Title :
High currents in MCP BSCCO 2212 bulk material
Author :
Elschner, Steffen ; Bock, Joachim ; Brommer, Günther ; Herrmann, P.F.
Author_Institution :
Hoechst AG, Frankfurt am Main, Germany
fDate :
7/1/1996 12:00:00 AM
Abstract :
[BAs an extension of the Melt Cast Process (MCP) the centrifugal casting technique is a flexible method for manufacturing Bi2Sr2CaCu2Ox bulk parts. It provides large scale rings and tubes, needed for high current electrotechnical applications as current leads and inductive fault current limiters. Low resistance contacts are integrated right in the fabrication process. Intrinsic (self field free) current densities up to 4 kA/cm2 (T=77 K) could be determined on small samples. Tubes with a diameter up to 70 mm and a length of 200 mm were investigated with respect to their DC and AC current carrying capability (I=7500 A, DC, 4 μV/cm and Ieff=8300 A, AC, T=77 K). This current essentially is limited by self field effects as is shown in a numerical simulation. The quenching behaviour is related to the shape and temperature dependence of the U(I)-characteristics. First applications, i.e. hybrid current leads with integrated MCP bulk parts, are presented
Keywords :
bismuth compounds; calcium compounds; casting; current limiters; electrical conductivity; high-temperature superconductors; quenching (thermal); strontium compounds; 200 mm; 70 mm; 7500 A; 77 K; 8300 A; Bi2Sr2CaCu2O; Bi2Sr2CaCu2Ox; U(I)-characteristics; centrifugal casting technique; high current electrotechnical applications; hybrid current leads; inductive fault current limiters; large scale rings; large scale tubes; low resistance contacts; melt cast process; quenching; self field free current density; shape dependence; temperature dependence; Bismuth compounds; Casting; Contact resistance; Current density; Fabrication; Fault current limiters; Flexible manufacturing systems; Large-scale systems; Manufacturing processes; Strontium;
Journal_Title :
Magnetics, IEEE Transactions on
