Superconducting Feeder Cable Laying and Stress Relaxation Method for Cooling

Superconducting feeder cables shrink because of thermal stress during the cooling process. When a long superconducting feeder cable is laid along a railway line, measures must be taken to prevent cable shrinkage. This paper therefore introduces a method which was used to lay a 300-m class superconducting feeder cable along a test track. This paper also reports that the method is suitable for similar cables, because no buckling or rupture points were observed after X-ray radiographs were taken over the whole length of the cable after its installation, and that transmission tests were conducted successfully with the cable.