Die Ermittlung physikalischer Entladungsparameter in Isoliergasen und Isoliergasgemischen mit einer verbesserten Swarm-Methode

Aschwanden, T.

doi:10.3929/ethz-a-000397035

Cited by 9 publications

(3 citation statements)

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“…In mixtures with N 2 and CO 2 both gases show synergism (figure 7) in the sense that the mixture with low mole fraction of the fluorinated gas yields a higher (E/N) crit than what would be expected from a linear interpolation (see [19,20]). However, the effect is less pronounced than for the SF 6 :N 2 mixtures, as measured by Aschwanden [18].…”

Section: Synergism In Mixtures With N 2 and Comentioning

confidence: 75%

Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation

Hösl

Pachin

Chachereau

et al. 2018

J. Phys. D: Appl. Phys.

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Perfluorinated cyclic ethers represent an interesting class of molecules to use as dielectric gases for electrical insulation. Measurements of the two compounds 4,4,5,5-Tetrachloro-2,2-difluoro-1,3-dioxolane (c-C 3 Cl 4 F 2 O 2 , CAS 87075-01-2) and Octafluoro-1,4-dioxane (c-C 4 F 8 O 2 , CAS 32981-22-9) in a Pulsed Townsend Experiment are presented, their ionization and attachment rate coefficients are obtained and their electron attachment cross sections are estimated. Both gases have a high critical electric field strength of about 3.5 and 1.3 times the one of SF 6 , respectively, which is presumably due to very high electron attachment cross sections in the range from 2 − 4 eV. In particular, for cC 3 Cl 4 F 2 O 2 the values appear to be very close to the S-wave scattering limit around 3 eV. Based on these results, we recommend the two analogous compounds Perfluoro-1,3-dioxolane (c-C 3 F 6 O 2 , CAS 21297-65-4) and Perfluoro-oxetane (c-C 3 F 6 O, CAS 425-82-1) for further research for the use as insulation and refrigerant gases, since they are chemically comparable, presumably environmentally friendly, and have high vapor pressures.

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Section: Synergism In Mixtures With N 2 and Comentioning

confidence: 75%

Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation

Hösl

Pachin

Chachereau

et al. 2018

J. Phys. D: Appl. Phys.

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“…The density-normalized longitudinal diffusion coefficients of electrons in CF 3 I-SF 6 -N 2 and CF 3 I-SF 6 -CO 2 are plotted in figures 4 and 5, respectively. These parameters are difficult were calculated using Bolsig + [33,34], while those of SF 6 and CF 3 I are from [37,38] and [30], respectively. The density-normalized longitudinal diffusion coefficients of electrons in the CF 3 I-SF 6 -CO 2 mixtures.…”

Section: Longitudinal Diffusion Coefficientsmentioning

confidence: 99%

“…Figure 4.The density-normalized longitudinal diffusion coefficients of electrons in the CF 3 I-SF 6 -N 2 mixtures. The ND L values for N 2 were calculated using Bolsig +[33,34], while those of SF 6 and CF 3 I are from[37,38] and[30], respectively.…”

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confidence: 99%

Electron swarm coefficients and critical field strength of the gaseous ternary mixtures CF₃I-SF₆-N₂ and CF₃I-SF₆-CO₂

González-Magaña

Colorado

Basurto

et al. 2020

J. Phys. D: Appl. Phys.

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The electron drift velocity, longitudinal diffusion and effective ionization coefficients in the gaseous ternary mixtures CF3I-SF6-N2 and CF3I-SF6-CO2 have been measured using a pulsed Townsend apparatus over the density-normalized electric field intensity, E/N, from 230 to 470 Td and 230 to 430 Td, respectively (1 Td = 10−17 V cm2). Several ternary gas mixture compositions containing 10% to 50% CF3I or SF6 and either N2 or CO2 have been studied. Also, we have measured the critical field strength, E/Ncrit, for all of these gaseous mixtures, finding out that the 40% CF3I–40% SF6–20% N2 and 40% CF3I–40% SF6–20% CO2 have an E/Ncrit value smaller by only 4.0% and 1.0%, respectively than that of pure SF6 (360 Td). Provided that both CF3I, CO2 and N2 are environmentally friendly, its addition to SF6 may be highly advantageous over other binary SF6 mixtures with gases having relatively high warming potentials, since these mixtures have only 40% SF6 and behave, from the swarm physics point of view as good candidates to ameliorate impact of SF6 when released into the atmosphere. An interesting synergetic effect has been found for the CF3I-SF6 mixture when N2 added and has been interpreted in terms of the efficient low-energy electron scattering of N2 at low collision energies up to 2 eV.

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Dielectric Characteristics of SF6-N2-Mixtures for Very Fast Transient Voltages

Pfeiffer¹,

Schoen²,

Zender³

1998

Gaseous Dielectrics VIII

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Die Ermittlung physikalischer Entladungsparameter in Isoliergasen und Isoliergasgemischen mit einer verbesserten Swarm-Methode

Cited by 9 publications

References 0 publications

Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation

Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation

Electron swarm coefficients and critical field strength of the gaseous ternary mixtures CF₃I-SF₆-N₂ and CF₃I-SF₆-CO₂

Dielectric Characteristics of SF6-N2-Mixtures for Very Fast Transient Voltages

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Die Ermittlung physikalischer Entladungsparameter in Isoliergasen und Isoliergasgemischen mit einer verbesserten Swarm-Methode

Cited by 9 publications

References 0 publications

Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation

Perfluoro-1,3-dioxolane and perfluoro-oxetane: promising gases for electrical insulation

Electron swarm coefficients and critical field strength of the gaseous ternary mixtures CF3I-SF6-N2 and CF3I-SF6-CO2

Dielectric Characteristics of SF6-N2-Mixtures for Very Fast Transient Voltages

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Electron swarm coefficients and critical field strength of the gaseous ternary mixtures CF₃I-SF₆-N₂ and CF₃I-SF₆-CO₂