The model of interaction between arc and AgMeO contact materials

Author

Sun, Ming ; Wang, Qiping ; Lindmayer, M.

Author_Institution

Xi´´an Jiaotong Univ., China

fYear

1993

fDate

27-29 Sep 1993

Firstpage

27

Lastpage

32

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Contacts, 1993., Proceedings of the Thirty-Ninth IEEE Holm Conference on

Conference_Location

Pittsburgh, PA

Print_ISBN

0-7803-1270-8

Type

conf

DOI

10.1109/HOLM.1993.489656

Filename

489656