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    • 7. 发明专利
    • Critical current measuring method of the superconducting cable
    • JP5356206B2
    • 2013-12-04
    • JP2009290817
    • 2009-12-22
    • 住友電気工業株式会社東京電力株式会社
    • 正義 大屋昇一 本庄智男 三村野口  裕豊 鬼頭
    • G01N27/00
    • PROBLEM TO BE SOLVED: To provide a method for measuring the critical current of a superconductive cable capable of precisely measuring the critical current of the superconductive cable. SOLUTION: In the superconductive cable 1A wherein cable cores 10a, 10b and 10c, each of which has a superconductive conductor layer 11 and a superconductive shield layer 12, are housed in a heat-insulating pipe 13A, a DC power supply 2 is connected to one end sides of two cable cores 10a and 10b and the other end sides of the cable cores 10a and 10b are electrically connected to each other by a lead member 3 to perform the reciprocating passage of electric current to the superconductive conductor layers 11 of both cores 10a and 10b. The change speed of the DC current supplied into the superconductive conductor layers 11 is selected to adjust the value of the induced current flowing through the superconductive shield layers 12 to measure the critical current of the superconductive conductor layers 11. By reducing the magnetic field due to the conductor current flowing through the superconductive conductor layers 11 in the magnetic field due to the induced current flowing through the superconductive shield layers 12, the lowering of the critical current of the superconductive conductor layers by a leak magnetic field is suppressed to precisely measure the critical current. COPYRIGHT: (C)2011,JPO&INPIT