Concentrated injection method for the improved sensitivity in detecting the decomposed products of SF₆

A concentrated injection method for detecting SO2, H2S, SO2F2 and SOF2 in sulfur hexafluoride (SF6) based on Gas Chromatography-Mass Spectrometer (GC-MS) measurements has been proposed and developed. The peak intensity of the component obtained by concentrated injection method for detecting 1 μL/L SO2 was 20 times larger than that estimated by ordinary injection method, indicating a higher sensitivity, and a lower detection limit as well. This work shows advantages for the pre-warning of pitfall in electrical equipment, and effectively improves the safety and reliability of the grid.