Effect of semiconductive nanoparticles on insulating performances of transformer oil

Du, Yali; Lv, Yuzhen; Li, Chengrong; Chen, Mutian; Zhong, Yuxiang; Zhou, Jianquan; Li, Xiaoxin; Zhou, You

doi:10.1109/tdei.2012.6215079

Cited by 199 publications

(37 citation statements)

References 14 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%

See 1 more Smart Citation

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%

“…Table 1. Dielectric properties of pure electro-insulating liquids and electro-insulating liquids admixed by nanoparticles [22][23][24][25][26][27]; MO-mineral oil, NE-natural ester.…”

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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“…[1][2][3] The insulation breakdown strength of transformer oil is closely related to its internal space charge. [4][5][6][7] To study the mechanism by which nanoparticles affect transformer oil, it is necessary to measure and compare the space charge distributions of the nano-modified transformer oils and pure transformer oil. The space charge distribution of transformer oil can be measured using the pulsed electroacoustic technique (PEA) under an applied DC voltage.…”

mentioning

confidence: 99%

Space charge inhibition effect of nano-Fe3O4 on improvement of impulse breakdown voltage of transformer oil based on improved Kerr optic measurements

Yang

Sima

et al. 2015

AIP Advances

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Transformer oil-based nanofluids (NFs) with 0.03 g/L Fe3O4 nanoparticle content exhibit 11.2% higher positive impulse breakdown voltage levels than pure transformer oils. To study the effects of the Fe3O4 nanoparticles on the space charge in transformer oil and to explain why the nano-modified transformer oil exhibits improved impulse breakdown voltage characteristics, the traditional Kerr electro-optic field mapping technique is improved by increasing the length of the parallel-plate electrodes and by using a photodetector array as a high light sensitivity device. The space charge distributions of pure transformer oil and of NFs containing Fe3O4 nanoparticles can be measured using the improved Kerr electro-optic field mapping technique. Test results indicate a significant reduction in space charge density in the transformer oil-based NFs with the Fe3O4 nanoparticles. The fast electrons are captured by the nanoparticles and are converted into slow-charged particles in the NFs, which then reduce the space charge density and result in a more uniform electric field distribution. Streamer propagation in the NFs is also obstructed, and the breakdown strengths of the NFs under impulse voltage conditions are also improved.

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“…[1][2][3] Studies have shown that the addition of nanoparticles will affect the insulation strength of a liquid dielectric. [4][5][6][7][8][9] Segal et al added magnetic nanoparticles into a transformer oil and enhanced the positive impulse breakdown voltage to nearly double its value under a needle-sphere electrode configuration. 4 Du et al dispersed semiconductor nanoparticles into transformer oil and the measured AC and lightning impulse breakdown voltage of the modified oil increased by 1.2 times compared with that of pure oil.…”

mentioning

confidence: 99%

“…4 Du et al dispersed semiconductor nanoparticles into transformer oil and the measured AC and lightning impulse breakdown voltage of the modified oil increased by 1.2 times compared with that of pure oil. [7][8][9] When a high voltage (HV) is applied, the nanoparticles will influence the distribution and transportation of the space charge in the liquid dielectric, thus affecting the discharge of liquid dielectric. To carry out further research, it is necessary to effectively measure its internal electric field and space charge distribution.…”

mentioning

confidence: 99%

Effect of Fe3O4 nanoparticles on space charge distribution in propylene carbonate under impulse voltage

Sima

Yang

et al. 2015

AIP Advances

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Addition of nanoparticles of the ferromagnetic material Fe3O4 can increase the positive impulse breakdown voltage of propylene carbonate by 11.65%. To further investigate the effect of ferromagnetic nanoparticles on the space charge distribution in the discharge process, the present work set up a Kerr electro-optic field mapping measurement system using an array photodetector to carry out time-continuous measurement of the electric field and space charge distribution in propylene carbonate before and after modification. Test results show that fast electrons can be captured by Fe3O4 nanoparticles and converted into relatively slow, negatively charged particles, inhibiting the generation and transportation of the space charge, especially the negative space charge.

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Effect of semiconductive nanoparticles on insulating performances of transformer oil

Cited by 199 publications

References 14 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

Space charge inhibition effect of nano-Fe3O4 on improvement of impulse breakdown voltage of transformer oil based on improved Kerr optic measurements

Effect of Fe3O4 nanoparticles on space charge distribution in propylene carbonate under impulse voltage

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