Over Thermal Decomposition Characteristics of C₅F₁₀O: An Environmental Friendly Insulation Medium

Abstract

C 5 F 10 O gas insulating medium has attracted wide attention in the power industry for its excellent environmental potential and insulation performance. When C 5 F 10 O gas is applied in power industry engineering, it will inevitably face the over thermal fault which often occurs inside the equipment. Under the long-term effect of the local over thermal fault, whether C 5 F 10 O itself can maintain stability is an important factor to determine its engineering application. However, the thermal stability characteristics of C 5 F 10 O and its mixture are still unknown. Therefore, through systematic experimental research on the existing experimental platform of partial over thermal of the gas insulating medium, this paper explores the initial decomposition temperature of 5% C 5 F 10 O and 95% CO 2 mixture, the formation conditions of decomposition components, the relationship between the generation characteristics of decomposition components and fault temperature, and so on. The results show that when the pressure of 5% C 5 F 10 O and 95% CO 2 is 0.2MPa, the mixture begins to decompose at about 400 • to form C 3 F 8 and C 3 F 6 . C 2 F 6 and CF 4 will be produced at above 500 • . The process of C 3 F 6 formation is the endothermic reaction, while the process of C 3 F 8 , C 2 F 6 and CF 4 formation is an exothermic reaction, which is very beneficial to the formation of C3F6 un-der superheated conditions. As a result, the product concentration shows as C 3 F 6 > C 3 F 8 >C 2 F 6 >CF 4 , and the rate of product formation is positively correlated with the over thermal fault temperature. The results of this study lay a foundation for the application of C 5 F 10 O gas in the electric industry.INDEX TERMS Environmental friendly insulating medium, C 5 F 10 O, thermal stability, over thermal decomposition characteristics.

Review on decomposition characteristics of eco-friendly gas insulating medium for high voltage gas insulated equipment

“…In addition, Zeng et al carried out local overheating decomposition tests for a 5%C 5 F 10 O-95%CO 2 gas mixture and found that the initial decomposition temperature was higher than 375 • C. Generation of C 3 F 8 and C 3 F 6 was found at 400 • C, while CF 4 and C 2 F 6 were produced when the temperature reached 500 • C and 525 • C, respectively. The content of decomposition products increased with temperature [121,122]. Li et al reported that a C 6 F 12 O-CO 2 mixture started to decompose at temperatures above 475 • C, mainly producing CF 4 , C 2 F 6 , C 3 F 8 , C 3 F 6 and C 5 F 12 .…”

Review of the decomposition characteristics of eco‐friendly insulation gas

“…The process of C 3 F 8 , C 2 F 6 , CF 4 and other components formation was an exothermic reaction, while the process of C 3 F 6 formation was an endothermic reaction, which is very beneficial for the formation of C 3 F 6 under overheating conditions. As a result, the product concentration was C 3 F 6 > C 3 F 8 > C 2 F 6 > CF 4 , and the rate of product formation was positively correlated with the temperature [60]. -743 C 5 F 10 O/Air and C 5 F 10 O/N 2 gas mixtures with 15 kPa C 5 F 10 O at 0.2 MPa after 60 breakdown tests were measured by GC-MS, and the decomposition products were mainly CF 4 , C 2 F 6 , C 3 F 8 , C 4 F 10 and C 3 F 7 H. The content of CF 4 in the C 5 F 10 O/air gas mixtures was higher than that in C 5 F 10 O/N 2 gas mixtures.…”

“…The process of C 3 F 8 , C 2 F 6 , CF 4 and other components formation was an exothermic reaction, while the process of C 3 F 6 formation was an endothermic reaction, which is very beneficial for the formation of C 3 F 6 under overheating conditions. As a result, the product concentration was C 3 F 6 > C 3 F 8 > C 2 F 6 > CF 4 , and the rate of product formation was positively correlated with the temperature [60].…”

Degradation Behaviors and Mechanism of Nitrile Butadiene Rubber Caused by Insulating Medium C5F10O

“…However, compared with SF 6 , which possesses a simple and symmetrical molecular structure, C 5 F 10 O has poorer chemical stability. It is more likely to interact with various materials inside the switchgear under the action of electricity or heat [ 12 ]. The interaction can lead to deterioration of various materials in the switchgear, including metal electrodes, solid insulation materials and sealing rubber.…”