Voltage steps in atmospheric low current arcs between opening silver metal oxide contacts


Abu-Sharkh, S.M. and McBride, J.W. (2002) Voltage steps in atmospheric low current arcs between opening silver metal oxide contacts. In, Proceedings of the Forty-Third IEEE Holm Conference on Electrical Contacts, 1997. Forty-Third IEEE Holm Conference on Electrical Contacts, 1997 USA, Institute of Electrical and Electronics Engineers, 233-237. (doi:10.1109/HOLM.1997.638047).

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Original Publication URL: http://dx.doi.org/10.1109/HOLM.1997.638047

Description/Abstract

When breaking a low current dc circuit (typically <10 A), the arc voltage exhibits a stepped rise as the contacts move apart. As the current increases, these steps gradually disappear, and the voltage rises smoothly. The paper presents experimental results for atmospheric arcs between silver metal oxide contacts. Up to 5 steps can be observed for currents less than 0.5 A. The probability of occurrence of the steps decreases as their voltage level increases. The number of steps also decreases with increasing current. At currents above 7 A the steps disappear and the voltage rises smoothly. The contact gaps at which the steps occur were found to increase as contact opening velocity increases. The paper discusses the different theories proposed in the literature to explain the phenomena, in the light of the presented experimental results.

Item Type: Book Section
ISBNs: 0780339681 (hardback)
Related URLs:
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 21254
Date Deposited: 16 Nov 2006
Last Modified: 27 Mar 2014 18:10
URI: http://eprints.soton.ac.uk/id/eprint/21254

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