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IEICE Transactions on Electronics 2007 E90-C(7):1429-1434; doi:10.1093/ietele/e90-c.7.1429
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Copyright © 2007 The Institute of Electronics, Information and Communication Engineers

Special Section on Recent Development of Electromechanical Devices (Selected Papers from ICEC2006) -- Papers -- Materials

Numerical Analyses of Electrical Contact Characteristics of YBCO Bulk

Mingzhe RONG1, Jian LI1, Yi WU1 and Zhiqiang SUN1

1 The authors are with the State Key Lab of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, China. E-mail: mzrong{at}mail.xjtu.edu.cn


  Abstract

There are two interesting phenomena for the electrical contact characteristics of YBCO bulk. One is the transition between low and high contact resistance states at a threshold current value which is called a transfer current; the other is the forming reason of the residual resistance when the carrying current is lower than the transfer current. In this paper, an axial symmetric model is constructed to investigate these two phenomena. During the calculation, the thermal field, the electrical field and the self magnetic field are coupled with each other. The detailed fields' distributions are obtained. The calculation results are accordance with the experimental results. And some useful conclusions are drawn based on the numerical analyses.

Key Words: YBCO, persistent current switch, contact resistance, transfer current

Manuscript received November 17, 2006. Manuscript revised January 19, 2007.


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