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The net zero mass loss phenomenon on opening switching contacts with AC loading

Record type: Article

Studies are conducted on silver metal oxide contacts on a purposed built apparatus to investigate the extent of contact erosion under opening (break) operations. The contacts are opened between 0.1 and 0.8 ms-1 at particular point-on-wave, tPOW, of the ac waveform. Current loading of up to 30 A rms, Irms is investigated. Contact material deposition, as well as mass loss, is observed and is found to balance at particular current values and point-on-wave opening leading to a net zero mass loss on the contacts. Results are presented on mass change for each contact against the two parameters of current and point-on-wave. An arc duration characteristic, ?, is plotted against current, Irms which has a net zero mass loss. The characteristic is shown to be the same for both silver tin oxide and silver cadmium oxide but is influenced by the opening velocity. The metallic and gaseous ion transfer mechanisms of the arc discharge are presented as the main processes behind this phenomenon.

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Citation

Swingler, J. and McBride, J.W. (1999) The net zero mass loss phenomenon on opening switching contacts with AC loading IEEE Transactions on Components and Packaging Technologies, 22, (1), pp. 27-37. (doi:10.1109/6144.759350).

More information

Published date: March 1999

Identifiers

Local EPrints ID: 21270
URI: http://eprints.soton.ac.uk/id/eprint/21270
ISSN: 1521-3331
PURE UUID: df10cf2b-ba39-4a53-a6d7-666a0d86a16c

Catalogue record

Date deposited: 16 Nov 2006
Last modified: 17 Jul 2017 16:26

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