due to their promising impact on dielectric and thermal properties. Experimental methods introduced were including characterization of graphene and preparation of dielectric nanofluids (DNFs). The main concern for any nanofluid to be usable in transformer applications is its long-term stability. The effect of various ultrasonication period (10, 20, 30 and 60minute) on short-term stability of nanofluids was preliminary investigated by visual inspection, highest short-term stability was obtained at 30-min and 60-min. Considering short-term stability results, the two most stable samples were investigated and compared for long-term stability through Ultraviolet visible (UV-Vis) spectroscopy to find the suitable ultrasonication time. In addition, dielectric and thermal properties of these samples were investigated and compared. Physical mechanisms were discussed for the obtained enhancements considering the effect of ultrasonication period on the number of dispersed nanoparticle sheets per unit volume and the corresponding effect on dielectric and thermal properties.

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Synthetic ester oil based high permittivity CaCu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf> (CCTO) nanofluids an alternative insulating medium for power transformer

Cited by 35 publications

References 20 publications

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

Breakdown Performance and Partial Discharge Development in Transformer Oil-Based Metal Carbide Nanofluids

Investigation of the Effect of Sonication Time on Dispersion Stability, Dielectric Properties, and Heat Transfer of Graphene Based Green Nanofluids

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