Stability and a.c. loss of Nb-Ti wire for low excitation superconducting generator

✍ Scribed by K. Ohmatsu; M. Nagata; K. Takahashi

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 377 KB
• Volume: 31
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(91)90066-6

✦ Synopsis

Stability and a.c. loss were studied for three kinds of Nb-Ti wire. These wires are strands of 10 kA cables which have been developed for field windings of 70 MW class low excitation superconducting generators. All the wires consist of Nb-Ti/Cu/Cu-Ni; wires B and C are monolithic wires and wire A is a stranded cable with AI/Cu-Ni. A.c. loss was measured under field fault conditions by an electrical method and temperature rise of the windings was simulated. Stability at several points on the load line of 70 MW class field windings was evaluated quantitatively from quench energy, propagating velocity and the minimum propagating zone. It was found that the a.c. losses of the wires do not cause significant temperature rise in the windings, but the low resistivity of Cu and AI as stabilizers does affect the stability.