A tutorial on vacuum surface flashover

Harris, John R.

doi:10.1109/tps.2017.2759248

Cited by 12 publications

(1 citation statement)

References 61 publications

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“…Previous work in this area [7] has surmised that compressed air is viable for electrical insulation; however, its use would require testing and design of new systems to replace present SF6 systems. SF6 has been well-studied with respect to surface flashover [8 -11] and, while past research has covered flashover in air at pressures ranging from one atmosphere down to vacuum for insulated systems [12,13], there exists a lack of published data on flashover characteristics of compressed-air insulated systems. Furthermore, many DC flashover studies do not record the statistical time lag, the elapsed time prior to flashover after the application of sufficient voltage, which is crucial to the system design since the statistical time lag to flashover for a system should be orders of magnitude greater than the time-span for which the system will remain in a charged state.…”

Section: Introductionmentioning

confidence: 99%

HVDC Surface Flashover in Compressed Air for Various Dielectrics

Bean

Adams

Weber

2020

IEEE Trans. Dielect. Electr. Insul.

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This study measures the voltage at which flashover occurs in compressed air for a variety of dielectric materials and lengths in a uniform field for DC voltages up to 100 kV. Statistical time lag is recorded and characterized, displaying a roughly exponential dependence on breakdown voltage. Of the materials tested, acrylic is observed to be the most resistant to flashover. These data are intended to facilitate the design of compressed-air insulated high voltage systems as an alternative to SF6 insulated systems.

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Section: Introductionmentioning

confidence: 99%

HVDC Surface Flashover in Compressed Air for Various Dielectrics

Bean

Adams

Weber

2020

IEEE Trans. Dielect. Electr. Insul.

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Performance optimization of indirectly heated cathode based electron gun by controlling high voltage surface flashover and beam positioning at target plane

Goel

Roy

Maiti

2022

Vacuum

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Verifications of Schottky's Conjecture

Harris

Jensen

2019

Journal of Applied Physics

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Schottky's Conjecture posits that the geometric field enhancement produced by a hybrid shape formed from a small perturbation on a larger base is the product of the individual field enhancement factors of the base and perturbation in isolation. This is a powerful concept with practical applications to understanding field emitter design and operation, as actual field emitters have complicated surface shapes with structure and, therefore, contributions to field enhancement, occurring simultaneously on many length scales. Recent studies of the Conjecture imply that the degree to which it accurately predicts a hybrid structure's total field enhancement depends on the degree of self-similarity between the base and perturbation shapes. To explore these aspects of the Conjecture, we have used the zero-potential surface produced by simple charge distributions to produce compound shapes with small perturbations on larger base structures. In the limit of small perturbation strength, these simple models adequately approximate idealized compound shapes, such a hemisphere-on-hemisphere geometry. Changing the base shape and the location of the perturbation allows us to selectively degrade the self-similarity present in the problem geometry. Proofs of the Schottky Conjecture in the limit of small perturbation strength will be provided, using these techniques, for hemisphere-on-hemisphere and half-cylinder-on-half-cylinder systems—the latter being the geometry considered by Schottky and for which the Conjecture was first proposed, but not proven.

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A tutorial on vacuum surface flashover

Cited by 12 publications

References 61 publications

HVDC Surface Flashover in Compressed Air for Various Dielectrics

HVDC Surface Flashover in Compressed Air for Various Dielectrics

Performance optimization of indirectly heated cathode based electron gun by controlling high voltage surface flashover and beam positioning at target plane

Verifications of Schottky's Conjecture

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