Effect of Magnetic Blow-Out and Air Flow on Break Arcs Occurring between Silver Electrical Contacts with Copper Runners

Haruki MIYAGAWA  Junya SEKIKAWA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.9   pp.709-715
Publication Date: 2017/09/01
Online ISSN: 1745-1353
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices)
Category: 
Keyword: 
electrical contacts,  electromagnetic relay,  high-speed camera,  arc spots,  

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Summary: 
Arc runners are fixed on silver electrical contacts. Break arcs are generated between the contacts in a 450VDC circuit. Break arcs are magnetically blown-out and air is blown to the break arcs. The air flow was not used to our previous reports with runners. Circuit current when contacts are closed is 10A. Flow rate of air Q is changed from 1 to 10L/min. Supply voltage E is changed from 200V to 450V. The following results are shown. Arc duration D tends to decrease with increasing flow rate Q. The number of reignitions N increases with increasing supply voltage E for each flow rate Q. The number of reignitions is the least when the flow rate Q is 2L/min.