Effects of frequencies and temperatures on self-field loss for Ag/Bi-2223 tapes

Self-field loss of Ag/Bi-2223 tape conductors cooled by using the GM cryoco oler in the temperature range of 60-100 K was studied in the conditions of various frequencies (10-500 Hz) of AC transport current. Self-field loss pe r cycle and per length divided by a square of critical current, I-c(2), dec reased with increase of the frequency and with decrease of temperature unli ke Norris' equation. Especially, the loss reduction ratio by frequency chan ge decreased with increase in temperature. To confirm difference in loss de pendencies between the calculated and the experimental results, we also ach ieved the numerical analysis based on Maxwell's equations using a finite di fference method. The analysis results were mostly in agreement with the exp erimental results. (C) 2001 Elsevier Science B.V. All rights reserved.