Contact Resistance Distribution on Anode Surfaces Eroded by Break Arcs in a DC48V Resistive Circuit

Junya SEKIKAWA  Katsuyoshi MIYAJI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.9   pp.1142-1147
Publication Date: 2013/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.1142
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices — Papers selected from International Session on Electro-Mechanical Devices 2012 (IS-EMD2012) and other recent research results —)
Category: 
Keyword: 
relay,  electrical contacts,  contact erosion,  metallic arc,  

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Summary: 
Break arcs are generated in a DC48V resistive circuit. The circuit current is varied from 1A to 6A. The contact resistance distribution on the anode surfaces eroded by break arcs is investigated. The following results are shown. When the current is 2A, 3A and 6A, the contact resistance at the center region of the anode surface is higher than that around the center region. The contact resistance around the center region decreases with the decrease of the circuit current. When the current is 1A, the contact resistance is very low at all positions on the contact surface. The lower contact resistance may be caused by the occurrence of the short arc that is extinguished in the metallic phase arc.