Title :
Post bridge phenomena in electrical contacts at the initial stage
Author_Institution :
Inst. of Theor. & Appl. Math., Acad. of Sci., Alma Ata, Kazakhstan
Abstract :
Consecutive stages of contact opening are described by the mathematical model. It includes phenomena in separating contacts before melting point, appearance, evolution and rupture of liquid metal bridge, the arc ignition and spreading in bridge metallic vapours until transformation of the metallic arc phase into a gaseous one. The calculation of lifetime and energy of each stage, contact voltage, temperature and other parameters are compared with experimental data obtained by T. Takagi and R. Haug. It is shown that arc duration depends on opening velocity, contact scale roughness, energy and length of liquid bridge.
Keywords :
arcs (electric); circuit-breaking arcs; electrical contacts; melting point; modelling; temperature distribution; thermal analysis; arc duration; arc ignition; bridge metallic vapour; contact opening; contact scale roughness; contact voltage; electrical contacts; initial stage; liquid bridge length; liquid metal bridge; mathematical model; opening velocity; post bridge phenomena; Bridge circuits; Contact resistance; Electric resistance; Electrodes; Heating; Ignition; Mathematical model; Solids; Temperature; Voltage;
Conference_Titel :
Electrical Contacts, 1995., Proceedings of the Forty-First IEEE Holm Conference on
Conference_Location :
Montreal, Quebec, Canada
Print_ISBN :
0-7803-2728-4
DOI :
10.1109/HOLM.1995.482872
