AC breakdown voltage and viscosity of mineral oil based fullerene nanofluids

Jin, Huifei; Andritsch, Thomas; Morshuis, P.H.F.; Smit, J.J.

doi:10.1109/ceidp.2013.6748151

Cited by 21 publications

(23 citation statements)

References 14 publications

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Section: Discussionsupporting

confidence: 73%

“…Additionally similar results were obtained with titania in a mineral base [39]. According to the more spread theory [40,41], the capacity to improve this parameter is due to the capacity of nanoparticles to capture and to slow down the electrons rising during the ionization of oil under electric fields. These free electrons promote the development of streamers once launched, reducing the capacity of the dielectric oils to withstand voltages; that is, their isolating capacity.…”

Section: Discussionsupporting

confidence: 70%

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Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

et al. 2020

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The assessment of a TiO2 vegetal-based dielectric nanofluid has been carried out, and its characteristics and behavior have been tested and compared with a previously tested maghemite nanofluid. The results obtained reflect a similar affectation of the main properties, with a maximal improvement of the breakdown voltage of 33% at 0.5 kg/m3, keeping the thermal conductivity and the viscosity almost constant, especially the first one. This thermal characterization agrees with the results obtained when applying the TiO2 optimal nanofluid in the cooling of an experimental setup, with a slightly worse performance than the base fluid. Nevertheless, this performance is the opposite to that noticed with the ferrofluid, which was capable of improving the cooling of the transformer and decreasing its temperature. The similarities between the characterizations of both nanofluids, the differences in their cooling performances and their different magnetic natures seem to point out the presence of additional thermomagnetic buoyancy forces to support the improvement of the cooling.

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Section: Discussionsupporting

confidence: 73%

Section: Discussionsupporting

confidence: 70%

Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

et al. 2020

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“…Jin et al [67] measured the AC breakdown voltage of pure mineral oil and corresponding fullerene nanofluids with concentration of 0.05% and 0.1% in accordance with IEC 60156 standard. The improvement in AC breakdown voltage was 19% for 0.05% fullerene concentration and 34% for 0.1% fullerene concentration as compared to oil.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Rafiq

2016

Journal of Nanomaterials

133

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The mineral oil or synthetic oil in conjunction with paper is mainly being applied as dielectric medium in many of the high voltage apparatus. However, the advent of high voltage levels such high voltage alternating current (HVAC) and high voltage direct current (HVDC) has prompted researchers to direct their focus onto an insulation system which can bear the rising high voltage levels. The modern insulating liquid material development is guided by various factors such as high electrical insulation requirements and other safety and economic considerations. Therefore transformer manufacturer companies have to design transformers with these new specific requirements. The transformer oil-based nanofluids with improved dielectric and thermal properties have the potential to replace mineral oil base products in the market place. They are favorable because they function more superior than mineral oil and they contribute definite insulating and thermal gains. This paper reviews recent status of nanofluids use as transformer oils. The nanofluids used as transformer oils are presented and their advantages are described in comparison with mineral oil. The multiple experimental works carried out by different researchers are described, providing an overview of the current research conducted on nanofluids. In addition scope and challenges being confronted in this area of research are clearly presented.

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“…In previous work it was shown that nanofluids with untreated nanoscale silica have a higher AC breakdown strength than mineral oil at high moisture content [3]. The AC breakdown of mineral oil is very dependent on the moisture content, but to a lesser extent for silica nanofluids.…”

Section: Introductionmentioning

confidence: 99%

The effect of surface treatment of silica nanoparticles on the breakdown strength of mineral oil

Jin

Morshuis

Smit

et al. 2014

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)

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Abstract-In previous work, the results of AC breakdown tests showed that unmodified silica nanoparticles improve the breakdown strength of mineral oil based nanofluids, especially at a relatively high humidity level of around 25 ppm. It was proposed that, since the hydrophilic surface of unmodified silica nanoparticles can absorb water, this would lead to a reduction of free moisture in the bulk of the oil, which has a strong influence on the breakdown strength. In the present study this proposition is verified, by comparing the breakdown strength of two mineral oil based nanofluids: a reference with unmodified silica nanofluid and a nanofluid with Z-6011 modified silica. The silane coupling agent Z-6011 turns the surface of silica nanoparticles hydrophobic, thus preventing water adsorption.

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AC breakdown voltage and viscosity of mineral oil based fullerene nanofluids

Cited by 21 publications

References 14 publications

Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

The effect of surface treatment of silica nanoparticles on the breakdown strength of mineral oil

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