Statistical Investigation of Lightning Impulse Breakdown Voltage of Natural and Synthetic Ester Oils-Based Fe3O4, Al2O3and SiO2Nanofluids

Béroual, Abderrahmane; Khaled, Usama

doi:10.1109/access.2020.3003246

Cited by 26 publications

(30 citation statements)

References 24 publications

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“…The improvement is of about 25.6% with Fe 3 O 4 at a concentration of 0.05 g/L; 22% with SiO 2 at a concentration of 0.3 g/L; and 18.3% with Al 2 O 3 at a concentration of 0.3 g/L. For natural esters, the best improvements of the U50% value of LI-BDV are approximately 7.5% with Fe 3 O 4 at a concentration of 0.2 g/L; 16.8% with Al 2 O 3 at a concentration of 0.05 g/L; and 13% of SiO 2 at a concentration of 0.2 g/L [117,118].…”

Section: Influence Of Nanoparticles On the Breakdown Voltage Of Synthetic Estes-based Nanofluidsmentioning

confidence: 90%

“…The nanoparticles have generally had a beneficial effect on the LI-BDV of esters. So, Li et al [116] [117,118]. The improvement is of about 25.6% with Fe 3 O 4 at a concentration of 0.05 g/L; 22% with SiO 2 at a concentration of 0.3 g/L; and 18.3% with Al 2 O 3 at a concentration of 0.3 g/L.…”

Section: Influence Of Nanoparticles On the Breakdown Voltage Of Synthetic Estes-based Nanofluidsmentioning

confidence: 96%

“…Note that LI-BDV of pure synthetic esters and natural esters is more that about twice that of BDV at AC stress [117]. By measuring the AC as well as the positive and negative LI breakdown voltages of vegetable oil-based ZnO nanofluids at different particle concentrations, Chen et al [119] observed improvements of BDV, these voltages are of 30.2%, 24.6% and 5.5%, respectively.…”

Section: Influence Of Nanoparticles On the Breakdown Voltage Of Synthetic Estes-based Nanofluidsmentioning

confidence: 99%

“…According to Beroual and Khaled [46,117], the improvement in the BDV of NP-based esters may be due to (1) the electron trap sites which nanoparticles create around the electrodes by reducing the electron number and consequently by increasing the streamer initiation voltage, thus leading to an increase in the breakdown voltage; and (2) by reducing the number of electrons which move towards the opposite electrode, resulting in an accumulation of electrons at the nanoparticle-surrounding liquid interfaces, thus forming the so-called double layer, and thereby slowing down the propagation of the streamers leading to the breakdown. When the double layer is saturated, the excess electrons will no longer be trapped; they will contribute to the propagation/acceleration of the streamers and thus lead to the reduction of the BDV.…”

Section: Processes Involved In Breakdown Voltage Mechanisms Of Synthetic Esters-based Nanofluidsmentioning

confidence: 99%

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A Review on Synthetic Ester Liquids for Transformer Applications

et al. 2020

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Synthetic esters have become more and more popular in last few decades, explaining the increasing number of units filled with this liquid year by year. They have been investigated under different aspects, both from the fundamental point of view and breakdown mechanisms, well as from the application point of view. However, their use in high voltage equipment is always a challenge and deeper knowledge of the various aspects that can be encountered in their exploitation is needed. The intent of this review paper is to present the recent research progress on synthetic ester liquid in relation to the selected issues, most important for ester development in the authors’ opinion. The described issues are the breakdown performance of synthetic esters, lightning impulse strength and pre-breakdown phenomena of synthetic esters, synthetic esters-based nanofluids, combined paper-synthetic ester based insulating systems, application of synthetic ester for retro-filling and drying of mineral oil-immersed transformers, DGA(dissolved gas analysis)-based diagnosis of synthetic esters filled transformers as well as static electrification of synthetic esters. The different sections are based both on the data available in the literature, but above all on the authors’ own experience from their research work on synthetic ester liquids for electrical application purposes.

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Section: Influence Of Nanoparticles On the Breakdown Voltage Of Synthetic Estes-based Nanofluidsmentioning

confidence: 90%

Section: Influence Of Nanoparticles On the Breakdown Voltage Of Synthetic Estes-based Nanofluidsmentioning

confidence: 96%

Section: Influence Of Nanoparticles On the Breakdown Voltage Of Synthetic Estes-based Nanofluidsmentioning

confidence: 99%

Section: Processes Involved In Breakdown Voltage Mechanisms Of Synthetic Esters-based Nanofluidsmentioning

confidence: 99%

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A Review on Synthetic Ester Liquids for Transformer Applications

et al. 2020

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“…The most common method to assess nanofluid stability is using visual examination and light scattering techniques. In exploration of natural ester-based nanofluids as dielectrics, [96] uses statistical analysis for lightning impulse voltage for natural and synthetic ester oils-based Fe3O4, Al2O3, and SiO2 Nanofluids. It recommends the use of natural ester-based Nano fluids for liquid filled transformers.…”

Section: Two-step Methodsmentioning

confidence: 99%

Alternative liquid dielectrics in power transformer insulation: a review

Tlhabologo

Samikannu

Mosalaosi

2021

IJEECS

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Transformer liquid dielectrics evolved where mineral oil has been the dominant choice until emergence of synthetic esters and natural esters. Natural ester-based oils have been under extensive investigations to enhance their properties for replacing petroleum-based mineral oil, which is non-biodegradable and has poor dielectric properties. This paper focuses on exposition of natural ester oil application in mixed transformer liquid dielectrics. Physical, chemical, electrical, and ageing characteristics of these dielectrics and the dissolved gas analysis (DGA) were reviewed. Physical properties include viscosity, pour point, flash and fire point which are vital indicators of heat insulation and fire risk. Chemical properties considered are water content, acid number, DGA, corrosive sulphur, and sludge content to limit and detect degradation and corrosion due to oil ageing. Electrical properties including breakdown voltage were considered for consistent insulation during overload and fault conditions. These properties of evolving alternative dielectrics were reviewed based on ASTM International standards and International Electro technical Commission standards for acceptable transformer liquid dielectrics. This review paper was compiled to avail modern methodologies for both the industry and scholars, also providing the significance of using mixed dielectrics for power transformers as they are concluded to show superiority over non-mixed dielectrics.

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