Title :
The model of interaction between arc and AgMeO contact materials
Author :
Sun, Ming ; Wang, Qiping ; Lindmayer, M.
Author_Institution :
Xi´´an Jiaotong Univ., China
Abstract :
Based on switching experiments with cylindrical contacts of different diameters by high speed camera observations and SEM micrographs, the effects of phase change, viscosity and surface tension on erosion losses of AgMeO contact materials are analysed during arcing in the current range up to 1000 A rms. The erosion model of AgMeO is used for expressing the heat-force function during arc-electrode interaction and the liquid-solid, liquid-gas boundary corresponding to the upper and lower erosion limit respectively for the reason that erosion is composed of two modes: evaporation and minute molten droplets losses. Furthermore, supposing that the arc column is a hypothetical “point heat source” in middle of the gap, a new erosion mathematical model is established by the finite differential method and the results coincide well with those of experiments
Keywords :
arcs (electric); circuit-breaking arcs; electrical contacts; finite difference methods; silver; wear; 1000 A; SEM; arc-electrode interaction; arcing; cylindrical contacts; erosion losses; evaporation; finite difference model; heat-force function; high speed photography; liquid-gas boundary; liquid-solid boundary; molten droplets; phase changes; point heat source; silver/metal oxide contact materials; surface tension; switching; viscosity; Anodes; Cathodes; Contacts; Inorganic materials; Mathematical model; Phase change materials; Silver; Sun; Surface resistance; Thermal resistance;
Conference_Titel :
Electrical Contacts, 1993., Proceedings of the Thirty-Ninth IEEE Holm Conference on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
0-7803-1270-8
DOI :
10.1109/HOLM.1993.489656
