Transient stability of superconducting cables against thermal disturbance

✍ Scribed by T. Onishi; K. Koyama; K. Komuro; H. Ugazin

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 621 KB
• Volume: 21
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(81)90178-8

✦ Synopsis

The stability of a superconducting cable is investigated by measuring the heat flux cooled by liquid helium. It was found that the heater power needed to make the cable go to the normal state can be given by PH = Ps + Eo (A mrn/T, where, Ps is the steady heater power needed to make the cable go normal, Eo(A Tm) , certain energy determined by the temperature increase of the superconducting cable as well as cooling conditions, and T, the heating period. Therefore the permisable thermal disturbance becomes very large as the duration becomes shorter. The reason seems to be that a lot of heater energy is removed by the latent heat of liquid helium which exists just around the strands. Estimating the amount of liquid helium evaporated by the heater energy, superconducting cables seem to be stable against such thermal disturbance if liquid helium exists in contact with the cables by the amount of about 10 ~ 30% of the cable volume.