Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging

Fernández, Inmaculada; Valiente, Rafael; Fernández, Federico; Estébanez, Carlos Javier Renedo; Ortiz, Alfredo

doi:10.3390/nano10040692

Cited by 40 publications

(30 citation statements)

References 36 publications

(48 reference statements)

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“…As it is a step by step synthesis method, the nanoparticle preparation and nanofluid synthesis are not done concurrently, hence it may undergo serious effects on its stability due to agglomeration in case of excess particle loading. Most of the researches optimises its particle loading at first and then utilises some major dispersion techniques like surface modification, mechanical stirring and ultrasound agitation to ensure a stable nanofluid [6, 9, 19, 20, 30, 45].…”

Section: Titania Nanofluid Synthesis – Key Componentsmentioning

confidence: 99%

“…for different particle sizes, to improve its essential attributes like dielectric BD strength and thermal conductivity [6][7][8][9][10][11][12][13][14]. The studies further progressed with the different particle morphology [15], insulation oils [16][17][18][19][20][21], voltage profiles, electrode configurations and partial discharge investigations [22][23][24][25][26][27][28][29][30]. Jin et al [7] observed the enhanced AC BD strength in silica nanoparticles dispersed MO, and proposed a mechanism that the hydrophilic nature of the particle surface adsorbs the moisture from MO which has the large influence on its BD characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Madavan and Balaraman [19] optimised the particle loading in nanofluids prepared with SiO 2 , Fe 3 O 4 and ZnO nanoparticles in MO and natural esters like sunflower oil and rapeseed oil, and the 0.25 volume fraction of conductive Fe 3 O 4 nanoparticles found to have the superior performance characteristics in all the cases. Fernández et al [20] evaluated the dielectric characteristics of the TiO 2 and ZnO dispersed vegetable oil which was subjected to accelerated ageing, and stated that the particles may act as hotspots to promote the thermal degradation of the oil, which was understood from the increased values of ageing indicators like dissipation factor, acidity and resistivity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

Raja¹,

Koperundevi²

2020

IET Nanodielectrics

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Section: Titania Nanofluid Synthesis – Key Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

Raja¹,

Koperundevi²

2020

IET Nanodielectrics

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“…In [10], three different types of nanoparticles were used with natural ester oil, Fe [11]. In [12], TiO 2 and ZnO nanoparticles were also used with natural ester. The percentage enhancement in BDV with TiO 2 nanoparticles attained about 33% at a concentration of 0.04 wt%, while the percentage enhancement with ZnO nanoparticles attained about 26% at a concentration of 0.04 wt%.…”

Section: Introductionmentioning

confidence: 99%

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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confidence: 99%

Effect of moisture and sonication time on dielectric strength and heat transfer performance of transformer oil based Al2O3 nanofluid

Babu¹,

Kumar²,

Babu³

2021

IJATEE

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Power transformer's role is very much critical in transmission and distribution of electricity to the consumers from power stations. The insulating liquid is crucial to the performance of the transformer [1]. Transformers expose to various stresses like thermal, electric, and chemical during their operation. Periodical check-ups and maintenance of insulating oil in the transformer are very much required to prevent sudden failure [2]. One of the most detrimental elements to transformer paper and oil insulation is moisture. It weakens the dielectric and lowers the partial discharge (PD) inception voltage, affects the electrical characteristics [3]. Aging and external causes are the two most important variables that encourage moisture intrusion in transformers. The moisture equilibrium characteristics of oil and paper insulation are well-known and broadly applied to estimate how much moisture is involved. *Author for correspondence Oil, on the other hand, can loses its insulating properties if it is polluted by moisture, particles, or a combination of the two [4]. Moisture contamination is thought to happen when voltage load taps are changed, allowing moisture and gases to absorb. The deterioration of the paper insulation between the transformer windings causes particle pollution [5].Transformers are built to withstand large loads, such as emergency and cold load pickup circumstances. As the load on the transformer grows, the internal temperature rises which in turn reduces the transformer's typical life expectancy. This process might take anything from months to years. Characteristics of a good cooling liquid include high thermal conductivity, low viscosity, high specific heat, high dielectric strength (in case of direct liquid cooling), high surface tension, chemical inertness, chemical stability, low freezing point, and melting points, and low cost. Insulating liquids need to retain their electrical and thermo-physical properties for a long time [6]. But in practice, after using those oils for a long time they lose their properties. In order to

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Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging

Cited by 40 publications

References 36 publications

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

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

Effect of moisture and sonication time on dielectric strength and heat transfer performance of transformer oil based Al2O3 nanofluid

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