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Chin. Phys. B, 2013, Vol. 22(3): 035101    DOI: 10.1088/1674-1056/22/3/035101
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

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)
Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
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.
Keywords:  effective ionization coefficient      electron drift velocity      insulation characteristics      CF3I gas mixtures  
Received:  02 June 2012      Revised:  25 July 2012      Accepted manuscript online: 
PACS:  51.50.+v (Electrical properties)  
  52.25.Mq (Dielectric properties)  
  52.80.-s (Electric discharges)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51177101).
Corresponding Authors:  Xiao Deng-Ming     E-mail:  dmxiao@sjtu.edu.cn

Cite this article: 

Deng Yun-Kun (邓云坤), Xiao Deng-Ming (肖登明) Effective ionization coefficients and electron drift velocities in gasmixtures of CF3I with N2 and CO2 obtained from Boltzmannequation analysis 2013 Chin. Phys. B 22 035101

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