Contact resistance characteristics of high temperature superconducting bulk

Tomokazu Sakai, Naoki Yamamoto, Koichiro Sawa, Masaru Tomita, Masato Murakami

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)


A Persistent Current Switch (PCS) is a key component for Superconducting Magnetic Energy Storage (SMES) system because it is used to change a superconducting coil from storage mode to transfer mode. In the previous paper, YBa2Cu3O6+δ (YBCO) bulk of High-temperature superconductor (HTS) was proposed as a switch material, and the test on the fundamental characteristics of a mechanical contact between two YBCO bulks was carried out. As a result, a switching phenomenon between low and high resistance ranges is observed at a threshold current value in V-I characteristics of the YBCO contact. The threshold current is called a transfer current. In this paper, the relation between surface treatment and transfer current is investigated and the transfer current is found to be larger in finely finished surface. And instability of contact voltage is observed in the low resistance range. Further, a numerical analysis of the current and temperature distributions is tried to clarify the transition between high and low contact resistance ranges.

Original languageEnglish
Pages (from-to)206-211
Number of pages6
JournalElectrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts
Publication statusPublished - 2002 Jan 1
Externally publishedYes
Event48th IEEE Holm COnference on Elctronical Contacts - Orlando, FL, United States
Duration: 2002 Oct 212002 Oct 23


  • Contact resistance
  • High-temperature superconductor
  • Transfer current
  • YBCO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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