Decomposition Characteristics of C5F10O Mixtures under Corona Discharge
Zhou Zhenrui1,2, Han Dong1,2, Zhao Mingyue1,2, Zhang Guoqiang1,2
1. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China;
2. University of Chinese Academy of Sciences Beijing 100049 China
C5F10O, a potential SF6 alternative gas, has high dielectric strength and low GWP. However, there are few studies on the decomposition characteristics of C5F10O. Based on density functional theory, the decomposition pathways of C5F10O were analyzed. The calculation shows that the formation of fluorocarbon decomposition products is related to the recombination or decomposition reaction of CF3、F、C3F7 and other radicals. Furthermore, a series of AC corona discharge experiments on C5F10O/air and C5F10O/N2 mixed gases were carried out, and GC-MS was used to detect the decomposition products. The concentration variation of fluorocarbon gas, carbon-oxygen gas and nitrile gas with the gas mixing ratio and the applied voltage was investigated. The results show that the main by-products of the two mixed gases are CO, CO2, CF4, C2F6, C3F8, C2F4 and C3F6. The total content of fluorocarbon gases, the content of CO and the content of CO2 are positively related to the mixing ratio of C5F10O and the applied voltage. From the perspective of application conditions and reduction of the types and toxicity of decomposition products, air with a ratio of 93.5%~96% is more suitable as a buffer gas for C5F10O.
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