Determination of Cr Density in the Active Phase of a High-current Vacuum Arcs
Keywords:vacuum arc, anode spot, absorption spectroscopy
AbstractMelting and evaporation of the anode surface strongly influence the interruption capability of vacuum circuit breakers, because they lead to injection of atomic vapour into the inter-electrode gap. Determination of the vapour density and its dynamics with respect to different anode phenomena is therefore of great importance. Results of Cr density measurements in a high-current vacuum arc by using broadband absorption spectroscopy are presented. The vapour density of atomic Cr is determined after the formation of anode spots as well as close to the current zero. Cr I resonance lines at 425.43 nm have been used for the analysis. An AC current pulse with maximum value of 7 kA and a frequency of 100 Hz is applied to a vacuum arc between two cylindrical butt electrodes made of CuCr7525 with a diameter of 10 mm. The high-current anode modes are observed by means of high-speed camera imaging. The temporal evolution of the Cr ground state density is presented and discussed.
E. Schade and E. Dullni. Recovery of breakdown strength of a vacuum interrupter after extinction of high current. IEEE Trans. Dielectr. Elect. Insul., 9(2):207–215, 2002. doi:10.1109/94.993737.
E. Schade and E. Dullni. Investigation of high-current interruption of vacuum circuit breakers. IEEE Trans. Dielectr. Elect. Insul., 28(4):607–620, 1993. doi:10.1109/14.231543.
A. Khakpour, St. Franke, R. Methling, D. Uhrlandt, S. Gortschakow, S. Popov, A. Batrakov, and K.D. Weltmann. Optical and electrical investigation of transition from anode spot type 1 to anode spot type 2. IEEE Trans. Plasma Sci., 45(8):2126 – 2134, 2017. doi:10.1109/TPS.2017.2690572.
A. Khakpour, S. Popov, St. Franke, R. Kozakov, R. Methling, D. Uhrlandt, and S. Gortschakow. Determination of Cr density after current zero in a high-current vacuum arc considering anode plume. IEEE Trans. Plasma Sci., 45(8):2108 – 2114, 2017. doi:10.1109/TPS.2017.2681898.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).