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Journal articles on the topic 'Dielectric oils'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Shah, Z. H., and Q. A. Tahir. "Dielectric Properties of Vegetable Oils." Journal of Scientific Research 3, no. 3 (2011): 481–92. http://dx.doi.org/10.3329/jsr.v3i3.7049.

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In search of PCB (polychlorinated biphenyl) free mineral oil used in transformer, we have carried out the detailed study on dielectric properties of some vegetable oils, such as corn oil and cottonseed oil. Dielectric constant, dielectric loss factor have been determined for corn oil, cotton seed oil, and PCB free mineral transformer oil having International Electrotechnical Commission number IEC-60296 in the frequency range 330 Hz to 3 MHz and in temperature range 250C to 700C. The dielectric data of the vegetable oils is critically compared with that of the transformer oil and appropriate ca

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2

Pecovska Gjorgjevich, Margareta, Aleksandar Andonovski, and Julijana Velevska. "Dielectric constant and induced dipole moment of edible oils subjected to conventional heating." Macedonian Journal of Chemistry and Chemical Engineering 31, no. 2 (2012): 285. http://dx.doi.org/10.20450/mjcce.2012.19.

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The frequency dependence of dielectric constant, dielectric loss factor and conductivity are studied for five edible oils in the frequency range 100 kHz to 13 MHz at different temperatures using frequency domain spectroscopy. The dielectric constant is found similar for all the samples and in agreement with the previous reports. The dielectric loss is low (<0.01) except for the virgin olive oil with value of 0.05. Dielectric loss peak frequency is at 4 MHz for corn oil and around 5.2 MHz for the others. At this frequency conductivity is of the order of 10-7-10-9 S/cm, and decreases with tem

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3

Singaravel, Balasubramaniyan, K. Chandra Shekar, G. Gowtham Reddy, and S. Deva Prasad. "Performance Analysis of Vegetable Oil as Dielectric Fluid in Electric Discharge Machining Process of Inconel 800." Materials Science Forum 978 (February 2020): 77–83. http://dx.doi.org/10.4028/www.scientific.net/msf.978.77.

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Electric discharge machining (EDM) is a spark erosion process widely used to machine difficult-to-cut material by conventional machining method. The major elements of EDM process are work piece, electrode and dielectric fluid. In this work, an attempt is made to investigate vegetable oil as dielectric fluid and their process performance for machining of Inconel 800 in EDM process. The effects of dielectric fluids are investigated with vegetable oils and conventional dielectric fluid namely Sunflower oil and Kerosene respectively. The important input variables considered in this study are pulse

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4

Khan, Mohammad Shafi, Vishal Singh Chandel, and Satyendra Pratap Singh. "Comparative Dielectric Study of Binary Mixtures of Coriandar oil and Radish oil." Oriental Journal Of Chemistry 37, no. 2 (2021): 308–13. http://dx.doi.org/10.13005/ojc/370207.

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The present paper deals with the dielectric study (dielectric constant, dielectric loss) of two medicinal oils, coriandar and radish oil and their binary mixtures at different temperatures and frequencies. HP 4194A impedance gain/phase analyzer and temperature controller (Julabo, model number F-25, microprocessor controlled) were used for determination of dielectric parameters and maintaining the temperature of pure oils their binary mixtures.

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5

Zainoddin, Muhamad Hafiy Syazwan, Hidayat Zainuddin, and Aminudin Aman. "Dielectrophoresis Effect of Dielectric Liquids with Suspended Cellulose Impurities under DC Electric Field." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 6 (2017): 3254. http://dx.doi.org/10.11591/ijece.v7i6.pp3254-3261.

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For decades, petroleum-based mineral oils are the insulating media conventionally used in the industry, particularly for high voltage (HV) applications. However, due to the disadvantages of mineral oils, there is growing interest in replacing these oils with environmentally friendly alternatives in order to fulfill the demanding requirements of dielectric liquids. One of the promising substitutes for mineral oils is ester oils. Nevertheless, the implementation of ester oils is not widespread compared with mineral oils due to the lack of understanding on the performance of ester oils in HV appl

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6

Šegatin, Nataša, Tanja Pajk Žontar, and Nataša Poklar Ulrih. "Dielectric Properties and Dipole Moment of Edible Oils Subjected to ‘Frying’ Thermal Treatment." Foods 9, no. 7 (2020): 900. http://dx.doi.org/10.3390/foods9070900.

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The dielectric properties of six refined edible oils with different fatty-acid compositions were determined for oils incubated at 180 °C up to 40 h. The oil degradation was evaluated by the dielectric dispersion and dielectric loss in the frequency range from 40 Hz to 2 MHz at 25 °C, refractive index, density, saponification number, and specific absorption coefficient at 232 and 268 nm. The dependence of the dielectric properties on frequency has been evaluated with Corach, Cole–Cole, and the universal power law models, giving the novel strategies for the interpretation of the dielectric spect

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7

Wahid, Siti Sufiah Abd, Mohd Fikri Hilmi Mohd Taib, Yanuar Z. Arief, et al. "Experimental Investigation on Vegetative Oils under Accelerated Thermal Ageing against Their Dielectric Strength." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 3 (2017): 1588. http://dx.doi.org/10.11591/ijece.v7i3.pp1588-1593.

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Insulation is one of the most important parts in high voltage apparatus such as power transformer. Most power transformer use liquid insulation material, known as power transformer oil. Petroleum-based oil so called mineral oil has been used for many years as power transformer oil. This is due to its high dielectric field strength, low dielectric loses and good long-term performance. This research work has been carried out to investigate the effect of thermal accelerated ageing on electrical properties for several vegetative-based oils. The oil samples that have been used in this research work

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8

Sugatov, Nikolay, and Anvar Ashatovich Khaziev. "Study of Dielectric and Physicochemical Parameters Dependencies in Engine Oils during Exploitation." Applied Mechanics and Materials 838 (June 2016): 71–77. http://dx.doi.org/10.4028/www.scientific.net/amm.838.71.

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9

Agaev, S. G., A. A. Baida, O. V. Georgiev, O. O. Maiorova, and A. G. Mozyrev. "Dielectric Spectroscopy of Vegetable Oils." Russian Journal of Applied Chemistry 93, no. 5 (2020): 748–56. http://dx.doi.org/10.1134/s107042722005016x.

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10

Prasad, D., and S. Chandrasekar. "EFFECT OF NANO-SiO2 PARTICLES ON PARTIAL DISCHARGE SIGNAL CHARACTERISTICS OF FR3 TRANSFORMER OIL." JOURNAL OF ADVANCES IN CHEMISTRY 13 (February 7, 2017): 6208–17. http://dx.doi.org/10.24297/jac.v13i0.5687.

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Liquid insulation for high voltage transformer applications based on natural esters derived from abundantly available vegetable oils are becoming popular in recent times. Since these natural ester based oils have environmental advantages and superior thermal performance, electrical utilities are slowly replacing the conventional mineral oils with natural ester based vegetable oils. FR3 oil, which is a soya based natural ester oil with superior dielectric and thermal characteristics, is becoming popular as an alternate insulating medium for high voltage transformers. With recent developments in

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11

Lyutikova, M. N., S. M. Korobeynikov, and A. A. Konovalov. "Electrophysical properties of mixtures of mineral oil and synthetic ester dielectric liquid." Safety and Reliability of Power Industry 14, no. 2 (2021): 132–41. http://dx.doi.org/10.24223/1999-5555-2021-14-2-132-141.

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Power transformers are key equipment in power generation, transmission, and distribution systems. The reliability of power transformers is based on the performance of the insulation system, which includes solid cellulose insulation and a liquid dielectric. Modern power engineering requires liquid insulation to have excellent insulating properties, high fire resistance, and biodegradability. Mineral oil that has been in use for over 100 years does not meet certain requirements. Therefore, various methods of enhancing the insulating properties of the oil are currently being considered, including

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12

Carcedo, Juan, Inmaculada Fernández, Alfredo Ortiz, Fernando Delgado, Carlos J. Renedo, and Carmen Pesquera. "Aging assessment of dielectric vegetable oils." IEEE Electrical Insulation Magazine 31, no. 6 (2015): 13–21. http://dx.doi.org/10.1109/mei.2015.7303258.

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13

Carioca, J. O. B., R. G. Correa, J. J. F. Hiluy, and S. J. Macambira. "Green dielectric oils; problems and perspectives." Journal of Biotechnology 150 (November 2010): 91. http://dx.doi.org/10.1016/j.jbiotec.2010.08.235.

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14

Farade, Rizwan A., Noor Izzri Abdul Wahab, Diaa-Eldin A. Mansour, et al. "Development of Graphene Oxide-Based Nonedible Cottonseed Nanofluids for Power Transformers." Materials 13, no. 11 (2020): 2569. http://dx.doi.org/10.3390/ma13112569.

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Sustainable materials, such as vegetable oils, have become an effective alternative for liquid dielectrics in power transformers. However, currently available vegetable oils for transformer application are extracted from edible products with a negative impact on food supply. So, it is proposed in this study to develop cottonseed oil (CSO) as an electrical insulating material and cooling medium in transformers. This development is performed in two stages. The first stage is to treat CSO with tertiary butylhydroquinone (TBHQ) antioxidants in order to enhance its oxidation stability. The second a

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15

Yahya, Muhammad bin, and Nurul Aifaa Najihah binti Maliki. "Identifying the Breakdown Voltages of Vegetable Oils with Silicone Carbide Nanoparticle Additive as Insulating Oil for Transformers." Indonesian Journal of Electrical Engineering and Computer Science 9, no. 1 (2018): 170. http://dx.doi.org/10.11591/ijeecs.v9.i1.pp170-176.

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This paper discusses on the breakdown voltage of vegetable oils with nanoparticles added to be used as insulating oil for transformers. Raw samples of Palm Oil (PO) and Coconut Oil (CO) were used in this research. Different percentages of silicone carbide (SiC) nanoparticles was added into the samples of the vegetable oils. The different parameters of the vegetable oil mixtures were investigated through the breakdown voltage tests to analyse the effect of the additive on the dielectric strength of the oils. The performance of insulating oils varies according to the percentage of nanoparticles

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16

Ab Ghani, Sharin, Zulkarnain Ahmad Noorden, Nor Asiah Muhamad, Hidayat Zainuddin, Muhammad Ilman Hakimi Chua Abdullah, and Imran Sutan Chairul. "Dielectric Strength Improvement of Natural Ester Insulation Oil via Mixed Antioxidants: Taguchi Approach." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 2 (2017): 650. http://dx.doi.org/10.11591/ijece.v7i2.pp650-658.

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<span lang="EN-US">Recently, natural ester insulation (NEI) oils are found to be the best candidates to replace mineral-based insulation oils for oil-immersed transformer applications. However, NEI oils are prone to oxidation due to their poor oxidative stability which can be improved by adding antioxidants into the oils. Latest studies have also shown that the use of selected antioxidants improves the AC breakdown voltage (BdV) of NEI oils. However, the experiments in previous studies were designed using the conventional one-factor-at-a-time (OFAT) method, which requires a large number

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17

Wiege, Berthold, Eberhard Fehling, Bertrand Matthäus, and Marcus Schmidt. "Changes in Physical and Chemical Properties of Thermally and Oxidatively Degraded Sunflower Oil and Palm Fat." Foods 9, no. 9 (2020): 1273. http://dx.doi.org/10.3390/foods9091273.

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Deep-fat frying is an important process used worldwide for the preparation of foods. Due to oxidation, hydrolysis, decomposition and oligomerization, numerous polar compounds are formed. These compounds change the physical, nutritional and sensory properties of the oil or fat. The standard methods of the German Society for Fat Science for the assessment of the quality of frying fats are time consuming and cost intensive. Therefore, alternative cost-effective and sensitive rapid methods, which ideally allow the quantitative determination of the quality of frying fats “in-line” in the deep-fryin

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18

O. A, Ezechukwu. "VEGETABLE OILS FOR HIGH VOLTAGE INSULATION BY." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 10, no. 4 (2013): 1553–62. http://dx.doi.org/10.24297/ijct.v10i4.3256.

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This paper discusses the findings of the study of the possibility of using some vegetable oils as high voltage insulation materials. Samples of palm oil (elaeis guineensis), palm kernel oil (elaeis guineensis), coconut oil (cocos nucifera), groundnut oil(Arachis hypogea) and local pear oil(dacryodes edulis) were obtained from Ekwulobia town, processed and tested. The results obtained showed exciting performance for palm oil, palm kernel oil and groundnut oil. Investigation on the dielectric strength of local pear oil (dacryodes eduli) is inconclusive because the sample collected was not suffic

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19

Aimi, A. H. Z., and N. Hussin. "Comparative Studies of Vegetable Oils as Transformer Insulating Oil." Applied Mechanics and Materials 679 (October 2014): 200–206. http://dx.doi.org/10.4028/www.scientific.net/amm.679.200.

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In general, transformer is one of the most important equipment in the power system, the reliability of a transformer is commonly determined by its insulation condition. The insulation liquid that has been used for decades is petroleum based mineral oil which has a very good cooling performance. However, it is insidious to the environment. Hence, vegetable oils such as coconut oil and palm oil are used as the alternative to replace the mineral oil. In this paper, it presents the comparative studies from previous experiments on dielectric strength, moisture content, viscosity, pour point and fla

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20

Tlhabologo, Bokang Agripa, Ravi Samikannu, and Modisa Mosalaosi. "Alternative liquid dielectrics in power transformer insulation: a review." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 3 (2021): 1761. http://dx.doi.org/10.11591/ijeecs.v23.i3.pp1761-1777.

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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

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21

Mamykin, A. V., A. L. Kukla, L. M. Matvienko, H. V. Dorozinska, V. P. Maslov, and G. V. Dorozinsky. "Highly informative integrated method for determining the type of engine oil." Технология и конструирование в электронной аппаратуре, no. 3-4 (2019): 36–44. http://dx.doi.org/10.15222/tkea2019.3-4.36.

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The presence of correlation dependences between the type of motor oil and its refractometric and electrophysical characteristics (refractive index, specific resistance and dielectric constant) is experimentally shown. Methods for determining the type of engine oil are proposed, based on the measurement of these characteristics, as well as prototypes of portable measuring devices that implement these methods. Impedance spectroscopy was used to determine the resistivity and dielectric constant, and a device based on the effect of surface plasmon resonance was used to determine the refractive ind

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22

Yusof, Siti Mariam, Nuriziani Hussin, Muzamir Isa, Mohamad Kamarol Mohd Jamil, and Kiasatina Azmi. "Study on Palm Oil and Treated Waste Vegetable Oil Impregnated Paper." Key Engineering Materials 744 (July 2017): 511–15. http://dx.doi.org/10.4028/www.scientific.net/kem.744.511.

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Oil impregnated insulation paper plays an important role in a transformer as it insulates the windings from high voltage and current. Other than the type of paper used, the properties of oil such as viscosity, relative permittivity and dielectric loss play a major factor that contributes to the quality of the insulation paper. This paper discussed the sonication and esterification process on palm oil and treated waste vegetable oil and its’ effects on the performance of oil impregnated paper. Basically through these processes, viscosity of oils will reduce. However, the resultant permittivity

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23

Lizhi, Hu, K. Toyoda, and I. Ihara. "Discrimination of olive oil adulterated with vegetable oils using dielectric spectroscopy." Journal of Food Engineering 96, no. 2 (2010): 167–71. http://dx.doi.org/10.1016/j.jfoodeng.2009.06.045.

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24

Ahmadova, Kh N. "Spectroscopic ellipsometric investigation of optical parameters of oil-water thin multiple systems." International Journal of Modern Physics B 34, no. 08 (2020): 2050058. http://dx.doi.org/10.1142/s0217979220500587.

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To determine the optical parameters of crude oil and seawater systems, we carried out spectral investigations using the ellipsometry method, which is a highly sensitive and accurate optical method for studying the surfaces and interfaces of various media. This method is based on studying the change in the polarization state of reflected light after its interaction with the surface of interfaces of these media. Crude oil and seawater from different regions of Caspian Sea were accessed by spectroscopic ellipsometry over the 200–1700 nm spectral range at room-temperature. Optical constants and di

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25

Vysogorets, S. P., A. N. Nazarychev, and A. A. Pugechov. "METHOD FOR EXPERIMENTAL DETERMINATION OF THE LIQUID DIELECTRIC RESOURCE AND MEASURES FOR ITS RESTORATION." Kontrol'. Diagnostika, no. 254 (2019): 36–41. http://dx.doi.org/10.14489/td.2019.08.pp.036-041.

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The theoretical foundations of changes in the transformer oil quality characteristics, depending on the aging degree, are presented. The introduction of a new indicator of the exploitational transformer oils quality – “stability against oxidation” – is substantiated as a way of solving the scientific and technical problem of assessing the resource characteristics of a transformer insulating system. In order to select the best measures to maintain the quality of power transformers insulating oils, a newly developed “Method for the Experimental Determination of the Luquid Dielectric Resource and

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26

Raj, Raymon Antony, Ravi Samikannu, Abid Yahya, and Modisa Mosalaosi. "Investigation of Survival/Hazard Rate of Natural Ester Treated with Al2O3 Nanoparticle for Power Transformer Liquid Dielectric." Energies 14, no. 5 (2021): 1510. http://dx.doi.org/10.3390/en14051510.

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Increasing usage of petroleum-based insulating oils in electrical apparatus has led to increase in pollution and, at the same time, the oils adversely affect the life of electrical apparatus. This increases the demand of Mineral Oil (MO), which is on the verge of extinction and leads to conducting tests on natural esters. This work discusses dielectric endurance of Marula Oil (MRO), a natural ester modified using Conductive Nano Particle (CNP) to replace petroleum-based dielectric oils for power transformer applications. The Al2O3 is a CNP that has a melting point of 2072 °C and a low charge r

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27

N, Prof Eze,Anthony, and Dr Okoye,Peter I. "Investigation of the Dielectric Strengths of Locally Sourced Vegetable Oil as an Alternative to Mineral Based Transformer Oil." International Journal of Innovative Science and Research Technology 5, no. 6 (2020): 366–69. http://dx.doi.org/10.38124/ijisrt20jun170.

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The main purpose of the study was to investigate the dielectric strengths of locally produced vegetable oils from Nigerian farms to compare the dielectric strength of the vegetable oil with the mineral oil to see if vegetable oil can be used as an alternative for insulating and cooling of transformers. It was an experimental research. The experimental procedures adopted in carrying out the investigation were sample collection, processing of sample and storing and testing for different properties such as pour point, flash point, peroxide value determination (aging), moisture content, and breakd

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28

Reddy, G. Gowtham, Balasubramaniyan Singaravel, and K. Chandra Shekar. "Experimental Investigation of Sunflower Oil as Dielectric Fluid in Die Sinking Electric Discharge Machining Process." Materials Science Forum 969 (August 2019): 715–19. http://dx.doi.org/10.4028/www.scientific.net/msf.969.715.

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Electric Discharge Machining (EDM) is used to machine complex geometries of difficult to cut materials in the area of making dies, mould and tools. Currently, hydrocarbon based dielectric fluids are used in EDM and which plays major role for material removal and it emits harmful emission. In this work, vegetable oil is attempted as dielectric fluid and their performance are studied during processing of AISI P20 steel. The effect of pulse on time (Pon) , pulse off time (Poff), and current (A) on Material Removal Rate (MRR), Tool wear rate (TWR) and surface roughness (SR) are analyzed. The resul

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29

Fernández, Inmaculada, Rafael Valiente, Félix Ortiz, Carlos J. Renedo, and Alfredo Ortiz. "Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging." Nanomaterials 10, no. 4 (2020): 692. http://dx.doi.org/10.3390/nano10040692.

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Over the last few decades the insulating performance of transformer oils has been broadly studied under the point of view of nanotechnology, which tries to improve the insulating and heat dissipation performance of transformer oils by suspending nanoparticles. Many authors have analyzed the thermal and dielectric behavior of vegetable oil based-nanofluids, however, very few works have studied the evolution of these liquids during thermal aging and their stability. In this paper has been evaluated the performance of aged vegetable oil based-nanofluids, which have been subjected to accelerated t

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30

Radu, Maria-Crina, Raluca Tampu, Valentin Nedeff, Oana-Irina Patriciu, Carol Schnakovszky, and Eugen Herghelegiu. "Experimental Investigation of Stability of Vegetable Oils Used as Dielectric Fluids for Electrical Discharge Machining." Processes 8, no. 9 (2020): 1187. http://dx.doi.org/10.3390/pr8091187.

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One main drawback of electrical discharge machining (EDM) is related to the dielectric fluid, since it impacts both the environment and operator health and safety. To resolve these issues, recent research has demonstrated the technical feasibility and qualitative performance of vegetable oils as substitutes for hydrocarbon-based dielectric and synthetic oils in EDM. However, due to the higher content of unsaturated fatty acids, vegetable oils lose their stability, due to several factors such as heating or exposure to light or oxygen. The present study is a first attempt to analyze the extent t

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31

Lijun Yang, S. M. Gubanski, Y. V. Serdyuk, and J. Schiessling. "Dielectric properties of transformer oils for HVDC applications." IEEE Transactions on Dielectrics and Electrical Insulation 19, no. 6 (2012): 1926–33. http://dx.doi.org/10.1109/tdei.2012.6396949.

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Maina, R., V. Tumiatti, M. Pompili, and R. Bartnikas. "Dielectric Loss Characteristics of Copper-Contaminated Transformer Oils." IEEE Transactions on Power Delivery 25, no. 3 (2010): 1673–77. http://dx.doi.org/10.1109/tpwrd.2010.2043693.

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Ru-Pin, Pan, Sheu Chia-Rong, and L. Lam. "Dielectric breakdown patterns in thin layers of oils." Chaos, Solitons & Fractals 6 (January 1995): 495–509. http://dx.doi.org/10.1016/0960-0779(95)80057-n.

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34

Chera Anghel, Irina Alina, and Loredana Popescu. "Optimizing characteristics in mineral insulating oil used in high power transformers." SIMI 2019, SIMI 2019 (September 20, 2019): 222–28. http://dx.doi.org/10.21698/simi.2019.fp29.

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The most commonly used insulating liquid in transformers is mineral oil. Special synthetic applications such as silicone, ester, perchloroethene, etc. are used today in special applications, with different characteristics, very low or nonexistent toxicity to mineral oils used in transformers. On the other hand, they have a much better biodegradability than mineral oils in both aerobic and anaerobic conditions. But they cannot directly replace the mineral oil in operation or in repaired units. They have dielectric properties and good heat transfer but have limited their use to special transform

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Du, Bin, Jian Li, Feipeng Wang, Wei Yao, and Shuhan Yao. "Influence of Monodisperse Fe3O4Nanoparticle Size on Electrical Properties of Vegetable Oil-Based Nanofluids." Journal of Nanomaterials 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/560352.

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Insulating oil modified by nanoparticles (often called nanofluids) has recently drawn considerable attention, especially concerning the improvement of electrical breakdown and thermal conductivity of the nanofluids. In this paper, three sized monodisperse Fe3O4nanoparticles were prepared and subsequently dispersed into insulating vegetable oil to achieve nanofluids. The dispersion stability of nanoparticles in nanofluids was examined by natural sedimentation and zeta potential measurement. The electrical breakdown strength, space charge distribution, and several dielectric characteristics, for

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36

Sokolovic, Dunja, Radmila Secerov-Sokolovic, and Slobodan Sokolovic. "Rheology of unstable mineral emulsions." Chemical Industry 67, no. 2 (2013): 293–301. http://dx.doi.org/10.2298/hemind120216070s.

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In this paper, the rheology of mineral oils and their unstable water emulsion were investigated. The oil samples were domestic crude oil UA, its fractions UA1, UA4 and blend semi-product UP1, while the concentration of oil in water emulsions was in the range from 1 up to 30%. The results were analyzed based on shear stress. The oil samples UA, UA1 and UP1 are Newtonian fluids, while UA4 is pseudoplastic fluid. The samples UA and UA4 show higher value of shear stress (83.75 Pa, 297 Pa), then other two samples UA1 and UP1 (18.41 Pa, 17.52 Pa). Rheology of investigated oils due to its complex che

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Qureshi, Suhail Asghar, Zuhairiah Zainal Abidin, Adel Yahya Isa Ashyap, et al. "Millimetre-Wave Metamaterial-Based Sensor for Characterisation of Cooking Oils." International Journal of Antennas and Propagation 2021 (March 12, 2021): 1–10. http://dx.doi.org/10.1155/2021/5520268.

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The characterisation of the cooking oils presents a significant challenge due to minor changes in their dielectric behaviour. In this paper, a new metamaterial-based sensor incorporating a split-ring resonator (SRR) with a microstrip transmission line is presented to characterise cooking oils. The design demonstrates metamaterial characteristics of negative permittivity and permeability simultaneously at the resonance frequency. Furthermore, its operation in the range of millimetre-wave frequencies can further enhance its sensitivity, especially for liquid materials. The sensor’s novelty is th

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Garifullin, Marsel Sh, Marina N. Lyutikova, Adelya R. Kuchkarova, Azat R. Bikzinurov, and Yuliya N. Solobodina. "Application of IR spectroscopy to control oxidation inhibitor (ionol) concentration in mineral transformer oils." E3S Web of Conferences 216 (2020): 01056. http://dx.doi.org/10.1051/e3sconf/202021601056.

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Mineral insulating oils used as dielectric and heat dissipating agent in high voltage oil-filled equipment are subject to oxidation. Oxidation results in the appearance of undesirable substances that reduce the electrical insulating properties of liquids. Therefore, to inhibit the oxidation process, an antioxidant additive is introduced into transformer oils. In the overwhelming majority, 2,6-di-tert-butyl-4-methylphenol (ionol) is used as an inhibitor. Residual concentration of ionol is a regularly monitored parameter. In Russia, the main method for determining the concentration of ionol in o

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Rafiq, Muhammad, Yuzhen Lv, and Chengrong Li. "A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids." Journal of Nanomaterials 2016 (2016): 1–23. http://dx.doi.org/10.1155/2016/8371560.

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The mineral oil or synthetic oil in conjunction with paper is mainly being applied as dielectric medium in many of the high voltage apparatus. However, the advent of high voltage levels such high voltage alternating current (HVAC) and high voltage direct current (HVDC) has prompted researchers to direct their focus onto an insulation system which can bear the rising high voltage levels. The modern insulating liquid material development is guided by various factors such as high electrical insulation requirements and other safety and economic considerations. Therefore transformer manufacturer co

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Kozlov, Vladimir, Dilya Valiullina, Olga Kurakina, and Erenkst Cadykov. "Determination of Transformer Oil Quality Parameters by its Color Coordinates." Problems of the Regional Energetics, no. 3(51) (August 2021): 24–36. http://dx.doi.org/10.52254/1857-0070.2021.3-51.03.

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The service life of transformers and, as a consequence, of the electric power systems depends largely on the chemical composition and electrical insulating properties of the oil. In this regard, much attention is paid to the control of physical and chemical indicators and operational properties of transformer oils. The aim of this work is to determine the important diagnostic parameters such as the acid number and the tangent of the dielectric loss angle of the transformer oil based on the measured coordinates of the color of the transformer oil. This goal is achieved by the study of the coord

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Md Din, Muhamad Faiz, Nurul Sofea Mazlan, ABDUL RASHID BIN ABDUL RAHMAN, Mohd Taufiq Jusoh, Nur Sabrina Suhaimi, and Fakhroul Ridzuan Hashim. "Investigation on the Dielectric Properties of Palm Oil with Silicon Carbide Doping for Transformer Application." Solid State Phenomena 317 (May 2021): 377–82. http://dx.doi.org/10.4028/www.scientific.net/ssp.317.377.

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The dielectric strength of insulating liquids of transformer acts an important parameter in the operation of transformer. Thus, great interest and many studies have been extensively done to improve the dielectric strength. One of study is the introduction of nanoparticle in the transformer oils. Study of the nanoparticles for the last few years had been found that, it can be dispersed in the transformers oils to be nanofluids and directly enhance the transformer performance. In this study, an investigation has been carried out to focus on the effect of silicon carbide (SiC) nanoparticle to AC

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Ab Ghani, Siti Soleha, and Nor Asiah Muhamad. "Review on Dissolved Fault Gases in Monitoring Bio-Oil Filled Transformer." Applied Mechanics and Materials 818 (January 2016): 69–73. http://dx.doi.org/10.4028/www.scientific.net/amm.818.69.

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The combination of solid insulation (usually cellulose paper) and liquid insulation (usually mineral oil) yield good dielectric properties at fair cost. However, arising concerns on environmental effect of mineral oil when leakage and its risk of fire has force researches for alternative fluids. One of the suitable options for replacement of mineral oil is biodegradable oil that is plant-based, high biodegradability, non-toxicity and high fire point. Some refining and modification to crude vegetable oils resulting to suitable transformer dielectric fluid such as BIOTEMP®, ENVIROTEMP® FR3 and P

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Thien, Y. V., N. Azis, J. Jasni, et al. "A Study on the Lightning Impulse Breakdown Voltages of Palm Oil and Coconut Oil by Different Methods." Applied Mechanics and Materials 793 (September 2015): 9–13. http://dx.doi.org/10.4028/www.scientific.net/amm.793.9.

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In recent years, there have been a number of interests on the Palm Oil (PO) and Coconut Oil (CO) as a potential alternative dielectric insulating fluid in transformers which stimulate different types of studies on these oils properties. Among the important studies is the lightning impulse properties. This paper presents the investigation on the lightning impulse breakdown voltage of PO and CO under non-uniform electric field. The PO used in this study is Refined, Bleached and Deodorized Palm Oil (RBDPO) Olein type. The influence of the testing methods, rising-voltage and up-and-down are invest

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Schmidt, Werner F., and Katsumi Yoshino. "Ion mobilities in non-polar dielectric liquids: silicone oils." IEEE Transactions on Dielectrics and Electrical Insulation 22, no. 5 (2015): 2424–27. http://dx.doi.org/10.1109/tdei.2015.005036.

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El-Shami, S. M., I. Zaki Selim, I. M. El-Anwar, and M. Hassan El-Mallah. "Dielectric properties for monitoring the quality of heated oils." Journal of the American Oil Chemists' Society 69, no. 9 (1992): 872–75. http://dx.doi.org/10.1007/bf02636335.

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Cafissi, A., S. Beduschi, V. Balacco, B. Sacchi, and S. P. Trasatti. "Chemical dechlorination of polychlorinated biphenyls (PCBs) from dielectric oils." Environmental Chemistry Letters 5, no. 2 (2007): 101–6. http://dx.doi.org/10.1007/s10311-006-0087-5.

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Khanmamedov, S. A., and A. M. Bardetskii. "Relation between dielectric and viscosity characteristics of turbine oils." Chemistry and Technology of Fuels and Oils 24, no. 5 (1988): 209–11. http://dx.doi.org/10.1007/bf00727834.

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Parizotto, Carlos A., Evandro L. Dall'Oglio, Leonardo G. de Vasconcelos, Paulo T. de Sousa, Eduardo G. R. Taques Filho, and Carlos Alberto Kuhnen. "Measuring dielectric properties for microwave-assisted extraction of essential oils using single-mode and multimode reactors." RSC Advances 9, no. 10 (2019): 5259–69. http://dx.doi.org/10.1039/c8ra08727j.

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Sirenko, H. O., M. I. Martynyuk, and V. P. Svidersky. "Problem of Selection of Lubricants for ethelene High-Pressure Compressors. 1. Statement of a question of Selection of Lubricants for ethelene High-Pressure Compressors." Фізика і хімія твердого тіла 19, no. 3 (2019): 279–86. http://dx.doi.org/10.15330/pcss.19.3.279-286.

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Technology of obtaining and properties of ethylene compositions with different content of oils inside isresearched. It is shown viscous-mechanical properties of polyethylene during addition of different quantity oflubricants. The results of researches of physics-mechanics and dielectric properties of polyethylene, synthesizedduring ingress of naphtene, with addition of 0,15% of different oils and thermooxidants.

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Skierucha, W., A. Wilczek, and A. Szypłowska. "Dielectric spectroscopy in agrophysics." International Agrophysics 26, no. 2 (2012): 187–97. http://dx.doi.org/10.2478/v10247-012-0027-5.

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Dielectric spectroscopy in agrophysicsThe paper presents scientific foundation and some examples of agrophysical applications of dielectric spectroscopy techniques. The aim of agrophysics is to apply physical methods and techniques for studies of materials and processes which occur in agriculture. Dielectric spectroscopy, which describes the dielectric properties of a sample as a function of frequency, may be successfully used for examinations of properties of various materials. Possible test materials may include agrophysical objects such as soil, fruit, vegetables, intermediate and final pro

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