Time-resolved avalanche current waveforms in octafluorocyclobutane

Wen, C.; Wetzer, J.M.

doi:10.1109/14.19880

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…In this work, we have derived and presented our method of rate fitting, and measured a pressure-dependent critical field strength, leave out density-reduced in dry air. Our findings The left plot shows the effective rate coefficient, calculated from the fitted rates ν i , ν a , ν d , ν c according to equation (11). Since the rate ν c is quadratic in pressure, a pressure dependency of the effective rate is expected (see 11).…”

Section: Discussionmentioning

confidence: 67%

“…Finally, in figure 9 on the left the effective rate coefficient is plotted for different pressures. It is calculated from the fitted rates according to equation (11). For each subset of data points at equal pressure, the effective rate coefficient is strongly increasing with increasing E/N .…”

Section: Resultsmentioning

confidence: 99%

“…The most relevant kinetic processes have been identified, but there is a significant spread in the obtained rates of different authors. Main contributions have been published by Frommhold [3,4], Harrison and Geballe [5], Prasad [6], Moruzzi et al [7], Verhaart and van der Laan [8,9], Wen and Wetzer [10,11], Friedrich [12], Kossy et al [13] and Aleksandrow [14] between 1960 and 1995. A more recent theoretical paper has been published by Pancheshnyi in 2013 [15], in which the author calculates a pressure dependency in the density-reduced critical electric field strength (E/N crit with electric field E and particle density N ) of synthetic air.…”

Section: Introductionmentioning

confidence: 99%

“…on the left the effective rate coefficient is plotted for different pressures. It is calculated from the fitted rates according to equation(11). For each Measurement of swarm parameters in dry air…”

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confidence: 99%

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Measurement of ionization, attachment, detachment and charge transfer rate coefficients in dry air around the critical electric field

Hösl

Häfliger

Franck

2017

J. Phys. D: Appl. Phys.

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We obtain pressure-dependent rate coefficients in dry synthetic air (79% N 2 , 21% O 2) by fitting Pulsed Townsend measurements over a pressure range from 10 to 100 kPa, around the critical density-reduced electric field from 86 to 104 Td. The physical processes are reviewed and set in relation to a suitable kinetic model. A procedure for fitting kinetic reaction rates is described, which is based on finite-volume simulations of charge carrier drift. Electron attachment, ionization and detachment as well as ion conversion rate coefficients are obtained. We find a quadratic pressure dependency in the conversion rate, consistent with three-body collisions, and observe a pressure-dependency in the onset of electron avalanche growth in dry air.

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Section: Discussionmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Measurement of ionization, attachment, detachment and charge transfer rate coefficients in dry air around the critical electric field

Hösl

Häfliger

Franck

2017

J. Phys. D: Appl. Phys.

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“…Besides, c-C 4 F 8 is a strong electronegative, and its insulation ability is high. So, c-C 4 F 8 gas mixtures have been suggested as one of the most promising component gases for gas insulation [3,4] .…”

Section: Introductionmentioning

confidence: 99%

Measurement of swarm parameters of c-C4F8/CO2 and its insulation characteristics analysis

Zhang

Xiao

Zhang

et al. 2008

J. Shanghai Jiaotong Univ. (Sci.)

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In c-C4F8 and c-C4F8/CO2 mixtures, the swarm parameters including ionization coefficient, attachment coefficient and effective ionization coefficient were obtained at the ratio of the electric field strength to the gas density between 150-550 Td by the steady-state Townsend (SST) method. Static breakdown voltages at each ratio were also measured at the SST condition. The limiting field strengths were obtained by two methods: computing the density-normalized effective ionization coefficient as a function of the overall density-reduced electric field strength; and measuring static breakdown voltages as a function of the product of gas density and electrode separation. Good agreement was obtained by these two methods, which ensures the correctness of the former method. The limiting field strengths of c-C4F8 and c-C4F8/CO2 mixtures were compared with those of pure SF6, SF6/CO2 mixtures and pure c-C4F8. It is found that buffer gas CO2 does not reduce the limiting field strengths of c-C4F8 greatly, the limiting field strengths of c-C4F8/CO2 mixtures are higher than those of SF6/CO2 mixtures or even pure SF6, and so c-C4F8/CO2 mixtures are suggested to be possible substitutes for SF6.

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