Decomposition Properties of Trifluoroiodomethane under Discharges and Interruptions

  • Cai, Fan-Yi (NARI Group Corp., State Grid Electric Power Research Institute) ;
  • Tan, Dong-Xian (Dept. of Electrical Engineering, Shanghai Jiao Tong University) ;
  • Zhou, Bai-Jie (NARI Group Corp., State Grid Electric Power Research Institute) ;
  • Xue, Jian (NARI Group Corp., State Grid Electric Power Research Institute) ;
  • Xiao, Deng-Ming (Dept. of Electrical Engineering, Shanghai Jiao Tong University)
  • Received : 2018.05.23
  • Accepted : 2018.08.27
  • Published : 2018.11.01


This paper is devoted to detecting decomposition characteristics of Iodotrifluoromethane ($CF_3I$) under alternating current (AC) discharges or load current interruptions. The decomposition products are measured utilizing chromatography-mass spectroscopy. It is found that less than 1% $CF_3I$ gas decomposed after several interruptions at load current of 200 A or hundred times of AC discharges. However, under interruptions at a current of 400 A, more than 95% $CF_3I$ gas decomposed into carbon tetrafluoride ($CF_4$) and hexafluoroethane ($C_2F_6$). The equilibrium compositions based on Gibbs free energy minimization of $CF_3I$ was calculated to explain the decomposition mechanism.


Grant : Research on SF6 Alternative Gas for Insulation and Arc Quenching Application

Supported by : SGCC


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