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Vacuum, 1977
It is shown that vacuum flashover is due to one or another process alternatively: (a) a thermal breakdown in the thin pre-surface layer of dielectric and (b) a streamer discharge in the desorbed gas cloud. The thermal flashover is observed in dielectrics with ρ v ≤ 10 11 -10 12 Ω cm under dc voltage.
AA Avdienko, MD Malev
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It is shown that vacuum flashover is due to one or another process alternatively: (a) a thermal breakdown in the thin pre-surface layer of dielectric and (b) a streamer discharge in the desorbed gas cloud. The thermal flashover is observed in dielectrics with ρ v ≤ 10 11 -10 12 Ω cm under dc voltage.
AA Avdienko, MD Malev
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Atmospheric variations and apparatus flashover
Electrical Engineering, 1941I. Introduction IN practically all electrical apparatus use is made of the insulating properties of air. The electrical breakdown strength of air, for the electrode arrangements found in apparatus, depends upon air temperature, pressure and moisture content.
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Journal of Physics D: Applied Physics, 2020
Charge accumulation phenomenon on gas–solid interface greatly restricts the development of HVDC energy transmission system. In this study, the surface charge transport behavior and flashover performance on alumina/epoxy spacer coated by SiC/epoxy ...
Jianyi Xue +6 more
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Charge accumulation phenomenon on gas–solid interface greatly restricts the development of HVDC energy transmission system. In this study, the surface charge transport behavior and flashover performance on alumina/epoxy spacer coated by SiC/epoxy ...
Jianyi Xue +6 more
semanticscholar +1 more source
Impulse Flashover of Insulators
Transactions of the American Institute of Electrical Engineers, 1929For the most part this paper is a discussion of the mechanism of insulator flashover. The breakdown of air between electrodes, with particular consideration of the effect of various factors upon the flashover characteristics of insulator strings equipped with arcing rings, is discussed.
J. J. Torok, W. Ramberg
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UV Induced Insulator Flashover
2008 IEEE International Power Modulators and High-Voltage Conference, 2008Insulators are critical components in high-energy, pulsed power systems. It is known that the vacuum surface of the insulator will flashover when illuminated by ultraviolet (UV) radiation depending on the insulator material, insulator cone angle, applied voltage and insulator short-history.
J. B. Javedani +5 more
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Flashover of suspension insulators
Electrical Engineering, 1949FLASHOVER of suspension insulators on steel towers caused by a deposit of moisture on dirty insulators is not unusual on high-voltage transmission lines. These troubles can be prevented by washing the insulators; however, this procedure is expensive so that frequent washing is undesirable.
H. A. Adler +2 more
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1988
Remedies are called for, evidently, when the flashover frequency rises above acceptable levels. What is 'acceptable' depends on the importance of the line or substation and on the required quality of supply, in terms of outage time per year. Standards thus vary widely: for lines, a rate of about one flashover per 150 km per year is general for ...
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Remedies are called for, evidently, when the flashover frequency rises above acceptable levels. What is 'acceptable' depends on the importance of the line or substation and on the required quality of supply, in terms of outage time per year. Standards thus vary widely: for lines, a rate of about one flashover per 150 km per year is general for ...
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Observable characteristics of flashover
Fire Safety Journal, 2012Abstract Definitions of flashover are multifarious but may be categorized as three types: mathematical, visual and those relying on diction. There are at least two arguments to be had with regard to the definition of flashover: (i) Is rapidity of transition to a state of total surface involvement an essential criterion for flashover?
J. Francis, A.P. Chen
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Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1973, 1973
When a solid insulator in vacuum is subjected to a high-voltage pulse with short rise time, a low-resistance flashover path may be formed in a few nanoseconds across several centimeters of insulator surface.1,2 Although the details of the breakdown mechanism remain obscure, it is generally accepted that field emission of electrons at the cathode ...
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When a solid insulator in vacuum is subjected to a high-voltage pulse with short rise time, a low-resistance flashover path may be formed in a few nanoseconds across several centimeters of insulator surface.1,2 Although the details of the breakdown mechanism remain obscure, it is generally accepted that field emission of electrons at the cathode ...
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Proceedings ISDEIV. 18th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No.98CH36073), 2002
Despite a controversy that is as old as the model the secondary electron cascade for explaining the flashover still abounds. However, advanced understanding of charge trapping and associated energetic phenomena in insulators open new perspectives. The logic of pulse power experiments was to measure a flashover strength under short voltage pulses (ns ...
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Despite a controversy that is as old as the model the secondary electron cascade for explaining the flashover still abounds. However, advanced understanding of charge trapping and associated energetic phenomena in insulators open new perspectives. The logic of pulse power experiments was to measure a flashover strength under short voltage pulses (ns ...
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