study of the breakdown of liquid dielectrics by positive discharges.
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study of the breakdown of liquid dielectrics by positive discharges. by Towfick M. A. Sufian

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Published by University of Salford in Salford .
Written in English


Book details:

Edition Notes

PhD thesis, Electrical Engineering.

SeriesD55702/85
ID Numbers
Open LibraryOL19960883M

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Title Electrical discharge in liquid dielectrics Author(s) Toriyama, Y.; Sawa, S. A few years ago one of the authors of the present study(i} measured the euTrent-voltage eurve as far as the breakdown voltage second is the breakdown in liquid under low atmospheyic pressure, and is caused by the gas adsorbed on the electrodes and absorbed Author: Y. Toriyama, S. Sawa. Electrical Discharge Breakdown Voltage Liquid Dielectric Electric Strength Uniform Electric Field These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves. A theoretical study was conducted by Shneider et al [22] to determine the initiating mechanism of the subnanosecond pulsed breakdown in liquid dielectrics. It was proposed that the. The measured breakdown voltage is influenced by a large number of external factors such as temperature, humidity, duration of test, whether a.c., d.c., or impulse voltage is applied, pressure applied to the electrodes, discharges in the ambient medium, discharges in cavities and many other factors. The fundamental mechanisms of breakdown.

The partial discharge (PD) process in liquid dielectrics is influenced by several factors. Although the PD current contains the information representing the discharge process during the PD event, it is difficult to determine the detailed dynamics of what is happening in the bulk of the liquid. In this paper, a microscopic model describing the dynamics of the charge carriers is implemented. ELECTRIC DISCHARGE IN VACUUM. The electric discharge in vacuum results from the neutral atoms, ions and electrons emitted from the electrodes themselves. Cathode spots are formed depending upon the current flowing. For low currents a highly mobile cathode spot is formed and for large currents a multiple number of cathode spots are formed.   The channels of the positive discharges (Fig. 8) form a bush of a spherical boundary of rising radius as the discharge develops. For both of the investigated dielectric liquids shapes of the discharge forms are identical and are in accordance with the shapes recorded for mineral oil typically used in power transformers as an insulating medium. in gases, Paschen’s law, Breakdown in non-uniform field and corona discharges, Post breakdown phenomena and applications, practical considerations in using gases for insulation purposes. MODULE-II (10 HOURS) Conduction and breakdown in liquid dielectrics: Pure liquids and commercial liquids, conduction and breakdown in pure liquids.

  Dielectric Breakdown In Liquids Purity aspects of liquid dielectrics Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. breakdown (BD) of liquid dielectrics have traditionally been used for controlled macroscale [1] and microscale [2] material removal in electric discharge machining (EDM). A recent work by the authors of this Letter [3] demonstrated that controlled electromachining in dielec-trics confined in nanometer spaces can also be used to. Liquid dielectrics are self-healing; when an electric breakdown occurs, the discharge channel does not leave a permanent conductive trace in the fluid. The electrical properties tend to be strongly influenced by dissolved gases (e.g. oxygen or carbon dioxide), dust, fibers, and especially ionic impurities and moisture. Electrical discharge may cause production of impurities degrading the dielectric's . Keywords: Dielectric banier discharges, spark discharge, air sterilization, water sterilization, breakdown in liquid 1. Motivation A low concentration of pathogenic microorganisms in air and water.