Arc erosion studies are conducted on AgSnO2 contact materials at different stages in the break operation. A resistive load arrangement is used with up to 42 V DC at 24 A and a constant contact opening velocity. The ar...Arc erosion studies are conducted on AgSnO2 contact materials at different stages in the break operation. A resistive load arrangement is used with up to 42 V DC at 24 A and a constant contact opening velocity. The arc current is terminated at different stages as the arc is drawn between the contacts enabling a study of the arcing phenomena up to that point. Surface profiling of the contacts is conducted to determine the extent of erosion at the different stages as the arc is drawn. Spectral analysis is also conducted on the arc and then related to the extent of erosion. The results show that particular features occur at different stages as the arc is drawn. As the arc is initially established, it goes through an ＂Arc Generation＂ regime where the arc roots are small and immobile on both the anode and the cathode. Material transfer occurs mainly from anode to cathode. The spectral analysis indicates that Sn and O species dominate the arc followed by the Ag species. As the arc is drawn further and enters the ＂Arc Degeneration＂ regime, the anode undergoes significantly larger erosion than the cathode. Also, both contacts indicate that multiple arc roots have formed, which are highly mobile in the later stages of the discharge. The spectral analysis indicates that Ag and N species are in high concentrations compared to other species. The mechanisms of erosion and deposition are discussed in relation to the species within the arc discharge. For the complete break operation, it is found that the anode undergoes major erosion, and it is thought that the gaseous ions species do not dominate the arc under these conditions of short arcs and voltage 〈42 V to cause cathode erosion.展开更多
动态回路电阻是一种免拆卸的触头烧蚀情况诊断方法,在不同幅值的回路电流下测得的动态回路电阻差异很大。为了研究试验电流对动态回路电阻的影响,分别测量了两套电磨损程度不同的触头系统在不同试验电流下的动态回路电阻信号,分析了动...动态回路电阻是一种免拆卸的触头烧蚀情况诊断方法,在不同幅值的回路电流下测得的动态回路电阻差异很大。为了研究试验电流对动态回路电阻的影响,分别测量了两套电磨损程度不同的触头系统在不同试验电流下的动态回路电阻信号,分析了动态回路电阻特征量的变化规律,研究了试验电流对动态回路电阻的影响原理。研究表明提高测量电流不仅有利于弧触头行程的确定,减小动态主回路电阻与弧触头电阻,还可以减小电阻曲线的波动,减小特征量的分散度。上述现象主要是由试验电流引起的触点温度升高造成。当试验电流范围为0.7~1 k A,试验结果比较稳定,且不会烧蚀触头。展开更多
基金Barnbrook Systems, UK for their support of this work
文摘Arc erosion studies are conducted on AgSnO2 contact materials at different stages in the break operation. A resistive load arrangement is used with up to 42 V DC at 24 A and a constant contact opening velocity. The arc current is terminated at different stages as the arc is drawn between the contacts enabling a study of the arcing phenomena up to that point. Surface profiling of the contacts is conducted to determine the extent of erosion at the different stages as the arc is drawn. Spectral analysis is also conducted on the arc and then related to the extent of erosion. The results show that particular features occur at different stages as the arc is drawn. As the arc is initially established, it goes through an ＂Arc Generation＂ regime where the arc roots are small and immobile on both the anode and the cathode. Material transfer occurs mainly from anode to cathode. The spectral analysis indicates that Sn and O species dominate the arc followed by the Ag species. As the arc is drawn further and enters the ＂Arc Degeneration＂ regime, the anode undergoes significantly larger erosion than the cathode. Also, both contacts indicate that multiple arc roots have formed, which are highly mobile in the later stages of the discharge. The spectral analysis indicates that Ag and N species are in high concentrations compared to other species. The mechanisms of erosion and deposition are discussed in relation to the species within the arc discharge. For the complete break operation, it is found that the anode undergoes major erosion, and it is thought that the gaseous ions species do not dominate the arc under these conditions of short arcs and voltage 〈42 V to cause cathode erosion.
文摘动态回路电阻是一种免拆卸的触头烧蚀情况诊断方法,在不同幅值的回路电流下测得的动态回路电阻差异很大。为了研究试验电流对动态回路电阻的影响,分别测量了两套电磨损程度不同的触头系统在不同试验电流下的动态回路电阻信号,分析了动态回路电阻特征量的变化规律,研究了试验电流对动态回路电阻的影响原理。研究表明提高测量电流不仅有利于弧触头行程的确定,减小动态主回路电阻与弧触头电阻,还可以减小电阻曲线的波动,减小特征量的分散度。上述现象主要是由试验电流引起的触点温度升高造成。当试验电流范围为0.7~1 k A,试验结果比较稳定,且不会烧蚀触头。
