Dynamic Detection of Decomposition Gases in Eco-Friendly C<sub>5</sub>F<sub>10</sub>O Gas-Insulated Power Equipment by Fiber-Enhanced Raman Spectroscopy
Weiping Kong, Fu Wan, Lei Yu, Changding Wang, Hongcheng Sun, Rui Wang, Weigen Chen
Abstract
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.