NDLI: Scaling of high current GIS contact thermal stability

Content Provider	IEEE Xplore Digital Library
Author	Boggs, S. Nishiwaki, S. Toyoda, M. Kuang, J.
Copyright Year	2002
Description	Author affiliation: Dept. of Electr. Eng., Toronto Univ., Ont., Canada (Boggs, S.)
Abstract	When two pieces of metal are pushed together with moderate force as in a sliding high current contact, they typically touch at 10 to 50 spots which must carry all the current passing through the contact. The total contact area is determined by the force and hardness of the contact material; however, the number of contact spots and average area of each can vary with the nature of the contact surfaces. Through the use of transient nonlinear finite element analysis, we have solved for the temperature as a function of time in the contact spot to determine the conditions under which a spot is thermally stable. Based on this investigation, we have developed physically based scaling rules for thermal time constants and the maximum current for which the spot will be thermally stable. These scaling rules imply that the total current for stable contact operation goes as the square root of the number of contact spots, recognizing that the total contact area is fixed.
Starting Page	99
Ending Page	103
File Size	501664
Page Count	5
File Format	PDF
ISBN	0780375254
DOI	10.1109/TDC.2002.1178267
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-06
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectrics and electrical insulation Geographic Information Systems Temperature Contacts Thermal conductivity Coatings Finite element methods Conducting materials Thermal stability Material properties
Content Type	Text
Resource Type	Article

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