Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub>
As one of the alternative insulation gases, C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> gas mixtures have attracted much attention recently. In this study, the normalized Townsend first ionization coefficient α/N and the normalized attachment coefficient...
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IEEE
2020-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9078084/ |
| _version_ | 1818854843152859136 |
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| author | Yunxiang Long Liping Guo Cheng Chen Zhenyu Shen Yiheng Chen Fang Li Wenjun Zhou |
| author_facet | Yunxiang Long Liping Guo Cheng Chen Zhenyu Shen Yiheng Chen Fang Li Wenjun Zhou |
| author_sort | Yunxiang Long |
| collection | DOAJ |
| description | As one of the alternative insulation gases, C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> 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<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> 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<sub>4</sub>F<sub>7</sub>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<sub>4</sub>F<sub>7</sub>N/91.00%CO<sub>2</sub> respectively. The results indicated that the (E/N)lim have not significant change on the SST experimental conditions. Meanwhile, a comparison with SF<sub>6</sub> gas indicates that 20.02% C<sub>4</sub>F<sub>7</sub>N/79.98% CO<sub>2</sub> has a similar insulation performance with (E/N)lim as 358.82 Td. However, when the liquefaction temperature is considered, the C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> gas mixtures with 9.00% C<sub>4</sub>F<sub>7</sub>N could be considered as an appropriate substitute gas for SF<sub>6</sub>, because the critical electric field of this gas mixture is over 70% of SF<sub>6</sub> gas and could be used under -15°C at 0.7 MPa. |
| first_indexed | 2024-12-19T07:59:09Z |
| format | Article |
| id | doaj.art-ae7af9a6973a42f990b1f561fa330c68 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-19T07:59:09Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-ae7af9a6973a42f990b1f561fa330c682022-12-21T20:29:55ZengIEEEIEEE Access2169-35362020-01-018767907679510.1109/ACCESS.2020.29903019078084Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub>Yunxiang Long0https://orcid.org/0000-0002-2257-0878Liping Guo1https://orcid.org/0000-0003-1987-8967Cheng Chen2Zhenyu Shen3Yiheng Chen4Fang Li5Wenjun Zhou6https://orcid.org/0000-0002-7532-9092Hubei Key Laboratory of Nuclear Solid Physics, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, ChinaHubei Key Laboratory of Nuclear Solid Physics, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, ChinaHubei Key Laboratory of Nuclear Solid Physics, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, ChinaHubei Key Laboratory of Nuclear Solid Physics, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, ChinaHubei Key Laboratory of Nuclear Solid Physics, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, ChinaHubei Key Laboratory of Nuclear Solid Physics, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, ChinaSchool of Electrical Engineering and Automation, Wuhan University, Wuhan, ChinaAs one of the alternative insulation gases, C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> 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<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> 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<sub>4</sub>F<sub>7</sub>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<sub>4</sub>F<sub>7</sub>N/91.00%CO<sub>2</sub> respectively. The results indicated that the (E/N)lim have not significant change on the SST experimental conditions. Meanwhile, a comparison with SF<sub>6</sub> gas indicates that 20.02% C<sub>4</sub>F<sub>7</sub>N/79.98% CO<sub>2</sub> has a similar insulation performance with (E/N)lim as 358.82 Td. However, when the liquefaction temperature is considered, the C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> gas mixtures with 9.00% C<sub>4</sub>F<sub>7</sub>N could be considered as an appropriate substitute gas for SF<sub>6</sub>, because the critical electric field of this gas mixture is over 70% of SF<sub>6</sub> gas and could be used under -15°C at 0.7 MPa.https://ieeexplore.ieee.org/document/9078084/C₄F₇N/CO₂ionization coefficientattachment coefficientcritical electric fieldsteady-state Townsend method |
| spellingShingle | Yunxiang Long Liping Guo Cheng Chen Zhenyu Shen Yiheng Chen Fang Li Wenjun Zhou Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub> IEEE Access C₄F₇N/CO₂ ionization coefficient attachment coefficient critical electric field steady-state Townsend method |
| title | Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub> |
| title_full | Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub> |
| title_fullStr | Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub> |
| title_full_unstemmed | Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub> |
| title_short | Measurement of Ionization and Attachment Coefficients in C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> Gas Mixture as Substitute Gas to SF<sub>6</sub> |
| title_sort | measurement of ionization and attachment coefficients in c sub 4 sub f sub 7 sub n co sub 2 sub gas mixture as substitute gas to sf sub 6 sub |
| topic | C₄F₇N/CO₂ ionization coefficient attachment coefficient critical electric field steady-state Townsend method |
| url | https://ieeexplore.ieee.org/document/9078084/ |
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