Author
F. R. Froncek
Bio: F. R. Froncek is an academic researcher from Wrocław University of Technology. The author has contributed to research in topics: Electronic circuit & Current (fluid). The author has an hindex of 1, co-authored 1 publications receiving 3 citations.
Topics: Electronic circuit, Current (fluid), Vacuum arc
Papers
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TL;DR: In this article, the results of the detailed quantitative and qualitative analysis of the current transients of the vacuum arc near ac zero are presented, and the set of theoretical dependences which enable evaluation of the influence of several switched-off circuit parameters on the current transient forms of the arc near the current zero, have been elaborated.
Abstract: The results of the detailed quantitative and qualitative analysis of the current transients of the vacuum arc near ac zero are presented. Based on the current oscillograms obtained experimentally during unstable burning of the vacuum arc, we found some characteristic transient forms have been distinguished as well as their close relation to the switched-off circuit parameters. The set of theoretical dependences which enable evaluation of the influence of several switched-off circuit parameters on the current transients of the arc near the current zero, have been elaborated, The results of theoretical analysis are in accordance with the results obtained experimentally.
3 citations
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TL;DR: In this paper, the authors present a bibliography covering the field of electrical discharges in vacuum, comprising both electrical breakdown in vacuum and vacuum arcs, and a brief section lists some review papers which would be helpful to the novice in this field.
Abstract: The author presents a bibliography covering the field of electrical discharges in vacuum, comprising both electrical breakdown in vacuum and vacuum arcs. A brief section lists some review papers which would be helpful to the novice in this field. The bulk of the presentation consists of bibliographic listings arranged by year of publication and alphabetically by author within each year. An author index refers one to all papers authored or coauthored by a particular person. >
45 citations
21 Jul 1996
TL;DR: In this article, the authors present some results obtained by the authors in the manufacture and use of equipment and adjacent measuring and diagnosis devices developed for the research of electrical switching arcs in vacuum.
Abstract: The paper presents some results obtained by the authors in the manufacture and use of equipment and adjacent measuring and diagnosis devices developed for the research of electrical switching arcs in vacuum. Tests were made for the current range 0.5-30 kA RMS and voltages between 200-1400 V. The evolution of currents and electrical switching voltages related to mechanical and vacuum breaking process parameters was recorded. Diagnosis measurements relatively to the diffuse or constricted state of the breaking electrical arc column were also performed. Research concerning the influence of the additional magnetic field upon the electrical switching arc in a vacuum have also been initiated.
13 citations
01 Sep 2012
TL;DR: In this paper, it was shown that the measured chopping currents are influenced by inductivities and capacities both in the load and in the supply circuit, and the impact of the supply voltage level was investigated to validate the measurements that were performed at lower voltages.
Abstract: Vacuum interrupters are the state of the art technology for breaking short-circuit currents and load currents in medium-voltage systems. Consequently, further applications may be established for vacuum switchgear technology. For each new application, the characteristics of vacuum interrupters have to be observed. One of these is current chopping that results in high overvoltages when switching off inductive loads. It is well known from literature that this behavior is strongly dependent on the contact material of the interrupter contacts. For example, copper-chromium has been established for the most circuit breaker applications in medium and high voltage levels. To compare the different materials and their properties, a test circuit is necessary which helps to measure the chopping current strictly according to the test circuit parameters. In this research project, it was possible to show that the measured chopping currents are influenced by inductivities and capacities both in the load and in the supply circuit. This result is of high importance for the interpretation of phenomena in practical applications. Also, the impact of the supply voltage level was investigated to validate the measurements that were performed at lower voltages.
4 citations