Experimental Study on Arc Motion and Voltage Fluctuation at Slowly Separating Contact with External DC Magnetic Field

Yoshiki KAYANO  Kazuaki MIYANAGA  Hiroshi INOUE  

IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.9   pp.858-862
Publication Date: 2014/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.858
Type of Manuscript: BRIEF PAPER
Voltage fluctuation,  arc motion,  external DC magnetic field,  slowly separating,  silver-tin dioxide contact,  

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Since electromagnetic (EM) noise resulting from an arc discharge disturbs other electric devices, parameters on electromagnetic compatibility, as well as lifetime and reliability, are important properties for electrical contacts. To clarify the characteristics and the mechanism of the generation of the EM noise, the arc column and voltage fluctuations generated by slowly breaking contacts with external direct current (DC) magnetic field, up to 20 mT, was investigated experimentally using Ag90.7wt%SnO2 9.3wt% material. Firstly the motion of the arc column is measured by high-speed camera. Secondary, the distribution of the motion of the arc and contact voltage are discussed. It was revealed that the contact voltage fluctuation in the arc duration is related to the arc column motion.