| With the rapid development of power industry, the number of SF6 electrical equipment are increasing, it has gradually replaced the traditional insulating oil material as insulation and arc media in the high-voltage electrical equipment. Pure SF6 gas has excellent insulating properties and arc characteristics, however, under the effect of the strong arc, SF6 gas will decompose and generate toxic substances, then corroding electrical equipment, thereby affecting the insulation and arc ability of electrical equipment. If excessive levels of impurities in the gas that will seriously affect the mechanical properties, breaking performance and electrical performance of electrical equipment, it will cause many serious consequences, even threaten the safe operation of the grid.This paper main discuss the importance of detecting SF6 decomposition in the SF6 electrical equipment, presenting the research situation at home and abroad and development trend, analyzing of the basic properties of SF6 gas and the basic situation of decomposition in the discharge conditions. In order to simulate the actual high-voltage electrical equipment, designed and produced a simulation device that can simulate the decomposition of SF6 gas under a high voltage discharge. Finally, using gas chromatography-mass spectrometry and fourier transform infrared spectroscopy to qualitative and quantitative analysis the samples that produced by the simulation device. The results showed that the main discharge decomposition product is SO2F2 (sulfuryl fluoride), the substance can react with water and generate corrosive H2SO4 (sulfuric acid) and HF (hydrogen fluoride), also found that the increase in the number with the discharge, SO2F2 concentration levels are on the rise. Therefore, the material can be used as one of the main characteristic gases to determine the SF6 electrical equipment failure, and to monitor their concentration levels. |
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