Ionization and attachment coefficients in C4F7N/N2 gas mixtures for use as a replacement to SF6

Long, Yunxiang; Guo, Liping; Shen, Zheyu; Chen, Cheng; Chen, Yiheng; Li, Fang; Zhou, Wenjun

doi:10.1109/tdei.2019.008066

Cited by 24 publications

(18 citation statements)

References 21 publications

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“…The experiments were carried out on an SST apparatus setup in Wuhan University, which the details have been described in previous work [18,19]. The reliability of this SST apparatus has been verified by experiments on known gases such as SF 6 and N 2 , which showed this SST apparatus has great measurement accuracy (<2%) [19].…”

Section: Methodsmentioning

confidence: 99%

“…The normalized effective ionization coefficient (α − η)/N of C 4 F 7 N, in a range of E/N from 750 to 1150 Td, at 20 • C was obtained as well. Figure 4 presents the value (α − η)/N as a function of E/N in C 4 F 7 N, and its comparisons with SF 6 [3], c-C 4 F 8 [4], CF 3 I [7], C 4 F 7 N [13,14], and C 4 F 7 N/N 2 mixtures [18] are reported. Notably, the E/N of C 4 F 7 N was much greater than other kinds of gases for the same (α − η)/N, which suggests that the insulation ability of C 4 F 7 N is much stronger.…”

Section: Effective Ionization Coefficientsmentioning

confidence: 99%

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Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

et al. 2019

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The normalized Townsend first ionization coefficient α/N and normalized attachment coefficient η/N in pure C4F7N were measured by using the steady-state Townsend (SST) method for a range of reduced electric fields E/N from 750 to 1150 Td at room temperature (20 °C). Meanwhile, the effective ionization coefficients are obtained. All SST experimental results show good agreement with pulsed Townsend (PT) experiment results. Comparisons of the critical electric fields of C4F7N with SF6 and other alternative gases such as c-C4F8 and CF3I indicate that C4F7N has a better insulation performance with a much higher normalized critical electric field at 959.19 Td.

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Section: Methodsmentioning

confidence: 99%

Section: Effective Ionization Coefficientsmentioning

confidence: 99%

Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

et al. 2019

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“…The measurements of the C 4 F 7 N/CO 2 mixtures were performed on the SST apparatus setup in Wuhan University [13], [14]. The accuracy of the measurement is less than 2%.…”

Section: Methodsmentioning

confidence: 99%

“…All equipment of the SST experimental platform have been verified by the Hubei Institute of Metrology and Testing Technology. As described in the previous work [13], the apparatus consist 5 parts, and the one of the important parts is the vacuum system. The background vacuum degree in the ionization chamber can reach approximately 1.0 × 10 −5 Pa at 20 • C. The low leak rate of pressure as 0.07 Pa/h guarantee the stable gas pressure as 500 ∼ 2000 Pa during the SST experiments.…”

Section: Methodsmentioning

confidence: 99%

“…In order to provide a comparison and evaluation of the insulation performance of these gases quantitatively, the results of critical electric fields (E/N ) lim in C 4 F 7 N/CO 2 mixtures are obtained by linear fitting due to the linear variation of (α−η)/N with E/N near (α−η)/N = 0, and the comparisons with that of C 4 F N/N 2 [13] gas mixtures as well as SF 6 [13] have been sorted into Table 1 and plotted in Figure 4. The strength of (E/N ) lim could indicate the insulation ability of insulation gases since when E/N is larger than (E/N ) lim , the gas shows the ionization characteristics of electrons.…”

Section: Critical Electric Field (E/n) Limmentioning

confidence: 99%

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Measurement of Ionization and Attachment Coefficients in C₄F₇N/CO₂ Gas Mixture as Substitute Gas to SF₆

et al. 2020

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As one of the alternative insulation gases, C 4 F 7 N/CO 2 gas mixtures have attracted much attention recently. In this study, the normalized Townsend first ionization coefficient α/N and the normalized attachment coefficient η/N were measured in C 4 F 7 N/CO 2 gas mixtures by using the Steady-State Townsend (SST) method over a range of electric fields E/N from 100 to 550 Td. The concentrations of C 4 F 7 N studied were 4.99, 7.00, 9.00, 13.13 and 20.02%, and the gas pressure were 500 Pa at 20 • C. The effective ionization coefficients and the critical electric field were obtained at 500, 1000 and 2000 Pa to investigate the effect of gas pressure on dielectric strength in 9.00%C 4 F 7 N/91.00%CO 2 respectively. The results indicated that the (E/N) lim have not significant change on the SST experimental conditions. Meanwhile, a comparison with SF 6 gas indicates that 20.02% C 4 F 7 N/79.98% CO 2 has a similar insulation performance with (E/N) lim as 358.82 Td. However, when the liquefaction temperature is considered, the C 4 F 7 N/CO 2 gas mixtures with 9.00% C 4 F 7 N could be considered as an appropriate substitute gas for SF 6 , because the critical electric field of this gas mixture is over 70% of SF 6 gas and could be used under-15 • C at 0.7 MPa. INDEX TERMS C 4 F 7 N/CO 2 , ionization coefficient, attachment coefficient, critical electric field, steady-state Townsend method.

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Cage-molecule based metal-organic framework nanosheets in mixed matrix membranes: Enhanced compatibility and perfluoroisobutyronitrile gas separation performance

Sun,

Wu,

Lin

et al. 2025

Journal of Membrane Science

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Ionization and attachment coefficients in C₄F₇N/N₂ gas mixtures for use as a replacement to SF₆

Cited by 24 publications

References 21 publications

Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

Measurement of Ionization and Attachment Coefficients in C₄F₇N/CO₂ Gas Mixture as Substitute Gas to SF₆

Cage-molecule based metal-organic framework nanosheets in mixed matrix membranes: Enhanced compatibility and perfluoroisobutyronitrile gas separation performance

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Ionization and attachment coefficients in C4F7N/N2 gas mixtures for use as a replacement to SF6

Cited by 24 publications

References 21 publications

Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

Measurement of Ionization and Attachment Coefficients in C4F7N/CO2 Gas Mixture as Substitute Gas to SF6

Cage-molecule based metal-organic framework nanosheets in mixed matrix membranes: Enhanced compatibility and perfluoroisobutyronitrile gas separation performance

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Product

Resources

About

Ionization and attachment coefficients in C₄F₇N/N₂ gas mixtures for use as a replacement to SF₆

Measurement of Ionization and Attachment Coefficients in C₄F₇N/CO₂ Gas Mixture as Substitute Gas to SF₆