Topic
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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TL;DR: In this article, a dielectric liquid placed between two horizontal isothermal coaxial cylinders and subjected to the simultaneous action of a thermal gradient and an electric field was solved using the control volume method.
19 citations
01 Jan 2018-Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology
TL;DR: In this article, nitrogen plasma jet (NPJ) is used as a dielectric to increase the discharge gap of micro discharge machining in gas, and the machining characteristics of micro EDM in NPJ are investigated and compared with those in other dielectrics.
Abstract: Dielectric, such as kerosene-based oil, deionized water or air, is an essential part of electrical discharge machining (EDM). It directly influences machining performance of the EDM process. While there is large tool electrode wear during machining in liquid dielectric, micro EDM in gas dielectric exhibits almost no tool electrode wear. However, small discharge energy, low dynamic viscosity and low debris concentration of micro EDM in gas creates narrow discharge gap, causing frequent occurrence of abnormal discharge. In this paper, nitrogen plasma jet (NPJ) is used as a dielectric to increase the discharge gap of micro EDM in gas. The machining characteristics of micro EDM in NPJ are investigated and compared with those in other dielectrics. It was found that the discharge distance, machining efficiency and surface quality are significantly improved in NPJ, compared to those in gas under the same conditions. The coaxial high-velocity air jet is helpful to reduce short circuits. Experimental results reveal that NPJ is a viable dielectric in micro EDM.
19 citations
TL;DR: In this article, the tree initiation voltage of impregnated crosslinked polyethylene (XLPE) with a dielectric liquid is drastically improved compared to normal XLPE for both ac and impulse voltage application.
Abstract: The tree initiation voltage of impregnated crosslinked polyethylene (XLPE) with a dielectric liquid is drastically improved compared to normal XLPE for both ac and impulse voltage application. It is considered that liquid fills the polymer free volume, and removes space for electrons to be accelerated to high energy. The experimental results support that collision impact of electrons accelerated in polymer free volume is the dominant cause of electrical tree initiation, and also show that liquid impregnation is a promising way to improve performance and prolong the life of polymeric insulating materials.
19 citations
21 May 2006
TL;DR: In this article, a series of reports presents a summary of work that has been completed to date and examines initial customer experience with the use of natural esters in real transformers.
Abstract: Natural ester seed oil based dielectric fluid is an environmentally advantaged fluid that is increasingly being used as a replacement for mineral oil and for high temperature flashpoint liquids, including silicone and R-TEMP. Considerable studies have been conducted to investigate heat aging performance of cellulose, electrical contact thermal stability, dielectric strength, moisture sensitivity, and cold temperature performance. A series of reports presents a summary of work that has been completed to date and examines initial customer experience with the use of natural esters in real transformers. The work contains both new transformers and retro-fills in distribution and power transformers as well as step voltage regulators and switchgear
19 citations
TL;DR: In this article, a dielectric fluid confined in a cylindrical annulus of infinite length is analyzed under microgravity conditions, where a radial temperature gradient and a high alternating electric field imposed over the gap induce an effective gravity that can lead to thermal convection even in the absence of the terrestrial gravity.
19 citations