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This paper investigated the streamer inception and breakdown properties of a mineral oil and a synthetic ester liquid under DC stress up to 100 kV. To observe the effect of tip radius on streamer inception, the point-plane electrodes configuration with a fixed gap distance of 10 mm and point electrode with the radii of 5 μm, 10 μm, 20 μm and 50 μm were used. To observe the effect of gap distance on...
We have been investigating sterilization of liquid food by high electric field pulse. In this paper, high electric field pulse is applied to aqueous solution with Escherichia coli changing the components of the solution. As results, the survival rate of samples decreases with the ion concentration in aqueous solution. We consider that the performance of high electric field pulse sterilization depends...
We have been studied the sterilization of liquid using high electric field pulse. In this paper, we report the effect of temperature on survival rate in high electric field pulse sterilization. The sample was liquid medium including E. coli (JM103). Experiments were carried out at two temperatures region, room temperature region (18∼25 °C) and low temperature region (2∼5°C). Effect of pulse interval...
Silicone fluids are now being used as an insulator. Watson,2 Hakim,3 and Hosticka4 have carried out some investigations on this liquid. There is still, however, a great deal that is unclear about the breakdown mechanism under high electric field. It is of importance to know the behavior of the current stress characteristic in the region below breakdown, since the breakdown itself in the liquid dielectric...
The work described in this paper is concerned with the investigation of conduction current and breakdown of insulating liquids, both for stationary liquids and when the liquid is in motion. It is generally thought that bubble and bridge formation are involved at some stage in the breakdown process of a liquid. The present work was undertaken to compare the conduction current and breakdown under normal...
Observations of electrohydrodynamic (EHD) and particle motions in transformer oil between sphere-to-plane and plane-to-plane electrodes under 60 Hz stress are reported. Closed circuit television was employed to record laser shadowgraphs of particle and liquid motions on video cassette tapes. Copper, iron, aluminum, and paper particles of varying size and shapes were studied. Particle motions were...
Particles influence both AC and DC voltage breakdown in insulating oil. Larger and conducting particles decrease the breakdown voltage most. For both DC and AC the ratio of breakdown voltage for clean oil to oil with non-conducting particles is nearly the same. For conducting particles the ratio for DC is generally larger than for AC. Particle concentration and motion is influenced by DC and AC stress...
The convection of charge in highly insulating liquids, typically hydrocarbon fuels, is of considerable importance because of the associated generation of high intensity electric fields.1 It is generally accepted that a charge is often generated in two-phase liquid transport. It is not so widely recognized that the transport of this charge at interfaces can be strongly influenced by fluid convection...
As a result of the extensive studies of high-field conduction and flashover in dielectric liquids it is becoming clear that the mechanism of electrical breakdown in such materials is related to the pre-breakdown charge flow. At present it is not known whether the current gives rise to significant heating such that failure occurs due to a thermal run-away1 or whether space-charge accumulation due to...
This work is an extension of that reported in 1950 by E. L. C. Larson and G. M. L. Sommerman. At that time, it was shown that photographic records of impulse ionization in liquids could be obtained, by placing dry photographic paper and impregnated paper pressboard between; disk electrodes, immersing them in the liquid to be tested, and applying a single impulse voltage wave of a magnitude somewhat...
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