| Abstract:SF6 gas-insulated equipment is widely used in power systems, and overheating faults during equipment operation can threaten their safety, necessitating research on fault level determination. In this paper, the SF6 gas decomposition characteristics under inaccessible overheating fault are studied, and the effects of heating time and barometric pressure on SF6 decomposition products are analyzed. The results show that the decomposition products under superheat conditions are mainly CO, CO2, SO2, SOF2, SO2F2, COS and H2S; the product content shows an increasing trend with temperature and barometric pressure, and the gas content size results satisfy: SO2>SOF2>SO2F2>CO2>CO>H2S>COS; a triangular diagnosis method with SO2, (SOF2+CO) and (SO2F2+H2S+CO2) as content ratios is constructed based on the idea of characteristic ratio, which can realize an effective judgment of the severity of metallic overheating faults. |
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