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Emission spectrum characteristics of SF6 plasma based on femtosecond laser-guided high-voltage discharge

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Abstract

The detection of SF6 decomposition products can determine the type of gas-insulated equipment failure and the degree of damage. However, the existing sampling-based detection methods cannot avoid the conversion of decomposition products, which leads to the inability to accurately establish a decomposition mechanism and diagnose insulation faults based on the decomposition products. An in situ measurement method of SF6 decomposition products is proposed to study the decomposition characteristics of SF6 under high-voltage discharge. First, femtosecond laser-guided high-voltage discharge is used to realize the precise control of high-voltage discharge in space and time. Space-resolved spectra generated by femtosecond laser-guided high-voltage discharge are obtained to realize the composition measurement of SF6 decomposition products. Second, the SF6 discharge decomposition spectra are obtained under different discharge voltages to study the effects of discharge voltages on decomposition products. Finally, the electron temperature and electron density of SF6 plasma are studied at different voltages, the experimental results indicate that the maximum difference in excitation energy between the upper and lower energy levels of the spectral line is 1.93 eV, and the maximum electron temperature is 2519 K. Besides, the minimum electron density satisfying the LTE is \(0.58\, \times \,10^{17} \,{\text{cm}}^{{ - 3}}\), and the minimum electron density obtained in the experiment is \(7\, \times \,10^{17} \,{\text{cm}}^{{ - 3}}\). It is observed that the increasing discharge voltage can cause the electron density and electron temperature to increase linearly and decrease linearly, respectively, suggesting that the SF6 plasma is in local thermal equilibrium based on the Mc Whirter criterion.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 62175208 and 518061495) and the Central Government Guides Local Science and Technology Development Foundation (Grant No. 216Z1701G) and the Natural Science Foundation of Hebei Province (Grant No. F2021203052).

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Authors and Affiliations

  1. College of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, China

    Yungang Zhang, Zheng Lu, Huangtao Liu & Xijun Wu

  2. State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China

    Qiang Gao & Bo Li

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  1. Yungang Zhang
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  2. Zheng Lu
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Correspondence to Yungang Zhang.

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Zhang, Y., Lu, Z., Liu, H. et al. Emission spectrum characteristics of SF6 plasma based on femtosecond laser-guided high-voltage discharge. Appl. Phys. B 128, 81 (2022). https://doi.org/10.1007/s00340-022-07806-x

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