Original title: Investigation of diffuse current in arc boundary by electric probes
Translated title: Studium difuzního proudu na hranici oblouku pomocí elektrických sond
Authors: Chumak, Oleksiy ; Hrabovský, Milan ; Kavka, Tetyana ; Kopecký, Vladimír
Document type: Papers
Conference/Event: Symposium on Physics of Switching Arc/16th./, Brno (CZ), 2005-09-05 / 2005-09-09
Year: 2005
Language: eng
Abstract: [eng] [cze]
Electric probes were used for investigation of an intermediate layer between the arc and anode surface in regions outside the main current channel. Distributions of a diffuse current and the potential were measured. Resistance and heating of the intermediate layer by diffuse current were evaluated.It was found that not only the value of diffuse current strongly depends on distance from the arc but also the shape of the distribution and the position of the maximum of the current change with the distance. These trends can be explained by expanding of the plasma jet. Evaluated equivalent intermediate layer resistance shows widening of the conductive region in a stream wise direction. Variation of resistivity of the intermediate layer is much higher than variation of the potential drop on the layer. That means that distributed current as well as Joule heating of the layer are generally controlled by distributed resistance. Bylo měřeno rozdělení difuzního proudu a potenciálu v přechodové oblasti mezi elektrickým obloukem a povrchem anody. Na vzdálenosti anody závisí nejen proud, ale i tvar rozdělení a poloha maxima. Vodivá oblast se rozšiřuje ve směru proudu, změny vodivosti jsou větší než spád potenciálu na vrstvě.
Keywords: anode attachment; arc boundary; arc root
Project no.: CEZ:AV0Z20430508 (CEP)
Host item entry: Proceedings XVIth Symposium on Physics of Switching Arc, ISBN 80-214-2931-3

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0111098

Permalink: http://www.nusl.cz/ntk/nusl-31918


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Research > Institutes ASCR > Institute of Plasma Physics
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