A Staged Spectral Acquisition Method for Intermediate-Frequency Vacuum Arcs Under Ruled Curved Contacts

The parameters of microscopic particles during the arcing process of a vacuum arc are among the crucial parameters reflecting the arc state. Specifically, the parameters of the microscopic components of the vacuum arc serve as important indicators for evaluating the degree of ionization of the gap metal vapor. At present, the research methods for the components of vacuum arcs mainly fall into two categories: measuring the charge to mass ratio of ions and conducting spectral diagnosis of the arc. As a non-contact measurement approach, spectral diagnosis can make use of the fact that each particle component corresponds to a characteristic wavelength spectrum to obtain the percentage distribution of the microscopic components of particles. Since the interruption time of a vacuum arc is usually on the millisecond scale, especially for intermediate-frequency vacuum arcs, the half - wave arcing time is only 1.3 ms. However, ordinary spectral analysis systems can only analyze the spectra of power - frequency arcs and lack the analysis of spectral changes within the arcing cycle. Therefore, this paper proposes a staged arc spectrum acquisition system. Moreover, it analyzes the spectra of intermediate-frequency vacuum arcs under ruled curved contacts and obtains the spectral variation trend of a 360 Hz, 7 kA vacuum arc.