Donald R. Parker

HTS wire at commercial performance levels

Short rolled multifilamentary BSCCO-2223 oxide-powder-in-tube (OPIT) wire has reached a core critical current density J/sub c/ over 73,000 A/cm/sup 2/ (77 K, self-field, 1 /spl mu/V/cm) in multiple samples, with engineering (full-cross-section) current density J/sub c/ of 22,800 A/cm/sup 2/ (77 K, self-field, 1 /spl mu/V/cm). Regular production wires several hundred meters long show average engineering current density over 10,000 A/cm/sup 2/ (77 K, self-field, 1 /spl mu/V/cm), a benchmark for commercial electric power applications such as cables and motors. Cost studies indicate that cost-performance below

Long length manufacturing of high performance BSCCO-2223 tape for the Detroit Edison Power Cable Project

10/kA-m is attainable for full-scale production levels, Next-generation YBCO-123 coated conductor technology offers further potential cost-performance improvements.

Advances in the development of silver sheathed (Bi,Pb)2223 composite conductors

American Superconductor has manufactured the BSCCO-2223 tapes for the Detroit Edison Power Cable Project. Pirelli Cables and Systems, along with Detroit Edison, Lotepro, EPRI, and Los Alamos National Lab, are developing, manufacturing, and installing the worlds first HTS cable system in an electric utility network. Partially funded by the DOE-SPI program, the project goal is to fabricate, install, and test a 3-phase, 120-meter long, 100 MVA HTS cable system rated at 2400 A and 24 kV in Detroit Edisons Frisbie Station. Significant advances in HTS tape technology have been made in the past year, with average engineering critical current performance above 115 A at 77 K. We discuss the distribution of critical current as well as mechanical and environmental tests of more than 25 km of BSCCO tape manufactured for the Detroit Edison project. The environmental tests have been designed to simulate the behavior of HTS tapes under the actual operating conditions for an underground power cable.

Recent advances in long length Bi-2223 HTS multifilamentary composite wire development

Significant advances have been made in the critical current density of the technologically interesting (Bi,Pb)2223 composite conductors. Engineering current density, J/sub e/, of 9100 A/cm/sup 2/, corresponding to a filament current density, J/sub c/, of 32600 A/cm/sup 2/ (77 K, self-field) has been achieved by increasing the fraction of oxide in the conductor and improving the thermomechanical processing of the conductor. The filament microstructure may be further optimized by decreasing the volume fraction of secondary phases and porosity. The strain tolerance of the higher oxide fraction conductors remains adequate for applications by increasing the number of filaments in the conductors. Composite tapes with twisted filaments have been produced that have promising electrical properties in applied magnetic fields.<<ETX>>

Advances in the development of HTS composite conductors

Developing applications for HTS technology are now enabled by a new generation of superconducting wires that bring together the required electrical and mechanical properties in long lengths that are durable when exposed to practical application environments. Advances in the development and scale-up of long-length Bi-2223 HTS composite wire are reviewed. Powder-in-tube processing was used to produce multifilamentary tapes in continuous lengths up to 1 kilometer. Electrical performance and uniformity results are reported for the wire in 300 meter and 1 kilometer lengths. Mechanical and environmental durability performance results are reported for multifilament wire tapes being developed for react-and-wind cable application as well as for wind-and-react coil and magnet applications. The use of these wires in practical demonstration applications is also reported.<<ETX>>

Method of forming BSCCO superconducting composite articles

Abstract The performance of high-temperature superconductor (HTS) composite conductors is rapidly advancing. Filament current densities of greater than 32,000 A/cm 2 (77 K, self field, 1 μV/cm) have been achieved in multifilamentary composite conductors prepared with scaleable powder in tube techniques. This has allowed the fabrication of composite conductors with overall conductor current densities of 9100 A/cm 2 . These advances are being applied to the manufacture of composite conductors with lengths in excess of 1 km and filament currents densities of 8900 A/cm 2 (77 K, self field, 1 × 10 −11 Ω-cm). Recent advances in the development of high J c composite conductors will be reviewed. The performance and characterization of long length conductors will be described and the integration of these conductors into practical applications will be reported.