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.
Highlights
Line insulators are some of the most widely used components in transmission lines, and their performance directly affects the safe operation of power systems
(B-X), the relationship between the rotation temperature of the local arc and the leakage current was obtained, and the results show that the local arc rotation temperature increases with the increase in the leakage current amplitude [21,22]
We can still consider our proposed of the spectral diagnostic method, is method, which is relatively effectiveapproach in measuring the local arc conductivity underwhich low air relatively effective in measuring the local arc conductivity under low air pressure
Summary
Line insulators are some of the most widely used components in transmission lines, and their performance directly affects the safe operation of power systems. In high-altitude areas, the contamination flashover voltage of the line insulators is greatly reduced due to the lower air pressure [12,13]. Contamination flashover is the process in which the local arc develops on the surface of the insulator, until the high-voltage electrode and ground electrode are connected [16,17]. It can be concluded that thermodynamic parameters of the local arc play a very important role in calculating the arc characteristics and predicting the flashover voltage. There is a lack of research on the thermodynamic parameters of the local arc on the wet contaminated insulation surface under low pressure. Typical parameters including electron temperature, electron density and conductivity are obtained by analyzing the spectra of the local arc. This work can enrich the investigation of the local arc under low pressure and may provide useful parameters for the calculation of flashover voltage
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