Study on thermal decomposition characteristics of environmentally friendly insulating medium C5F10O and C5F10O/air mixture

In recent years, C
5
F
10
O is considered to be one of the most potential candidate gas for SF
6
in gas insulation equipment because of its excellent electrical performance and environmental protection advantages. However, there are few studies on the decomposition of C
5
F
10
O and its mixture with air. In this paper, the decomposition characteristics of C
5
F
10
O and C
5
F
10
O-air mixtures were studied on the established thermal decomposition simulation experimental platform. Gas chromatography-mass spectrometry was used to detect the decomposition products. With the increase of temperature, the decomposition of C
5
F
10
O increases. The main decomposition products are CF
4
, CO
2
, C
2
F
6
, CF
2
O, C
3
F
8
, C
4
F
10
, C
4
F
10
O, C
4
F
8
O, etc. With the increase of temperature, the type and content of decomposition products increase. The results show that the mixture of C
5
F
10
O and C
5
F
10
O-air has good thermal stability at 300 °C. Decomposition of C
5
F
10
O increases with the increase of temperature, and the types of decomposition products increase. O
2
in C
5
F
10
O-air mixture is involved in the decomposition reaction, and CO
2
is the main product and causes the chamber pressure to rise. At the same time, the research results can provide reference for the application of air as a buffer gas of C
5
F
10
O.