Over Thermal Decomposition Characteristics of Environmental Insulating Medium $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ at Different Concentrations

Abstract

$\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ gas insulating medium has received universal attention by electrical industry for its superior environmental and insulating characteristics. As to the industrial application of $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$, due to the limit of saturated vapor pressure characteristic, it must be applied mixed with background gases in order to remain gaseous state in normal temperature, so its necessary to research how the ratio of $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ and background gas influence the physical, chemical and insulating properties. If different ratios of $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ itself can remain stable under long term over thermal failure is a significant factor of the industrial application. In this paper, we apply systematic researches on the existing gas insulating partial over thermal experimental platform, figure out the decomposition characteristics of 2%, 5% and 8% $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ with background gas He under several hours of highest temperature of $500^{\circ}\mathrm{C}$. Then a quantitative detection of the concentration changes of seven decomposition products is done, before analysis of their generation patterns. At last, we process the data and obtain total decomposition product and the proportion of total decomposition product, to characterize the thermal stability and degree of decomposition under different ratios. The production amount and gas production rate of each product vary differently with $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ ratio, but the proportion of total decomposition product reaches the peak when $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ is 5%, which means it has the worst thermal stability. The research results of this paper have laid a foundation for the industrial application of $\mathrm{C}_{5}\mathrm{F}_{10}\mathrm{O}$ gas.