Optical Diagnostic Characterization of the Local Arc on Contaminated Insulation Surface at Low Pressure

Hao Yang, Haotian Zhang, Wen Cao, Xuanxiang Zhao, Ran Wen, Junping Zhao, Shengwu Tan and Pengchao Wang
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Hao Yang: School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, China
Haotian Zhang: School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, China
Wen Cao: School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, China
Xuanxiang Zhao: School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, China
Ran Wen: School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, China
Junping Zhao: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Shengwu Tan: Pinggao Group Company Limited, Pingdingshan 467000, China
Pengchao Wang: Pinggao Group Company Limited, Pingdingshan 467000, China

Energies, 2021, vol. 14, issue 19, 1-11

Abstract: Flashover of contaminated insulators is a major problem for power systems at high altitude. Laboratory experiments have shown that the optical diagnostic method can provide extensive information on the physical process of contamination flashover. In this paper, a study of the local arc on a wet polluted surface under low pressure by using the optical diagnostic method is presented. The thickness of the continuous spectrum, spectral line intensity and the spectral composition varies significantly in different stages of the local arc development. Thermodynamic parameters of the local arc (including electron temperature, electron density and conductivity) are obtained by analyzing the spectra. Both the electron temperature and the conductivity increase with the increase in leakage current and air pressure. Although the electron density does not change significantly with an increase in leakage current, it increases significantly with an increase in air pressure. The findings of this work could be used as supplementary information for the investigation of local arc parameters, thus providing a reliable reference for the calculation of contamination flashover at high altitude.

Keywords: contamination flashover; the local arc; low pressure; optical diagnostic method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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