Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Mario D. Cunha"'
Publikováno v:
IEEE Transactions on Plasma Science. 47:3462-3469
There are several hundreds of spots operating simultaneously on cathodes of vacuum arcs in high-power vacuum circuit breakers. In this work, the spot distribution along the contact surface is simulated by means of an approach that is based on the con
Publikováno v:
IEEE Transactions on Plasma Science. 45:2060-2069
A model of cathode spots in high-current vacuum arcs is developed, with account of the plasma cloud left over from a previously existing spot, all mechanisms of current transfer to the cathode surface, including the contribution of the plasma produce
Publikováno v:
2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
Cathode attachment of high-current vacuum arcs, e.g., those in high-power vacuum circuit breakers, represents an ensemble of several hundred of spots operating simultaneously. A natural alternative to tracing individual spots is to employ the concept
Publikováno v:
2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
A detailed model has been developed for modeling of arc plasma-cathode interaction, which takes into account a pre-existing plasma cloud, the interaction of the metal vapor plasma produced in the spot with the cathode, Joule heat generation in the ca
Publikováno v:
Journal of Physics D: Applied Physics. 52:504004
Publikováno v:
Journal of Physics D: Applied Physics
Journal of Physics D: Applied Physics, IOP Publishing, 2017, 50 (31), ⟨10.1088/1361-6463/aa76d3⟩
Journal of Physics D: Applied Physics, IOP Publishing, 2017, 50 (31), ⟨10.1088/1361-6463/aa76d3⟩
A widely used approach to simulation of high-pressure arc discharges is based on the system of magneto-hydrodynamic equations written in the approximation of local thermodynamic equilibrium (LTE). In this work, boundary conditions on the surface of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d4344542511f456af2a5559837342e8
https://hal.archives-ouvertes.fr/hal-01762324
https://hal.archives-ouvertes.fr/hal-01762324
Publikováno v:
2017 IEEE International Conference on Plasma Science (ICOPS).
A detailed numerical model of individual cathode spots in high-current vacuum arcs is developed. The model takes into account two kinds of plasmas in the vicinity of the spot: an “external” plasma (e.g., a plasma generated for arc triggering, a b
Autor:
Mikhail S. Benilov, Mario D. Cunha, Werner Hartmann, Andreas Lawall, Sylvio Kosse, Norbert Wenzel
Publikováno v:
IEEE Transactions on Plasma Science. 41:1950-1958
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 composi
Publikováno v:
2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
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 a
Publikováno v:
2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
Instability stemming from the strong dependence of electron emission current on the local surface temperature plays an important role in current transfer to hot cathodes of arc discharges. In the case of vacuum arcs, this instability may lead to micr