Occurrence of Reignitions of Break Arcs When Moving Range of Arc Spots are Restricted within the Contact Surfaces

Junya SEKIKAWA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E99-C    No.9    pp.992-998
Publication Date: 2016/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.992
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices)
Category: 
Keyword: 
arc discharge,  electric contacts,  high speed camera,  

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Summary: 
Silver contacts are separated at constant speed and break arcs are generated in a 300V-450V DC and 10A resistive circuit. The transverse magnetic field of a permanent magnet is applied to the break arcs. Motion of the break arcs, arc duration and the number of reignitions are investigated when side surfaces of the contacts are covered with insulator pipes. Following results are shown. The motion of the break arcs and the arc duration when the anode is covered with the pipe are the same as those without pipes. When the cathode is covered with the pipe, the motion of break arcs change from that without the pipes and reignitions occur more frequently. The arc duration becomes longer than that without the pipes because of the occurrence of reignitions. The number of reignition increases with increasing the supply voltage in 300V-400V. The period of occurrence of the reignition with pipes is shorter than that when the cathode is covered with the pipe.