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Article Dans Une Revue Plasma Science and Technology Année : 2014

Formation of a 40 A DC Current Arc During the Opening of Silver Contacts

Résumé

The erosion of silver contacts due to break arcs with length proportional to time and of variable duration, has been measured by weighing the contacts following 5000 openings at a constant current equal to 40 A. The experimental results show that, for arc durations less than 60 µs, the transfer of metal from the anode to the cathode occurs, but after passing this stage, when the two electrodes are separated by greater distances, each will display erosion. This is the result of the diffusion of material outside the space between the two electrodes. In order to interpret these results, we have applied a classical model of the physical phenomena occurring at the base of the arcs. Analysis of the experimental results shows that for an arc duration of less that 15 µs, no distinct cathode base is seen to exist, but beyond this, the cathode displays several spots for a time up to 50 µs, after which they merge into a single spot. Comparison between experiment and theoretical interpretation is reasonable up to 60 µs.
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Dates et versions

hal-01025703 , version 1 (18-07-2014)

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M'Hammed Abbaoui, André Lefort, Erwann Carvou, Damien Sallais, James Brian Alexander Mitchell, et al.. Formation of a 40 A DC Current Arc During the Opening of Silver Contacts. Plasma Science and Technology, 2014, 16 (5), pp.471-478. ⟨10.1088/1009-0630/16/5/06⟩. ⟨hal-01025703⟩
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