Electrostatic properties of aged fullerene-doped mineral oil

Aksamit, P.; Zmarzły, D.; Boczar, T.

doi:10.1109/tdei.2011.6032816

Cited by 14 publications

(4 citation statements)

References 16 publications

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“…Table 1 presents some of dielectric properties of pure electro-insulating liquids and electro-insulating liquids admixed by nanoparticles. The doping of electro-insulating liquids with nanoparticles is aimed at improving such dielectric properties as electrical strength, resistivity, dielectric loss, permittivity [17][18][19][20][21][22][23][24][25][26][27]. Table 1.…”

Section: Introductionmentioning

confidence: 99%

Electro-Insulating Nanofluids Based on Synthetic Ester and TiO2 or C60 Nanoparticles in Power Transformer

Nadolny

Dombek

2018

Energies

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The article discusses thermal properties of synthetic ester admixed with nanoparticles. The analyzed thermal properties were: thermal conductivity λ, kinematic viscosity υ, density ρ, specific heat cp, and the thermal expansion factor β- all obtained by means of measurements. On the basis of these, the authors calculated the heat transfer factor α, which determines the ability of the liquid to heat transport. The authors used nanoparticles of fullerene C60 and titanium oxide TiO2. The analysis of the thermal properties was done for the temperatures of 25, 40, 60 and 80 °C. The authors analyzed the impact of nanoparticles C60 and TiO2 on thermal properties of synthetic ester. They proved that fullerene C60 in principle had no influence on heat transfer factor α of the ester, while titanium oxide TiO2 had some positive influence on the factor, the value of which increased about 1–3%.

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Section: Introductionmentioning

confidence: 99%

Electro-Insulating Nanofluids Based on Synthetic Ester and TiO2 or C60 Nanoparticles in Power Transformer

Nadolny

Dombek

2018

Energies

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“…The concentration of fullerene C 60 in the base liquids was 0.1 g•L −1 , which corresponds to the concentrations used to improve the dielectric properties of electro-insulating liquids [65,66]. Figure 2 presents a comparison of prepared samples based on fullerene C 60 with samples of base liquids.…”

Section: Preparation Of Nanofluids Based On Fullerene C 60mentioning

confidence: 99%

“…Analyzing the calculated temperature decreases, it can be concluded that the modification of electro-insulating liquids with fullerene C 60 does not significantly affect the heat transport in the obtained nanofluids. Bearing in mind that fullerene C 60 is mainly used to improve dielectric properties [65,66] and to absorb free radicals and to slow the acidification of vegetable oils [50,51], it can be concluded that it does not impair the cooling efficiency of the device. Table 6 presents measured values of the thermal properties of analyzed electro-insulating liquids and nanofluids based on surfactant Span ® 20 and titanium dioxide TiO 2 nanoparticles.…”

Section: Kind Of Liquidmentioning

confidence: 99%

Effects of Nanoparticles Materials on Heat Transfer in Electro-Insulating Liquids

2018

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This paper discusses the effect of doping of electro-insulating liquids with nanoparticle materials on the thermal properties of the obtained nanoliquids and heat transport in the transformer. Mineral oil, synthetic ester, and natural ester were used as base liquids. The effectiveness of doping base liquids with nanoparticles was supported by ultraviolet-visible (UV/VIS) measurements. In turn, Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) confirmed the absence of intermolecular interactions (i.e., hydrogen bonding). The influence of modification of electro-insulating liquids with fullerene C60 and titanium dioxide TiO2 nanoparticles on such thermal properties as thermal conductivity, specific heat, kinematic viscosity, density, and thermal expansion was investigated. Based on these properties and the theory of similarity, the cooling efficiency of the transformer filled with the analyzed nanofluids was determined. Nanofluids’ cooling effectiveness was compared with the cooling effectiveness of the base liquids. This comparison was supported by an analysis of Grashof, Prandtl, and Nusselt numbers. It has been shown that the modification of electro-insulating liquids with nanoparticles widely used in order to improve their dielectric properties, such as C60 and TiO2, does not have a significant influence on their thermal properties. The addition of fullerene C60 caused an increase in kinematic viscosity, which was compensated by the increase in specific heat. In the case of TiO2, the addition of this nanoparticle resulted in an increase in kinematic viscosity and a decrease in specific heat, which were balanced out by the increase in thermal conductivity. In summary, the heat exchange-capacity of liquids did not change due to doping with nanoparticles.

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“…Certainly, the definite relation between the electrification degree of oil flow and electrostatic current must be acquired before the calculation. That is to say, the mathematical expression of the relation between the electrification degree of oil flow and the electrostatic current must be researched [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Research on the Relation between Transformer Oil Flow Electrification and Electrostatic Current

Fu¹,

Wang²,

Zou³

et al. 2015

Journal of Electrical Engineering and Technology

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-In order to study and obtain the mathematical relation between the electrification degree of transformer oil flow and the electrostatic current, a small amount of data about the electrification degree of oil flow and the corresponding electrostatic current is studied by linear regression method and grey model method. The results show that the linear correlation between the electrification degree and the electrostatic current was not good, and the relation between the electrification degree of oil flow and electrostatic current (i) could be expressed as ρ (0) =0.2049 i (0) +169.4419 according to grey model GM (0, 2) when the electrification degree of oil flow is represented by the charge number generated from transformer oil per unit volume, namely the charge density (ρ).

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Electrostatic properties of aged fullerene-doped mineral oil

Cited by 14 publications

References 16 publications

Electro-Insulating Nanofluids Based on Synthetic Ester and TiO2 or C60 Nanoparticles in Power Transformer

Electro-Insulating Nanofluids Based on Synthetic Ester and TiO2 or C60 Nanoparticles in Power Transformer

Effects of Nanoparticles Materials on Heat Transfer in Electro-Insulating Liquids

Research on the Relation between Transformer Oil Flow Electrification and Electrostatic Current

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