Abstract
With its high insulation capability and excellent environmental friendliness, CF 3 I has been considered as a potential substitute to SF 6 . However, considering its high boiling point, CF 3 I should be mixed with buffer gases such as CO 2 or N 2 . In this paper, breakdown performance of CF 3 I/N 2 gas mixtures, SF 6 /N 2 gas mixtures and pure SF 6 gas in uniform field are investigated, with negative dc voltage or negative lightning impulse voltage applying. DC breakdown experiments of pure CF 3 I gas and pure SF 6 gas show that the dielectric strength of CF 3 I is not always higher than that of SF 6 . The insulation experimental results show that in low pressures, 30%CF 3 I/70%N 2 gas mixtures present similar insulation properties as 20%SF 6 /80%N 2 gas mixtures. Considering liquefaction temperature and insulation properties, 30%CF 3 I/70%N 2 gas mixtures could be possible substitutes to SF 6 or SF 6 /N 2 gas mixtures in low pressures, and it is significant to study their insulation strength in higher pressures.
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