The model of interaction between arc and AgMeO contact materials

Author

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

Author_Institution

Xi´´an Jiaotong Univ., China

Volume

17

Issue

3

fYear

1994

fDate

9/1/1994 12:00:00 AM

Firstpage

490

Lastpage

494

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 upper and lower erosion limits, respectively, for the reason that erosion is composed of two modes: evaporation and minute molten droplets losses. Furthermore, supposing the arc column is a hypothetical point heat source in middle of the gap, a new erosion mathematical model is established by finite differential method, and the results coincide well with those of experiments

Keywords

circuit-breaking arcs; electrical contacts; high-speed optical techniques; scanning electron microscopy; silver; wear; SEM micrographs; arc-electrode interaction; arcing; cylindrical contacts; erosion losses; erosion model; evaporation; finite differential method; heat-force function; high-speed camera observations; minute molten droplets losses; phase change; point heat source; surface tension; switching experiments; viscosity; Anodes; Cameras; Cathodes; Contacts; Copper; Inorganic materials; Magnetic materials; Phase change materials; Silver; Sun;

fLanguage

English

Journal_Title

Components, Packaging, and Manufacturing Technology, Part A, IEEE Transactions on

Publisher

ieee

ISSN

1070-9886

Type

jour

DOI

10.1109/95.311761

Filename

311761