Spectroscopic Temperature Measurement of Breaking Arcs Near Cathode and Anode Surfaces of Copper Contacts

Naoki MORIYAMA  Junya SEKIKAWA  Takayoshi KUBONO  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.8   pp.1141-1146
Publication Date: 2006/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.8.1141
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from IS-EMD2005))
Category: Arc Discharge & Related Phenomena
breaking arc,  arc temperature,  spectral intensity,  Boltzmann plot,  

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Breaking arcs are generated between a pair of Cu electrical contacts in a DC 42 V/10.5 A circuit, and the arc voltage, the arc current and the time-resolved arc spectral intensities near contact surfaces are simultaneously measured. The arc temperature is calculated from some spectral intensities emitted from Cu neutral atoms using the Boltzmann plot method. The arc temperatures near the cathode and anode surfaces are measured, and the following experimental results were obtained. (1) Time evolutions of the spectral intensities and the calculated arc temperature have similar characteristics. (2) The arc temperature near the anode surface is higher than that near the cathode surface, and the temperature fluctuation near the anode surface is larger than that near the cathode. (3) Just before arc extinction, the arc temperature near the cathode surface is almost constant for many breaking operations but the arc temperature near the anode surface varies.