Review on Decomposition Characteristics of SF6 Alternative Gases
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
Abstract：SF6 is an excellent insulating gas which is widely used in gas-insulated electrical equipment. However, SF6 has high global warming potential and poor environmental performance. In order to fundamentally eliminate the usage of SF6, it is vital to develop SF6 replacement technology. Most of the potential SF6 alternative gases are carbon-containing compounds. Due to different gas mixing schemes and faults, the variety of gas or solid decomposition products and their variations are quite different, which not only affect the choices of buffer gas, absorbent and solid material, but also are important foundations for the diagnosis of gas-insulated electrical equipment faults based on gas decomposition method. Therefore, from the perspective of decomposition characteristics, this paper introduces the domestic and international research progress on decomposition characteristics of several potential SF6 alternative gases, compares the decomposition characteristics under different experimental conditions in various literatures and summarizes the possible decomposition paths. On this basis, this paper makes a panoramic outlook on SF6 replacement technology from the aspects of environmental protection, toxicity, buffer gas, chemical deposits, absorbent and fault diagnosis.
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2020, Vol. 35 
