Detachment of Electrons from Negative Ions in Electrical Discharges

Teich, T.H.

doi:10.1007/978-1-4615-3706-9_27

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…The separated electrons are imbibed into the SEEA or collision ionization, helping the formation of a conductive path along the epoxy surface between the electrodes. In other words, a large number of negative ions can improve the surface insulation performance, and at the same time, can function as electron sources [28]. The electron detachment of negative ions mainly occurs from collisions with ions rather than high electric fields [29].…”

Section: Surface Discharge Mechanismmentioning

confidence: 99%

Surface Discharge Mechanism on Epoxy Resin in Electronegative Gases and Its Application

Park

Lim²,

Bae

2020

Applied Sciences

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This study presents the surface discharge characteristics of insulating gases, including sulfur hexafluoride (SF6), dry air, and N2, under a non-uniform field. Surface discharge experiments were conducted, with the gas pressure ranging from 0.1 to 0.6 MPa, on samples of epoxy dielectrics under an AC voltage. The experimental results showed that the surface insulation performance significantly improved in insulating gases possessing electronegative gases, such as SF6 and dry air. Surface flashover voltages of SF6 were saturated with an increasing pressure, compared to dry air and N2. The surface discharge mechanism is proposed to explain the improvement and saturation of dielectric characteristics of the electronegative gas in complex dielectric insulations, as well as its influence on the surface flashover voltage. As an application, an insulation design method is discussed with regards to replacing SF6 gas in high-voltage power equipment based on the knowledge of the physics behind gas discharge.

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Section: Surface Discharge Mechanismmentioning

confidence: 99%

Surface Discharge Mechanism on Epoxy Resin in Electronegative Gases and Its Application

Park

Lim²,

Bae

2020

Applied Sciences

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“…There have been several attempts in solving the continuity equations for electrons and ions when electron detachment takes place [7], [9], [13]. The analysis of electron detachment during the first electron transit is straightforward, yet most of the richness of the avalanche shape that leads to the derivation of detachment coefficients, for example, is contained over the time regime past the electron transit.…”

Section: Effects Of Electron Detachment and Stabilization Of Negatmentioning

confidence: 99%

“…In addition to ionization, attachment, and ion drift, other effects such as the longitudinal diffusion of electrons [8] and electron detachment [7], [9]- [13] have been dealt with. In all these cases, the influence of the finite width of the 0093-3813/$25.00 © 2007 IEEE photoelectron source has been ignored from the outset by assuming a simultaneous electron release as a "Dirac-delta" pulse.…”

Section: A Numerical Simulation Code For Electronic and Ionic Transiementioning

confidence: 99%

A Numerical Simulation Code for Electronic and Ionic Transients From a Time-Resolved Pulsed Townsend Experiment

Urquijo

Juarez

Rodríguez-Luna

et al. 2007

IEEE Trans. Plasma Sci.

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A numerical code which calculating the spatiotemporal development of the discharge current in the Townsend regime has been developed. This code was written in Fortran 77. The individual contribution of electrons, positive, and negative ions to the total measurable current in the pulsed discharge is calculated by solving the corresponding set of coupled continuity equations for each species, for which boundary and initial conditions are set adequately. This simulation code is also capable of considering a more realistic scheme of photoelectron emission, such as that produced using a pulsed ultraviolet laser. In addition, the processes of ion and electron drift and longitudinal diffusion, electron detachment, negative-ion stabilization, and ion conversion have been calculated successfully. Some of these effects are extremely difficult to model analytically, and the simultaneous inclusion of two or more of them proves practically impossible. The power of this method in simulating complex discharge situations is discussed in this paper by means of examples considering the processes of electron and ion drift, diffusion, electron impact ionization and attachment, electron detachment, and negative-ion stabilization.Index Terms-Attachment, continuity equations, diffusion, drift velocity and diffusion, electron and ion swarms, electron detachment, finite difference methods, ionization, ionization and attachment, low temperature plasmas, negative ions, numerical simulation codes, pulsed Townsend experiment.

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Effect of Temperature on the Electron Attachment and Detachment Properties of c-C4F6

Datskos

Christophorou

Carter

1994

Gaseous Dielectrics VII

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Detachment of Electrons from Negative Ions in Electrical Discharges

Cited by 4 publications

References 17 publications

Surface Discharge Mechanism on Epoxy Resin in Electronegative Gases and Its Application

Surface Discharge Mechanism on Epoxy Resin in Electronegative Gases and Its Application

A Numerical Simulation Code for Electronic and Ionic Transients From a Time-Resolved Pulsed Townsend Experiment

Effect of Temperature on the Electron Attachment and Detachment Properties of c-C4F6

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