Title :
Electric field and losses in BSCCO-2223/Ag tapes carrying AC transport current
Author :
Paasi, J. ; Polak, M. ; Kottman, P. ; Suchon, D. ; Lahtinen, M. ; Kokavec, J.
Author_Institution :
Lab. of Electr. & Magnetism, Tampere Univ. of Technol., Finland
fDate :
6/1/1995 12:00:00 AM
Abstract :
Electric field and losses in single layer coils wound of 0.75 m long multifilamentary BSCCO-2223/Ag tapes carrying AC transport current have been studied at both 4.2 K and 77 K in the frequency range from 0.01 Hz up to 100 Hz, with the main effort at 50 Hz. Current amplitudes (I/sub p/) ranged from i=I/sub p//I/sub c/=0.5 to 1.3, critical current (I/sub c/) determined by the standard 1 /spl mu/V/cm static electric field criterion. I/sub c/ of coil 1 was 15 A at 4.2 K and 3 A at 77 K. Losses due to the wide resistive transition of the coils were found to dominate over self-field losses even well below i=1. Therefore the total losses in the whole applicable i range could not be described well by equations based on the critical state model.<>
Keywords :
bismuth compounds; calcium compounds; copper compounds; critical currents; electric fields; loss measurement; losses; multifilamentary superconductors; power cable testing; strontium compounds; superconducting cables; superconducting coils; superconducting magnets; 0.01 to 100 Hz; 0.5 to 1.3 A; 0.75 m; 15 A; 3 A; 4.2 K; 50 Hz; 77 K; AC losses; AC transport current; Ag; BiSrCaCuO; critical current; current amplitude; electric field; measurements; multifilamentary tapes; self-field losses; single layer coils; superconducting cable; Electric fields; Fault current limiters; Magnetic materials; Multifilamentary superconductors; Niobium compounds; Superconducting coils; Superconducting magnets; Superconducting materials; Transformers; Wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
