Mr. Shun-gui Liu Profile

Shun-gui Liu

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Proceedings Article | 20 November 2019 Paper

Experimental study on the detection of trace H2S and H2O in high-voltage combination appliances based on TDLAS technology

Feng Tang, Shungui Liu, Qishen Lv, Xintian Li, Shukai He, Xiaozhe Zeng, Yunqi Yue

Proceedings Volume 11191, 1119104 (2019) https://doi.org/10.1117/12.2537651

KEYWORDS: Absorption, Molecules, Modulation, Signal to noise ratio, Hydrogen, Denoising

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H₂S and moisture content are important indicators to evaluate the potential faults and insulation performance of H₂S electrical appliances. Currently, there is no report on the simultaneous detection of H₂S gas and moisture content. In order to realize the accurate detection of H₂S gas and H₂O at the same time, Lorentz simulation analysis was performed on the absorption spectra of H₂S gas and H₂O molecules. The absorption was strongest near 2684nm, and there was no cross interference of SF₆ other decomposition products. H₂S and moisture content at different concentrations were measured by TDLAS technology in a customized CW-DFB laser with a central wavelength of 2.68μm combined with a small-volume Herriott long-range cell with multiple reflections. In order to verify the detection ability of selected spectral lines to H₂S gas and H₂O molecules at low concentration, trace H₂S and H₂O vapor with SF₆ as background were detected by direct absorption technology and wavelength modulation technology respectively. In the second harmonic absorption, the minimum detection lower limit of H₂S and H₂O is 9.01×10^-6 and 4.54×10^-6, respectively. The maximum harmonic signal amplitude has a good linear correlation with concentration, and the linear fitting degree R² is 0.978 and 0.997, respectively. SF₆ gas displacement experiments with different flow rates showed that the equilibrium time of H₂S and moisture content at 708mL/min was 90s and 100s, respectively. The response time of H₂S and H₂O at the same concentration and injection velocity is 30s and 45s, respectively. Wavelength modulation technology can provide a reliable experimental basis for the simultaneous detection of trace H₂S and H₂O in high voltage combination electrical appliances.

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