The net zero mass loss phenomenon on opening switching contacts with AC loading
The net zero mass loss phenomenon on opening switching contacts with AC loading
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.
27-37
Swingler, J.
c6e2a49e-fadd-4f38-99f7-0ee1e2c92fac
McBride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770
March 1999
Swingler, J.
c6e2a49e-fadd-4f38-99f7-0ee1e2c92fac
McBride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770
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), .
(doi:10.1109/6144.759350).
Abstract
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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Published date: March 1999
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Local EPrints ID: 21270
URI: http://eprints.soton.ac.uk/id/eprint/21270
ISSN: 1521-3331
PURE UUID: df10cf2b-ba39-4a53-a6d7-666a0d86a16c
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Date deposited: 16 Nov 2006
Last modified: 16 Mar 2024 02:37
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J. Swingler
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