Arc Duration of Break Arcs Magnetically Blown-Out in a DC 450 V Resistive Circuit

Hitoshi ONO  Junya SEKIKAWA  Takayoshi KUBONO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.9   pp.1515-1521
Publication Date: 2012/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1515
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 2011 (IS-EMD2011) and other recent research results -)
Category: 
Keyword: 
arc discharge,  permanent magnet,  electrical contact,  transverse magnetic field,  high-speed camera,  

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Summary: 
Silver electrical contacts are separated at constant speed and break arcs are generated in a DC100 V–450 V/10 A resistive circuit. The transverse magnetic field of a permanent magnet is applied to the break arcs. Dependences of the arc duration, arc dwell time and arc lengthening time on the strength of the magnetic field and supply voltage are investigated. The characteristics of the re-ignition of the break arc are also discussed. Following results are shown. The arc duration D is increased due to the increase of the arc lengthening time tm when the supply voltage E is increased for each magnetic flux density Bx, because the arc dwell time ts is almost constant. The arc duration D is increased due to the increase of both of the arc lengthening time tm and the arc dwell time ts when the magnetic flux density Bx is decreased. The arc lengthening time tended to become long when the re-ignition of the break arc is occurred. The lengthening time tends to become longer when the duration tm1 from the start of the arc lengthening to the start of the re-ignition is increased. Re-ignitions occurred frequently when the magnetic flux density of the transverse magnetic field is increased and the supply voltage is increased.