Characterization of high performance AIN nanoparticle-based transformer oil nanofluids

Liu, Donglin; Zhou, Yuanxiang; Yang, Ying; Zhang, Ling; Fu, Jin

doi:10.1109/tdei.2016.7736835

Cited by 56 publications

(73 citation statements)

References 27 publications

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“…In the case of nanofluids' applications in transformers, the main research is related to the improvement of the dielectric properties of the base liquids. There are many publications confirming the positive influence of electro-insulating liquids' modifications, with nanomaterials on their dielectric properties and phenomena such as breakdown voltage [40][41][42][43], streamer propagation [44], electrical conductivity, and the dissipation factor [45][46][47][48][49]. In addition, as reported in the literature [50,51], fullerene C 60 can also be used to absorb free radicals arising from the aging of vegetable oils.…”

Section: Introductionmentioning

confidence: 88%

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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Section: Introductionmentioning

confidence: 88%

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

2018

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“…These dielectric properties and other such as dissipation factor, dielectric constant or electrical resistivity have been studied by many authors [58,59], analysing the effect of different nanoparticles (CaCu 3 Ti 4 O 12 , TiO 2 , Al 2 O 3 ). The streamers in transformer oils under lightning impulse voltage have been observed, too by authors such as et al [60,61], Cavallini et al [62], Sima et al [63] and Liu et al [64] or simulated as Velasco et al [65]. The last ones not only evaluated dielectric properties, but also thermal conductivity of nanofluids obtained through the dispersion of AlN nanoparticles.…”

Section: Accelerated Thermal Ageing In Laboratorymentioning

confidence: 97%

“…The last ones not only evaluated dielectric properties, but also thermal conductivity of nanofluids obtained through the dispersion of AlN nanoparticles. The effect of nanoparticles on heat transfer characteristics was also studied by Guan et al [64] and Morega et al [66]. The last ones additionally evaluated the specific magnetisation of other nanofluid to open new venues in optimising conventional electrotechnic constructions or to design novel devices [67].…”

Section: Accelerated Thermal Ageing In Laboratorymentioning

confidence: 99%

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Fernández-Diego¹,

Fernández²,

Fernández³

et al. 2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Power transformers life is limited fundamentally by the insulation paper state, which can be analysed through different techniques such as furanic compound concentration, dissolved gases, methanol concentration, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, refractive index of cellulose fibres, degree of polymerisation or tensile strength. The two last techniques provide the best way to evaluate mechanical resistance of insulation paper. This chapter describes briefly the most remarkable studies about post-mortem assessment and thermal ageing tests in which mechanical properties are some of the characteristics evaluated to determine paper degradation. This work also gathers the main relationships developed until now to relate different by-products generated during transformer operation with loss of paper mechanical properties. Finally, this chapter defines the future approaches, which could be used to study paper degradation.

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“…The enhancement for other samples was 14% and 23% for semiconducting and conducting nanoparticles, respectively. Liu et al [108] conducted measurements of the AC BDV of AlN nanoparticles with a 40 nm diameter, dispersed in mineral oil with various concentrations. They found that AlN mineral oil nanofluids were stable at least six months.…”

Section: Other Nanoparticlesmentioning

confidence: 99%

Nanofluids in the Service of High Voltage Transformers: Breakdown Properties of Transformer Oils with Nanoparticles, a Review

2018

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The continuous development of electrical systems and high voltage transformers builds the need for looking for new insulating media or to improve the insulating properties of commercially available transformer oils (TO) by various modification techniques. One of these techniques is the modification of existing mineral oils by the addition of different types of nanoparticles in various concentrations. These types of materials, suspensions of nanoparticles called nanofluids, have found numerous applications in the energy industry, especially in heat exchanger systems and solar cells. Much research has been done on attempts to replace mineral oils (MO), which are harmful for the environment, with natural ester oils (NE), but to make this possible, it is necessary to improve the insulating properties of these oils, for example by adding nanoparticles. This paper presents an extensive overview of the insulating properties; including for AC, DC and the lightning impulse breakdown voltage; for both mineral and natural ester oils containing various type of nanoparticles (NP). It is presented that the use of nanofluids could improve the efficiency of existing high voltage infrastructures with a low financial cost.

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Characterization of high performance AIN nanoparticle-based transformer oil nanofluids

Cited by 56 publications

References 27 publications

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

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

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Nanofluids in the Service of High Voltage Transformers: Breakdown Properties of Transformer Oils with Nanoparticles, a Review

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