Simulation and experiment on SF6 gas decomposition detection based on infrared absorption spectroscopy

摘要

Online monitoring of SF₆ decomposition products is one of the important methods for GIS to implement status evaluation and fault diagnosis. With many advantages such as good anti-interference ability, rapid detection, high sensitivity and non-contact measurement, etc., infrared absorption spectroscopy is very suitable for field detection and long-term monitoring. In this paper, the IR is used to analyze SF₆ decomposition products, and the application of IR in SF₆ decomposition products is also studied. Firstly, the infrared absorption characteristic spectra of SF₆ and its decomposition product are simulated, and the IR typical spectrum of three kinds of target gas (CO, SO₂ and H₂S) are obtained. Meanwhile, the SF₆ decomposition products detection system based on FTIR is designed, and using this detection system tests the experiment gas. The results show that this detection system can qualitatively and quantitatively analyze SF₆ decomposition products, which lays the foundation for SF₆ decomposition products online monitoring with IR in GIS.