Spatially resolved temperature measurement in the carbon dioxide arc under different gas pressures

Abstract

Carbon dioxide (CO) is a promising alternative to sulfur hexafluoride for high-voltage circuit breaker applications. It is important to have a detailed understanding of CO arc properties. In this paper, radial temperature distribution of the free burning direct current arc in pure CO was investigated. Optical emission spectrometry was applied under different pressures (0.5 atm, 1 atm, and 1.5 atm) and at different axial positions (1 mm, 2 mm, 3 mm above the cathode). Assuming local thermodynamic equilibrium, the Fowler-Milne method was adopted for O I 715.67 nm and O I 777.19 nm in the periphery of the arc, and the single-line method was adopted for C II 657.81 nm near the center of the arc. Radial temperature profiles obtained by these two methods were combined at the position where normal temperature was assigned. The results indicate that near the center of the arc, higher pressure would lead to lower temperature; as the distance from the cathode to the position measured increases, the maximum temperature in the arc center would decrease. In addition, the temperature would decrease more sharply toward the periphery if the central temperature of the arc is higher.

Detection of DC series arc in more electric aircraft power system based on optical spectrometry

“…For instance, the partial discharge spectrum in a gas-insulated switchgear or high-voltage power transformer can be analysed by light radiation [15][16][17], and optical image arc welding also has been investigated [18]. With regard to arc light, it has been recognised as a useful tool to judge the occurrence of arcing events or temperature distribution [19]. However, the decomposition products and discharge mechanism are mainly focused and discussed but not intended for arc fault detection.…”