中国物理B ›› 2013, Vol. 22 ›› Issue (3): 35101-035101.doi: 10.1088/1674-1056/22/3/035101

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Effective ionization coefficients and electron drift velocities in gasmixtures of CF3I with N2 and CO2 obtained from Boltzmannequation analysis

邓云坤, 肖登明   

  1. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
  • 收稿日期:2012-06-02 修回日期:2012-07-25 出版日期:2013-02-01 发布日期:2013-02-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51177101).

Effective ionization coefficients and electron drift velocities in gasmixtures of CF3I with N2 and CO2 obtained from Boltzmannequation analysis

Deng Yun-Kun (邓云坤), Xiao Deng-Ming (肖登明)   

  1. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
  • Received:2012-06-02 Revised:2012-07-25 Online:2013-02-01 Published:2013-02-01
  • Contact: Xiao Deng-Ming E-mail:dmxiao@sjtu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51177101).

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摘要： The electron swarm parameters including the density-normalized effective ionization coefficients (α-η)/N and the electron drift velocities Ve are calculated for the gas mixture of CF3I with N2 and CO2 by solving the Boltzmann equation in the condition of steady-state Townsend (SST) experiment. The overall density-reduced electric field strength is from 100 Td to 1000 Td (1 Td=10-17 V·cm2), while the CF3I content k in the gas mixture can be varied over the range from 0% to 100%. From the variation of (α-η)/N with the CF3I mixture ratio k, the limiting field strength (E/N)lim for each CF3I concentration is derived. It is found that for the mixtures with 70% CF3I, the values of (E/N)lim are essentially the same as that for pure SF6. Additionally, the global warming potential (GWP) and the liquefaction temperature of the gas mixtures are also taken into account to evaluate the possibility of applying in the gas insulation of power equipment.

关键词: effective ionization coefficient, electron drift velocity, insulation characteristics, CF3I gas mixtures

Abstract: The electron swarm parameters including the density-normalized effective ionization coefficients (α-η)/N and the electron drift velocities Ve are calculated for the gas mixture of CF3I with N2 and CO2 by solving the Boltzmann equation in the condition of steady-state Townsend (SST) experiment. The overall density-reduced electric field strength is from 100 Td to 1000 Td (1 Td=10-17 V·cm2), while the CF3I content k in the gas mixture can be varied over the range from 0% to 100%. From the variation of (α-η)/N with the CF3I mixture ratio k, the limiting field strength (E/N)lim for each CF3I concentration is derived. It is found that for the mixtures with 70% CF3I, the values of (E/N)lim are essentially the same as that for pure SF6. Additionally, the global warming potential (GWP) and the liquefaction temperature of the gas mixtures are also taken into account to evaluate the possibility of applying in the gas insulation of power equipment.

Key words: effective ionization coefficient, electron drift velocity, insulation characteristics, CF3I gas mixtures

中图分类号:  (Electrical properties)

  • 51.50.+v
52.25.Mq (Dielectric properties) 52.80.-s (Electric discharges)