AC Breakdown and Decomposition Characteristics of Environmental Friendly Gas C5F10O/Air and C5F10O/N2

C
₅
F
₁₀
O (C5 perfluorinatedketone) has received extensive attention due to its great insulation and eco-friendly performance, which has the potential to replace SF
₆
usage in power industries. In this paper, the power–frequency breakdown properties and discharge decomposition characteristics of C
₅
F
₁₀
O/Air and C
₅
F
₁₀
O/N
₂
gas mixtures are explored. It is found that the AC breakdown voltage of the C
₅
F
₁₀
O gas mixtures increases gradually with both the gas pressure and the content of C
₅
F
₁₀
O. As the partial pressure of C
₅
F
₁₀
O increases, the relative insulation strength increasing trend of the C
₅
F
₁₀
O gas mixtures becomes less obvious with the increase in the gas pressure. The AC breakdown voltage of the C
₅
F
₁₀
O/Air gas mixture is higher than that of the C
₅
F
₁₀
O/N
₂
gas mixture. In addition, the decomposition products of the C
₅
F
₁₀
O gas mixtures are mainly CF
₄
, C
₂
F
₆
, C
₃
F
₈
, C
₄
F
₁₀
, and C
₃
F
₇
H. Under the same condition, the content of the CF
₄
in C
₅
F
₁₀
O/Air gas mixture is higher than that of the C
₅
F
₁₀
O/N
₂
gas mixture. The decomposition of the C
₅
F
₁₀
O/Air gas mixture after breakdown did not produce C
₂
F
₄
and C
₃
F
₆
. CF
₂
O and CO
₂
are not detected in the C
₅
F
₁₀
O/N
₂
gas mixture. Moreover, the carbon precipitation on the electrodes’ surface can be found for the C
₅
F
₁₀
O/N
₂
gas mixture after 60 breakdown tests.