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Publication
Phenomenological approach to simulation of propagation of spots over cathodes of high-power vacuum circuit breakers
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Advisor(s)
Abstract(s)
A phenomenological description of an ensemble
of a large number of spots on negative contacts of
high-power vacuum circuit breakers is developed by
means of generalization of the concept of random walk of a
single cathode spot in low-current vacuum arcs. The model
is formulated in terms of a convection-diffusion equation
governing the evolution of the number of spots per unit
area, taking into account the variation of the number of
spots with the arc current and the “retrograde repulsion”
between spots. The approach is applied to description of
the distribution of cathode spots during the initial
expansion process after arc ignition in conditions of two
independent experiments simulating high-power switches.
A reasonably good agreement between the theory and the
experiment is found. The developed model can be used as a
module of global numerical models of the interruption
process in high-power vacuum circuit breakers.
Description
Keywords
Cathodes of high-power Vacuum circuit breakers Simulation of propagation of spots . Faculdade de Ciências Exatas e da Engenharia
Citation
Cunha, M. D., Wenzel, N., Benilov, M. S., & Hartmann, W. (2016, September). Phenomenological approach to simulation of propagation of spots over cathodes of high-power vacuum circuit breakers. In 2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) (Vol. 1, pp. 1-4). IEEE. DOI: 10.1109/DEIV.2016.7748728
Publisher
IEEE