Dielectric Properties of Vegetable Oils

Shah, Zaheer Hussain; Tahir, Q. A

doi:10.3329/jsr.v3i3.7049

Cited by 100 publications

(47 citation statements)

References 13 publications

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“…A característica de biodegradabilidade, alto ponto de fulgor (> 300 °C) e a possibilidade de aumentar a vida útil do papel isolante, são os pontos mais relevantes que podem ser abordados (Fofana et al, 2010). Diversos autores vêm reportando exemplos do uso de óleos vegetais como óleo isolante aplicado em transformadores de distribuição de energia, tais como óleo de palma, canola e oliva (Essam & Al-Ammar, 2010), óleo de milho e algodão (Shah & Tahir, 2011 Com base no exposto considera-se imprescindível caracterizar óleos vegetais disponíveis no Brasil, no sentido de se chegar a alternativas viáveis uma vez que, em regra, materiais comerciais apresentam segredos de preparação. Assim, o objetivo do trabalho é apresentar os resultados da investigação de características físico-químicas e dielétricas dos óleos de algodão, babaçu, girassol, milho e soja da classe comestível.…”

Section: Introductionunclassified

Caracterização físico-química e dielétrica de óleos biodegradáveis para transformadores elétricos

Silva

Carvalho²,

Conrado³

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M OO óleo mineral, originário do petróleo, é o fluido isolante tradicionalmente utilizado em transformadores elétricos. Diante do apelo por fontes de energia limpa e renovável o setor elétrico também é pressionado a apresentar alternativas ao fluido de origem fóssil. Neste estudo, óleos de algodão, babaçu, girassol, milho e soja, foram avaliados quanto ao seu potencial para utilização como fluido dielétrico. As propriedades avaliadas foram densidade, viscosidade, acidez, tensão de ruptura, fator de perda, teor de água e corrosividade. Os resultados obtidos foram comparados aos limites estabelecidos na NBR 15422. Os óleos vegetais apresentaram densidade e viscosidade dentro dos limites recomendados; além disso, não se mostraram corrosivos mas devem ser submetidos a tratamentos específicos que os conduzam a atender outras especificações; o tratamento dos óleos com solução de hidróxido de sódio diminuiu a acidez, melhorou a tensão de ruptura e diminuiu o fator de perda. Palavras-chave: óleo mineral, óleo isolante vegetal, transformadorPhysico-chemical and dielectric characterization of biodegradable oils for electric transformers A B ST R A C T The mineral oil, originated from petroleum, is the insulating fluid traditionally used in electrical transformers. Responding to appeals for clean and renewable energy sources, the electrical sector is also under pressure to present alternatives to the fluid of fossil origin. In this study, cotton, `babassu', sunflower, corn and soybean oils were evaluated for their potential of utilization as a dielectric fluid. The properties investigated were density, viscosity, acidity, breakdown voltage, loss factor, water content and corrosivity. The results were compared with the values of the limits established in NBR 15422. Vegetable oils showed density and viscosity within the limits set by standard, however, higher than those presented by the studied mineral oil. It was found that vegetable oils have to pass through improvements to meet other specifications required. The treatment of oils with sodium hydroxide solution reduced the acidity, improved the breakdown voltage thereby lowering the loss factor.

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Section: Introductionunclassified

Caracterização físico-química e dielétrica de óleos biodegradáveis para transformadores elétricos

Silva

Carvalho²,

Conrado³

et al. 2012

Rev. bras. eng. agríc. ambient.

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“…The relative permittivity of the mineral oil was only 2.15. The difference in relative permittivity was observed mainly due to the fact that different insulating liquids have different moisture contents, polarities, and dipole polarization (Lison et al, ; Shah and Q a, ; Zech et al, ). Rajab et al () and Wang () demonstrated that there is a correlation between the degree of polarity and relative permittivity.…”

Section: Resultsmentioning

confidence: 99%

Effects of Molecular Structure on the Physical, Chemical, and Electrical Properties of Ester‐Based Transformer Insulating Liquids

Raof

Yunus

Rashid

et al. 2019

J Americ Oil Chem Soc

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This article presents the experimental studies carried out on the environmental friendly polyol ester insulating liquids to investigate the effect of molecular structure on the physical, chemical, and electrical properties. Six different polyol esters that can be produced from the transesterification of various methyl esters with neopentylglycol/trimethylolpropane alcohols were synthesized and compared with those of refined, bleached, and deodorized palm oil (RBDPO) and mineral transformer oil. The finding suggests that the physical properties like fire point, pour point, and viscosity are very much affected by the molecular weight and molecular composition of the polyol esters. The electrical properties are also highly influenced by the molecular structure-related characteristics, such as the polarity, dipole polarization, carbon chain length, and degree of branching. The results confirm the findings of previous studies that the polyol esters and RBDPO have more polarity and dipole polarization compared to mineral oil. The experimental evidence showed that the newly synthesized insulating liquids have favorable thermal and electrical properties, thus suggesting that the insulating liquids have the potential to replace conventional insulating liquids to provide a more sustainable power system in the future.

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“…Vegetable plant based natural oils possess dielectric properties comparable or even better than hydrocarbon and mineral oil based dielectrics [20]. Many researchers have experimented with natural oils as dielectric fluid for power transformers and other electrical engineering applications [21,22].…”

Section: Introductionmentioning

confidence: 99%

Investigating Feasibility Through Performance Analysis of Green Dielectrics for Sustainable Electric Discharge Machining

Valaki

Rathod

2015

Materials and Manufacturing Processes

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This work represents a feasibility study for the newly proposed vegetable oil based green dielectric fluids, biodielectric1 (BD1) and biodielectric2 (BD2) for Electric discharge machining (EDM). Comparative analyses for BD1, BD2 and kerosene have been studied to assess the performance in terms of material removal Rate (MRR), electrode wear rate (EWR) and relative wear ratio (RWR) for P20+ cold worked plastic injection mould steel using electrolytic grade copper electrode. Current, Gap voltage, Pulse on time (T on ) andPulse off time (T off ), have been chosen as input parameters and one variable at a time approach has been used for designing experimental plan for investigating feasibility of the newly suggested fluids. The results obtained show that performance of the newly suggested biodielectrics BD1 and BD2 are better than commercially used hydrocarbon based dielectric i.e. Kerosene, for MRR and RWR. ANOVA results indicated that current is the most influencing parameter for MRR and EWR, while T on is the most significant parameter for RWR. Under the influence of current, BD1 and BD2 produced 38% and Downloaded by [New York University] at 00:10 02 August 2015 2165 % improvement in MRR respectively. Moreover, BD1 and BD2 resulted 30% higher and 7% lower RWR, respectively under the influence of T on.

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Dielectric Properties of Vegetable Oils

Cited by 100 publications

References 13 publications

Caracterização físico-química e dielétrica de óleos biodegradáveis para transformadores elétricos

Caracterização físico-química e dielétrica de óleos biodegradáveis para transformadores elétricos

Effects of Molecular Structure on the Physical, Chemical, and Electrical Properties of Ester‐Based Transformer Insulating Liquids

Investigating Feasibility Through Performance Analysis of Green Dielectrics for Sustainable Electric Discharge Machining

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