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Liquid dielectric

About: Liquid dielectric is a research topic. Over the lifetime, 3702 publications have been published within this topic receiving 45150 citations.


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Journal ArticleDOI
01 Feb 2020
TL;DR: In this article, the surface modification of three-electrode materials, namely aluminium, copper, and stainless steel, by sputtering of titanium dioxide (TiO 2 ) based on magnetron sputtering was examined.
Abstract: Space charge injected into a liquid dielectric by an electrode under an impulse voltage causes the electric field to be distorted, which affects the dielectric's insulation performance. In this study, the authors study the surface modification of three-electrode materials, namely aluminium, copper, and stainless steel, by sputtering of titanium dioxide (TiO 2 ) based on magnetron sputtering. The breakdown voltage of propylene carbonate and the surface morphology of the electrodes before and after modification were examined. Furthermore, the distribution of the space charge injected into the propylene carbonate from the different electrode materials was also measured based on the Kerr electro-optic effect. These results indicate that the breakdown voltage of propylene carbonate increased by 7, 4, and 9% after surface modification of aluminium, copper, and stainless steel, respectively. After sputtering of TiO 2 , micro-grooves on the surface of the three-electrode materials became smooth, and the surface roughness decreased, which changed the barrier height of the solid–liquid interface. The space charge injection mode of the three-electrode materials before and after surface modification was bipolar injection; however, the space charge injection amounts were markedly lower for the modified electrodes.

28 citations

Journal ArticleDOI
TL;DR: In this article, the evolution of the interface between two ideal dielectric liquids in a strong vertical electric field is studied, where the ratio of the permittivities of the liquids is inversely proportional to their densities.
Abstract: The evolution of the interface between two ideal dielectric liquids in a strong vertical electric field is studied. If the ratio of the permittivities of the liquids is inversely proportional to their densities, we find that there is a flow regime for which the velocity and electric field potentials are linearly dependent functions. The corresponding reduced equations of motion are derived for the interface. In the limit of small density ratio, these equations coincide with the well-known equations that describe Laplacian growth.

28 citations

Journal ArticleDOI
TL;DR: In this article, an optimization process of electrode geometry for an electrohydrodynamically driven thin-film evaporator was presented, where the electrodes were deposited on a SiO/sub 2/Si wafer, so the liquid could be held within micrometers of thickness over the surface.
Abstract: This paper presents details of an optimization process of electrode geometry for an electrohydrodynamically (EHD) driven thin-film evaporator. The operation principle of the device is based on the action of the EHD force on the molecules of a dielectric liquid in a highly convergent electric field. The force starts at the end of a pair of electrodes, where the electric field changes from zero far from the electrodes to a finite value in between the electrodes. This force drives the liquid up into the spacing between the electrodes. The electrodes in this study were deposited thinly on a SiO/sub 2//Si wafer, so the liquid could be held within micrometers of thickness over the surface. Since the performance of the device in removing heat from the surface is a function of its pumping head and consequently its electrode geometry, the performances of different electrodes were evaluated by testing twelve sets of electrode pairs with different geometries. Then the optimum electrode design was incorporated into the design of a large size (32/spl times/32 mm/sup 2/) EHD thin-film evaporator. The device was fabricated, and its pumping and heat transfer performances were tested. A pumping head equal to the full height of the electrodes and a heat transfer coefficient of 1.9 W/cm/sup 2/./spl deg/C was achieved using HFE-7100 liquid.

28 citations

Patent
01 Oct 2004
TL;DR: In this article, a dielectric fluid comprising a hydrocarbon liquid mixed with an ester-based compound is used to impart breakdown inhibiting properties to a paper insulation material when the dielectrics fluid is in contact with the paper material.
Abstract: A dielectric fluid comprising hydrocarbon liquid admixed with an ester-based compound, wherein the ester-based compound is present in an effective amount to impart breakdown inhibiting properties to a paper insulation material when the dielectric fluid is in contact with the paper material.

28 citations

Proceedings ArticleDOI
15 May 2006
TL;DR: In this paper, a type of insulating oil refined from a transgenic rapeseed oil is presented, and the chemical, physical, and electric properties of refined oil are presented.
Abstract: Mineral oil is poorly biodegradable and has a low flash point. It does not satisfy the requirement of environmental sustainability and fireproofing. Whereas vegetable oil-based dielectric liquid is fully biodegradable and has a higher flash point and relative permittivity. This paper presents a type of insulating oil refined from a transgenic rapeseed oil. The oil-refining procedure is introduced. Chemical, physical and electric properties of refined insulating oil are presented. Influences of temperature and water content on the electrical breakdown voltage, relative permittivity, and dissipation facto of the refined oil are determined by experiments. Experiment results indicate the transgenic rapeseed oil based dielectric liquid possesses advantages over mineral insulating oil

28 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202328
202267
202191
2020122
2019142
2018120