2020
DOI: 10.1109/tdei.2019.008551
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Numerical simulation of the positive streamer propagation and chemical reactions in SF6/N2 mixtures under non-uniform field

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Cited by 24 publications
(8 citation statements)
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“…As stated in the introductory part, the use of alternative insulating gases, such as SF 6 /N 2 mixtures [27] or fluoronitriles, requires knowledge of voltage holding capabilities [28]. Using the streamer inception criterion to estimate such voltage holding capability, requires an expression for the effective ionization coefficient.ᾱ can be obtained experimentally or, more conveniently, can be calculated numerically solving the collisional Boltzmann equation for a specified set of electron collisional reactions [29,30]. This procedure starts with the definition of the set of reactions, R i , each characterized by its scattering cross section σ i ( ), function of the incident electron energy.…”
Section: Effective Ionizationmentioning
confidence: 99%
“…As stated in the introductory part, the use of alternative insulating gases, such as SF 6 /N 2 mixtures [27] or fluoronitriles, requires knowledge of voltage holding capabilities [28]. Using the streamer inception criterion to estimate such voltage holding capability, requires an expression for the effective ionization coefficient.ᾱ can be obtained experimentally or, more conveniently, can be calculated numerically solving the collisional Boltzmann equation for a specified set of electron collisional reactions [29,30]. This procedure starts with the definition of the set of reactions, R i , each characterized by its scattering cross section σ i ( ), function of the incident electron energy.…”
Section: Effective Ionizationmentioning
confidence: 99%
“…According to Refs. [20,21], the photoionization term can be simplified to a uniform background ionization, i.e., the source term S ph can be set to a constant, assuming the existence of a uniform ionization reaction in gas space that is not affected by the applied electric field, and replacing photoionization with that ionization reaction, and the validity of this method has been verified. And the ion can be considered as stationary in a few nanoseconds, because the charge-to-mass ratio of the ion is much smaller than that of the electron [22].…”
Section: Numerical Simulation Modelmentioning
confidence: 99%
“…According to Refs. [20,21], the photoionization term can be The ionization coefficient and the attachment coefficient will be varied by the change of electric field. When the ionization coefficient minus the attachment coefficient is zero, the corresponding electric field at that time is called critical electric field.…”
mentioning
confidence: 99%
“…The study of streamer traversal in the discharge gap helps to quantify the streamer inception times, which may aid in more accurate design and development of high-performance pulsed source that uses SF 6 admixture as a switch gas. There are many numerical studies devoted to the analysis of streamer propagation in pure SF 6 and binary mixture of SF 6 with N 2 and O 2 [15,16]. Shishavan et al [17] modelled a high pressure peaking switch by using COMSOL Multiphysics, and quantified the relationship amongst key variables such as operating pressure and dV/dT on stochastic operation of closing switch in H 2 /N 2 admixture.…”
Section: Introductionmentioning
confidence: 99%