Real Time Spectroscopic Observation of Contact Surfaces Being Eroded by Break Arcs


IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.6   pp.592-598
Publication Date: 2014/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.592
Type of Manuscript: PAPER
Category: Electromechanical Devices and Components
break arc,  contact erosion,  electrical contacts,  high-speed camera,  48V,  

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Break arcs are generated in a DC48V and 12A resistive circuit. Silver electrical contacts are separated at constant opening speed. The cathode contact surface is irradiated by a blue LED. The center wavelength of the emission of the LED is 470nm. There is no spectral line of the light emitted from the break arcs. Only the images of contact surface are observed by a high-speed camera and an optical band pass filter. Another high-speed camera observes only the images of the break arc. Time evolutions of the cathode surface morphology being eroded by the break arcs and the motion of the break arcs are observed with these cameras, simultaneously. The images of the cathode surface are investigated by the image analysis technique. The results show that the moments when the expanded regions on the cathode surface are formed during the occurrence of the break arcs. In addition, it is shown that the expanded regions are not contacted directly to the cathode roots of the break arcs.