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TitleCathode spot emergence on copper and chromium alloy used in vacuum breakers
Author(s)Lefort, A.
M'hammed, A.
Clain, Stéphane
KeywordsCathode spot
Fnite element method
Issue date2010
PublisherBegell House, Inc.
JournalHigh temperature material processes
Citation"High temperature material processes". ISSN 1093-3611. 14:3 (2010) 271-284.
Abstract(s)For copper and chromium, used in alloy component electrodes of vacuum circuit breakers, the cathode spots are initiated on micron meter spikes above the surface of the electrode, they are considered as cylinders with a height equivalent. After spraying of these peaks the cathode spot reaches the surface of the electrode on which it will expand according to a proposed model. The two studied materials have quite different thermophysical properties, but they lead to comparable results. In both cases the erosion of cylindrical spikes is due to the flow of energy provided by the cathode spot, the mechanism is different from those found for the molten bridge or for fuses where the Joule effect is the only factor to take into account.
ISSN1093-3611 Print
1940-4360 Online
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:CMAT - Artigos em revistas com arbitragem / Papers in peer review journals

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