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Journal of Electronic Materials

, Volume 42, Issue 7, pp 2337–2342 | Cite as

Development of a Peltier Current Lead for the 200-m-Class Superconducting Direct Current Transmission and Distribution System

  • Toshio Kawahara
  • Masahiko Emoto
  • Hirofumi Watanabe
  • Makoto Hamabe
  • Sataro Yamaguchi
  • Yasuo Hikichi
  • Masahiro Minowa
Article
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Abstract

Reducing cryogenic heat leaks is critical for superconducting applications. Reduction of heat leak at the terminals is essential for uses with short-length applications, where cryogenic losses at the terminals dominate. We are developing a 200-m-class superconducting direct current (DC) transmission and distribution system (CASER-2), and have used a Peltier current lead (PCL) for heat insulation at the terminals. The PCL consists of thermoelectric elements and copper leads, which enhance the performance of superconducting systems. As DC flows through the current lead, thermoelectric elements on opposite terminations of a superconducting line can be used to decrease the heat ingress to the cryogenic environment (n-type on one end, p-type on the opposite end). During the current feeding and cooling test, a large temperature difference was observed across thermoelectric elements in the PCL. This demonstrates that we have successfully insulated the heat leak at the current lead. During the fourth cooling test, we established a new PCL design with p-type elements at terminal B, and then compared the performance of the terminals. Several improvements were implemented, including balancing the resistances of the PCL to enhance the stability of the superconducting systems.

Keywords

Peltier current lead (PCL) superconducting applications DC transmission and distribution system BiTe alloy 
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Copyright information

© TMS 2013

Authors and Affiliations

  • Toshio Kawahara
    • 1
  • Masahiko Emoto
    • 2
  • Hirofumi Watanabe
    • 1
  • Makoto Hamabe
    • 1
  • Sataro Yamaguchi
    • 1
  • Yasuo Hikichi
    • 3
  • Masahiro Minowa
    • 3
  1. 1.Center of Applied Superconductivity and Sustainable Energy ResearchChubu UniversityKasugaiJapan
  2. 2.Department of Large Helical Device ProjectNational Institute for Fusion ScienceTokiJapan
  3. 3.SWCC Showa Cable Systems Co. Ltd.SagamiharaJapan

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