Restriction on Motion of Break Arcs Magnetically Blown-Out by Surrounding Walls in a 450VDC/10A Resistive Circuit

Keisuke KATO  Junya SEKIKAWA  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.9   pp.1009-1015
Publication Date: 2016/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.1009
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices)
electromagnetic relay,  permanent magnet,  high speed camera,  arc extinction,  

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Silver electrical contacts are separated at constant speed and break arcs are generated between them in a 200V-450VDC and 10A resistive circuit. The motion of the break arcs is restricted by some surrounding alumina plates. Transverse magnetic field of a permanent magnet is applied to the break arcs. Changing the supply voltage and the height of a wall located at the upper side of the break arcs, the arc lengthening time and motion of the break arcs are investigated. As a result, the higher supply voltage causes an increase of the arc lengthening time. The arc lengthening time increases significantly when the break arcs expand into the whole of the surrounding walls.