Arc Length of Break Arcs Magnetically Blown-Out at Arc Extinction in a DC450V/10A Resistive Circuit

Hitoshi ONO  Junya SEKIKAWA  

IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.9   pp.1132-1137
Publication Date: 2013/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.1132
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 —)
arc discharge,  permanent magnet,  external magnetic field,  electrical contact,  

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Silver electrical contacts are separated at a constant speed and break arcs are generated in a DC300V-450V/10A resistive circuit. The transverse magnetic field formed by a permanent magnet is applied to the break arcs. Alumina pipes are placed around the contacts to restrict the motion of break arcs. The dependences of the arc lengthening time and arc length just before arc extinction L on the strength of the magnetic field and supply voltage are investigated. It was found that the arc lengthening time increases with increasing supply voltage E and tends to decrease when the magnetic flux density Bx is increased. The arc length just before arc extinction L increases with increasing E and decreasing Bx. It also increases linearly with increasing arc lengthening time tm when no reignitions occur.