PhD thesis, Electrical Engineering.
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  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.