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IEICE TRANSACTIONS on Electronics

Analytical Model of Melting Phenomena for Breaking Relay Contacts

Noboru WAKATSUKI, Nobuo TAKATSU, Toshiteru MAEDA, Takayuki KUDO

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Summary :

Using the transient current switch circuit in parallel with the energizing contacts, the slow decay of the contact current due to thermal fusion of metal was observed just after the contact voltage exceeded the melting contact voltage Um. At that time, the contact voltage was higher than the boiling contact voltage Ub. These results contradict Holm's θ theory. A new melting model of breaking mechanical contact is proposed. The area surrounding a cluster of contacting a-spots melts, the melt metal diffuses, and the contact spot thermally shrinks. Including the metal phase transition from solid to liquid, the increase of contact resistance is introduced to the electric circuit analysis. The numerical analysis agrees qualitatively with measured V-I characteristics.

Publication
IEICE TRANSACTIONS on Electronics Vol.E92-C No.8 pp.1003-1007
Publication Date
2009/08/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.E92.C.1003
Type of Manuscript
Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices (IS-EMD2008))
Category
Arc Discharge & Contact Phenomena

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