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

Area of Science:

• Materials Science
• Spectroscopy
• Environmental Engineering

Background:

• Dynamic detection of decomposition gases in eco-friendly gas-insulated power equipment (GIPE) is crucial for evaluating operational status.
• Existing methods may lack the comprehensive and effective capabilities needed for promoting eco-friendly, low-carbon energy systems.
• C5F10O is an eco-friendly alternative gas used in GIPE, and monitoring its decomposition products is vital for equipment health.

Purpose of the Study:

• To propose and design a fiber-enhanced Raman spectroscopy (FERS) sensing system for the dynamic detection of multiple C5F10O decomposition gases.
• To enhance the sensitivity and reduce spectral noise in FERS for more accurate gas analysis.
• To establish characteristic peak positions for quantitative analysis of various C5F10O decomposition products.

Main Methods:

• Development of a silicon noise suppression fiber-enhanced Raman spectroscopy (FERS) technique.
• Design of a FERS sensing system incorporating a 2 m-long antiresonant hollow-core fiber.
• Utilized hybrid silicon noise filtering technology to suppress spectrum noise and improve detection sensitivity.
• Combined sample gas analysis and density functional theory (DFT) simulations to determine characteristic Raman peaks.

Main Results:

• Spectrum noise of FERS was suppressed by 90%, and system detection sensitivity was improved by 4.22 times.
• Achieved detection limits of 1.34 ppmv for CF4 and 1.44 ppmv for CO2 under specific experimental conditions (200 mW laser power, 0.5 MPa pressure, 120 s measurement time).
• Identified characteristic peak positions for 11 C5F10O decomposition gases, including CF4, CO2, CF2O, CF3H, C2F4, C2F6, C3F6, C3F8, C3F7H, C4F10, and C5F10O.
• Successfully conducted 5-day dynamic measurements of partial discharge decomposition gases in C5F10O GIPE, obtaining content trends for key gases.

Conclusions:

• The developed silicon noise suppression FERS system demonstrates high sensitivity and noise reduction capabilities for detecting C5F10O decomposition gases.
• The system is capable of dynamically monitoring the operational status of C5F10O GIPE by analyzing its decomposition products.
• This FERS technology provides a robust technical support for promoting the construction of eco-friendly and low-carbon energy power systems.