Plasma Sci. Technol.
  2019,Vol. 21(7): 74008-074008
  2018 National Conference on High Voltage and Discharge Plasmas
Study of spatial and temporal evolution of Ar and F atoms in SF6/Ar microsecond pulsed discharge by optical emission spectroscopy
doi: 10.1088/2058-6272/ab0c46
Study of spatial and temporal evolution of Ar and F atoms in SF6/Ar microsecond pulsed discharge by optical emission spectroscopy
Hongyue LI (李红月), Xingwei WU (吴兴伟), Cong LI (李聪), Yong WANG (王勇), Ding WU (吴鼎), Jiamin LIU (刘佳敏), Chunlei FENG (冯春雷) and Hongbin DING (丁洪斌)
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, People’s Republic of China
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Abstract:

The study of sulfur hexafluoride (SF6) discharge is vital for its application in gas-insulated equipment. Direct current partial discharge (PD) may cause SF6 decomposition, and the decomposed products of SF6, such as F atoms, play a dominant role in the breakdown of insulation systems. In this study, the PD caused by metal protrusion defects is simulated by a needle-plate electrode using pulsed high voltage in SF6/Ar mixtures. The spatial and temporal characteristics of SF6/Ar plasma are analyzed by measuring the emission spectra of F and Ar atoms, which are important for understanding the characteristics of PD. The spatial resolved results show that both F and Ar atom spectral intensities increase first from the plate anode to the needle and then decrease under the conditions of a background pressure of 400 Pa, peak voltage of −1000 V, frequency of 2 kHz, pulse width of 60 μs, and electrode gap of 5–9 mm. However, the distribution characteristics of F and Ar are significantly different. The temporal distribution results show that the spectral intensity of Ar decreases first and then increases slowly, while the spectral intensity of F increases slowly for the duration of the pulsed discharge at the electrode gap of 5 mm and the pulse width of 40–80 μs.

Key words: optical emission spectroscopy,  partial discharge,  SF6-insulated equipment,  spatial and temporal evolution 
Received: 14 November 2018    
Fund:

This work was supported by National Natural Science Foundation of China (Nos. 11605023, 11805028, and 11705020), the National Key R&D Program of China (No. 2017YFE0301300), the China Postdoctoral Science Foundation (Nos. 2017T100172 and 2016M591423), and the Fundamental Research Funds for the Central Universities (Nos. DUT17RC(4)53 and DUT18LK38).