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Paper Abstract and Keywords
Presentation 2011-10-21 13:00
An experimental study on evaluation of changes in contact surface profiles with an optical cross-section method during breaking operations of a DC inductive load current
Keisuke Takahashi, Makoto Hasegawa (Chitose Inst. of Sci. & Tech.) EMD2011-58
Abstract (in Japanese) (See Japanese page) 
(in English) Contact surfaces of mechanical relays and switches are often damaged by arc discharges and/or mechanical wear during switching operations. Conventionally, erosion and transfer characteristics of various contact materials under different load conditions have been mainly studied based on observation and evaluation of contact surfaces after switching operation tests. On the other hand, a further detailed study will become possible if we can observe and numerically evaluate a changing process of surface damages (especially, growth of a crater and/or a pip) on contact surfaces during switching operations. For that purpose, an evaluation system of contact surface damages by way of an optical cross-section method is being constructed. In this paper, Ag and AgSnO2 contacts were operated to break a DC inductive 14V-2A load current for 50,000 operations. During the switching operations, changes in a surface profile of the movable (cathode) electrode (a crater growth process) were observed with the optical cross-section method at every 2000 operations. In addition, a surface of the counterpart fixed (anode) electrode (a pip growth process) was also observed with an additional camera system. Some differences were observed with different contact materials.
Keyword (in Japanese) (See Japanese page) 
(in English) optical cross-section method / electrical contacts / arc discharge / crater shape / material transfer / erosion / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 254, EMD2011-58, pp. 7-12, Oct. 2011.
Paper # EMD2011-58 
Date of Issue 2011-10-14 (EMD) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EMD  
Conference Date 2011-10-21 - 2011-10-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Tachikawa-Shiminn-kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMD 
Conference Code 2011-10-EMD 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An experimental study on evaluation of changes in contact surface profiles with an optical cross-section method during breaking operations of a DC inductive load current 
Sub Title (in English)  
Keyword(1) optical cross-section method  
Keyword(2) electrical contacts  
Keyword(3) arc discharge  
Keyword(4) crater shape  
Keyword(5) material transfer  
Keyword(6) erosion  
Keyword(7)  
Keyword(8)  
1st Author's Name Keisuke Takahashi  
1st Author's Affiliation Chitose Institute of Science and Technology (Chitose Inst. of Sci. & Tech.)
2nd Author's Name Makoto Hasegawa  
2nd Author's Affiliation Chitose Institute of Science and Technology (Chitose Inst. of Sci. & Tech.)
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Speaker Author-1 
Date Time 2011-10-21 13:00:00 
Presentation Time 25 minutes 
Registration for EMD 
Paper # EMD2011-58 
Volume (vol) vol.111 
Number (no) no.254 
Page pp.7-12 
#Pages 6 
Date of Issue 2011-10-14 (EMD) 

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