Dynamic Detection of Decomposition Gases in Eco-Friendly C 5 F 10 O Gas-Insulated Power Equipment by Fiber-Enhanced Raman Spectroscopy.

Dynamic detection of multiple C 5 F 10 O decomposition gases can more comprehensively and effectively evaluate the operating status of eco-friendly gas-insulated power equipment (GIPE), which is a technical support for promoting the construction of eco-friendly, low-carbon energy power systems. In this article, we propose a silicon noise suppression fiber-enhanced Raman spectroscopy (FERS) technique and design a FERS sensing system for the dynamic detection of multiple C 5 F 10 O decomposition gases. Benefiting from the effective hybrid silicon noise filtering technology, the spectrum noise of FERS can be suppressed by 90% and the system detection sensitivity can be improved by 4.22 times. Utilizing a 2 m-long antiresonant hollow-core fiber, the system achieved detection limits of 1.34 and 1.44 ppmv for CF 4 and CO 2 , respectively, under the conditions of a laser power of 200 mW, a pressure of 0.5 MPa, and a measurement time of 120 s. Afterward, combining sample gas and density functional theory simulation, the characteristic peak positions for quantitative analysis of C 5 F 10 O decomposition gas were determined as follows: CF 4 : 906 cm -1 , CO 2 : 1388 cm -1 , C 5 F 10 O: 759 cm -1 , CF 2 O: 965 cm -1 , CF 3 H: 1117 cm -1 , C 2 F 4 : 517 cm -1 , C 2 F 6 : 807 cm -1 , C 3 F 6 : 767 cm -1 , C 3 F 8 : 780 cm -1 , C 3 F 7 H: 857 cm -1 , and C 4 F 10 : 770 cm -1 . Finally, the sensing system conducted dynamic measurements of the partial discharge decomposition gases of the C 5 F 10 O GIPE for 5 days with a 2 h measurement interval. The content trends of C 5 F 10 O and decomposition gases CF 4 , CO 2 , C 3 F 6 , and C 3 F 7 H were obtained. These results fully demonstrate the capability of FERS technology for dynamically detecting the decomposition gases of the C 5 F 10 O GIPE.