NDLI: Mathematical model of the short arc phenomena at the initial stage

Content Provider	IEEE Xplore Digital Library
Author	Kharin, S.N.
Copyright Year	1997
Description	Author affiliation: Inst. of Math., Kazakhstan Acad. of Sci., Almaty, Kazakhstan (Kharin, S.N.)
Abstract	A mathematical model is presented describing transient phenomena accompanied by a vacuum short arc at the initial stage of contact opening. It enables one to describe the evolution of transient short anode dominated arc, which appears just after the rupture of molten bridge, into diffusive cathode dominated arc. The model of an vacuum arc includes equations for the cathode region (sheath, ionization zone, cathode surface and bulk), arc column and anode region. The heat flux components entering and leaving electrode surfaces owing to ion bombardment, electron emission, inverse electron flux and radiation from the arc, melting, evaporation and heat conduction are taken into account. The peculiarity of this model is the radial dependence of unknowns values and anode spot extension with due regard to both arc column expansion and increasing of conic arc base during contact opening. The model enables one to find the temperature and electrical fields, heat flux components, electron, ion, and inverse back-diffusion components of current density in dependence on current, opening velocity, contact gap, and properties of contact materials. It was found also that the duration of transient anode dominated arc depends on the parameters of liquid bridge. Transition of transient anode arc into diffusive cathode arc is formulated. The results of the calculations for the copper and molybdenum contacts are given for the current range from 100 A to 500 A and opening velocities from 0.5 m/sec to 20 m/sec.
Starting Page	289
Ending Page	305
File Size	1140774
Page Count	17
File Format	PDF
ISBN	0780339681
DOI	10.1109/HOLM.1997.638055
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Mathematical model Anodes Cathodes Contacts Vacuum arcs Bridges Electron emission Equations Ionization Electrodes
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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