On the fluctuations in positive glow corona

Allen, N.L.; Abdel‐Salam, M.; Boutlendj, M.; Cotton, Ian; Tan, B.

doi:10.1049/iet-smt:20050071

Cited by 5 publications

(9 citation statements)

References 10 publications

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“…Where, K is a constant, =18 [8] or 10.5 [6,12] for SF 6 in nonuniform and quasi-uniform fields, respectively, and ξ c is the critical avalanche length at which α(ξ)=η(ξ), these coefficients are reported before for SF 6 [12] and air [13].…”

Section: Methods Of Analysis a Breakdown Criterionmentioning

confidence: 98%

Particle-initiated breakdown in gas-insulated co-axial configuration

Ward

Morsi

Badawi

2011

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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This paper presents theoretical investigation of conducting particle-initiated breakdown in gas-insulated coaxial configuration under high direct voltage. The presence of contaminating conducting particles could seriously deteriorate the dielectric strength of high voltage gas-insulated substations (GIS) and gas-insulated transmission lines (GITL). This deterioration depends on the shape of the particle, the type and the pressure of the gas insulation, and the electric field. The calculated breakdown voltage initiated by particle is obtained by streamer breakdown criterion. The breakdown voltage calculation calls first for an accurate calculation of the electric field on and around the particle surface. The investigated gap is a three-dimensional field problem due to the asymmetrical space arrangement of the particle inside the gap. The particles studied are of many different shapes and sizes such as spheres, filamentary (wire) particles and fine spheres simulating the surface roughness. To solve this problem, charge simulation technique is used. The calculated field values are utilized in evaluating the breakdown voltage. The effects of varying the field nonuniformity, particle shape and size, gas type and pressure on the breakdown voltage are investigated. The calculated breakdown voltage values agree satisfactorily with those measured experimentally and with those obtained theoretically before.

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Section: Methods Of Analysis a Breakdown Criterionmentioning

confidence: 98%

Particle-initiated breakdown in gas-insulated co-axial configuration

Ward

Morsi

Badawi

2011

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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“…8,9,[11][12][13][14][15][16][17] Over the years, various theoretical models have been proposed in an attempt to explain the phenomenon. 5,11,[18][19][20][21][22][23][24][25][26] Among the successful ones are those based on the fluid and equivalent circuit models.…”

Section: Introductionmentioning

confidence: 99%

Mechanism behind self-sustained oscillations in direct current glow discharges and dusty plasmas

Cho

2013

Preprint

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An alternative explanation to the mechanism behind self-sustained oscillations of ions in direct current (DC) glow discharges is provided. Such description is distinguished from the one provided by the fluid models, where oscillations are attributed to the positive feedback mechanism associated with photoionization of particles and photoemission of electrons from the cathode. Here, oscillations arise as consequence of interaction between an ion and the surface charges induced by it at the bounding electrodes. Such mechanism provides an elegant explanation to why self-sustained oscillations occur only in the negative resistance region of the voltage-current characteristic curve in the DC glow discharges. Furthermore, this alternative description provides an elegant explanation to the formation of plasma fireballs in the laboratory plasma. It has been found that oscillation frequencies increase with ion's surface charge density, but at the rate which is significantly slower than it does with the electric field. The presented mechanism also describes self-sustained oscillations of ions in dusty plasmas, which demonstrates that self-sustained oscillations in dusty plasmas and DC glow discharges involve common physical processes.

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“…The minor discrepancies in the electrode current waveforms between the result of this work and the experimental measurements by others can be attributed to the differences in the setup of the apparatus. [2][3][4][5][6] Illustrated in Fig. 16(a) is the equivalent circuit diagram representation for a typical apparatus in the glow corona experiments.…”

Section: Relativistic Regimementioning

confidence: 99%

“…To this date, the basic underlying mechanism behind such self-sustained current oscillations remains unclear. [2][3][4][5][6] Morrow did a theoretical work in an attempt to explain the underlying physics behind the self-sustained current oscillations in the positive glow corona. 4 Qualitatively, his predictions are consistent with the various experimental observations by others.…”

Section: Mechanism For Self-sustained Oscillations In the Positimentioning

confidence: 99%

“…[2][3][4][5][6] The selfsustained pulsing in the positive glow corona (also referred to as direct current (DC) glow discharge) can be qualitatively explained from the aforementioned, oscillating, chargedparticle dynamics. In this paper, I shall show that the selfsustained pulsing in the positive glow corona involves the kind of charged-particle oscillation mechanism discussed in Figs.…”

Section: Introductionmentioning

confidence: 99%

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Physics of self-sustained oscillations in the positive glow corona

Cho

2012

Physics of Plasmas

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The physics of self-sustained oscillations in the phenomenon of positive glow corona is presented. The dynamics of charged-particle oscillation under static electric field has been briefly outlined; and, the resulting self-sustained current oscillations in the electrodes have been compared with the measurements from the positive glow corona experiments. The profile of self-sustained electrode current oscillations predicted by the presented theory qualitatively agrees with the experimental measurements. For instance, the experimentally observed saw-tooth shaped electrode current pulses are reproduced by the presented theory. Further, the theory correctly predicts the pulses of radiation accompanying the abrupt rises in the saw-tooth shaped current oscillations, as verified from the various glow corona experiments.Comment: This paper has been published at Physics of Plasmas, American Institute of Physic

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On the fluctuations in positive glow corona

Cited by 5 publications

References 10 publications

Particle-initiated breakdown in gas-insulated co-axial configuration

Particle-initiated breakdown in gas-insulated co-axial configuration

Mechanism behind self-sustained oscillations in direct current glow discharges and dusty plasmas

Physics of self-sustained oscillations in the positive glow corona

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