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Stability of stationary solutions in the theory of cathode spots in arcs in vacuum and ambient gas
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Advisor(s)
Abstract(s)
Stability of stationary spots on cathodes of arcs
in vacuum and ambient gas has been investigated by
means of simulation of development in time of
perturbations imposed over steady-state solutions. Two
cases of loading conditions have been considered, namely,
spots operating at fixed current (the case typical of
small-scale experiments) and spots operating at fixed
voltage (the case typical of high-power circuit breakers).
Results are reported on spots on large copper cathodes of
vacuum arcs and on spots on tungsten cathodes of
high-pressure argon arcs. It is shown, in particular, that if
the ballast resistance in a small-scale laboratory
experiment with a high-current arc is insufficient,
potential consequence may be a thermal explosion of a spot,
if the arc burns in vacuum, and massive melting of the
cathode surface, if the arc burns in ambient gas. This
conclusion conforms to trends observed in the experiment.
Description
Keywords
Cathode spots Arcs in vacuum Ambient gas . Faculdade de Ciências Exatas e da Engenharia
Citation
Benilov, M. S., Cunha, M. D., Hartmann, W., & Wenzel, N. (2014). Stability of stationary solutions in the theory of cathode spots in arcs in vacuum and ambient gas. In 2014 International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) (pp. 197-200). IEEE. DOI: 10.1109/DEIV.2014.6961653
Publisher
IEEE