A Proposal on Contact Surface Model of Electromagnetic Relays Based on the Change in Showering Arc Waveforms with the Number of Contact Operations

Kiyotomi MIYAJIMA  Shuichi NITTA  Atsuo MUTOH  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.3   pp.399-407
Publication Date: 1998/03/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromechanical Devices and their Surface Science)
Category: 
Keyword: 
showering arc,  contact,  surface roughness,  arc discharge,  molten metal bridge,  pinch effect of welding arc,  

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Summary: 
The showering arc waveforms generated when contact is being separate have poor reproducibility whose causes are not sufficiently clear. This paper describes that the contact surface conditions which change with the number of contact operations are deeply related to the showering arc waveforms. First, it is experimentally shown that the contacts' surface roughness increases with the number of contact operations, and the growth model of contact surface roughness is proposed based on the change of contact resistance for the number of contact operations. Second, the growth model of molten metal bridge is proposed based on the fact that the showering arc waveforms change with the number of contact operations and the evaluation indexes of showering arc are proposed.