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Publication
Space-resolved modeling of stationary spots on copper vacuum arc cathodes and on composite CuCr cathodes with large grains
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Advisor(s)
Abstract(s)
A self-consistent space-resolved numerical model of
cathode spots in vacuum arcs is realized on the computational
platform COMSOL Multiphysics. The model is applied to the
investigation of stationary spots on planar cathodes made of
copper or composite CuCr material with large ( 20 µm)
chromium grains. The modeling results reveal a well defined spot
with a structure, which is in agreement with the general theory
of stationary cathode arc spots and similar to that of spots on
cathodes of arcs in ambient gas. In the case of CuCr contacts
with large chromium grains, spots with currents of the order of
tens of amperes on copper coexist with spots on chromium with
currents of the order of one or few amperes. The main effect of
change of the cathode material from copper to chromium is a
reduction of thermal conductivity of the cathode material, which
causes a reduction of the radius of the spot and a corresponding
reduction of the spot current.
Description
Keywords
Cathode spots Circuit breakers Composite cathodes Vacuum arcs . Faculdade de Ciências Exatas e da Engenharia
Citation
Benilov, M. S., Cunha, M. D., Hartmann, W., Kosse, S., Lawall, A., & Wenzel, N. (2013). Space-resolved modeling of stationary spots on copper vacuum arc cathodes and on composite CuCr cathodes with large grains. IEEE Transactions on Plasma Science, 41(8), 1950-1958. DOI: 10.1109/TPS.2013.2263255
Publisher
Institute of Electrical and Electronics Engineers