Dynamic Detection of Decomposition Gases in Eco-Friendly C₅F₁₀O Gas-Insulated Power Equipment by Fiber-Enhanced Raman Spectroscopy

Abstract

Dynamic detection of multiple C₅F₁₀O 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 C₅F₁₀O 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 CF₄ and CO₂, 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 C₅F₁₀O decomposition gas were determined as follows: CF₄: 906 cm^-1, CO₂: 1388 cm^-1, C₅F₁₀O: 759 cm^-1, CF₂O: 965 cm^-1, CF₃H: 1117 cm^-1, C₂F₄: 517 cm^-1, C₂F₆: 807 cm^-1, C₃F₆: 767 cm^-1, C₃F₈: 780 cm^-1, C₃F₇H: 857 cm^-1, and C₄F₁₀: 770 cm^-1. Finally, the sensing system conducted dynamic measurements of the partial discharge decomposition gases of the C₅F₁₀O GIPE for 5 days with a 2 h measurement interval. The content trends of C₅F₁₀O and decomposition gases CF₄, CO₂, C₃F₆, and C₃F₇H were obtained. These results fully demonstrate the capability of FERS technology for dynamically detecting the decomposition gases of the C₅F₁₀O GIPE.