Low ac loss geometries in YBCO coated conductors and impact on conductor stability

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physica C

DOI:https://doi.org/10.1016/j.physc.2007.03.499· OSTI ID:931705

Duckworth, Robert C ^[1]; List, III, Frederick Alyious ^[1]; Paranthaman, Mariappan Parans ^[1]; Rupich, M. W. ^[2]; Zhang, W. ^[2]; Xie, Y. Y. ^[3]; Selvamanickam, V. ^[3]

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1. ORNL
2. American Superconductor Corporation, Westborough, MA
3. SuperPower Incorporated, Schenectady, New York

Reduction of ac losses in applied ac fields can be accomplished through either the creation of filaments and bridging in YBCO coated conductors or an assembly of narrow width YBCO tapes. The ac losses for each of these geometries were measured at 77 K in perpendicular ac fields up to 100 mT. While ac loss reduction was achieved with YBCO filaments created through laser scribing and inkjet deposition, the assembly of stacked YBCO conductor provides an alternative method of ac loss reduction. When compared to a 4-mm wide YBCO coated conductor with a critical current of 60 A, the ac loss in a stack of 2-mm wide YBCO coated conductors with a similar total critical current was reduced. While the reduction in ac loss in a 2-mm wide stack coincided with the reduction in the engineering current density of the conductor, further reduction of ac loss was obtained through the splicing of the 2-mm wide tapes with low resistance solders. To better determine the practicality of these methods from a stability point of view, a numerical analysis was carried out to determine the influence of bridging and splicing on stability of a YBCO coated conductor for both liquid nitrogen-cooled and conduction cooled geometries.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: OE USDOE - Office of Electric Transmission and Distribution
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931705
• Journal Information: Physica C, Journal Name: Physica C Vol. 463-465; ISSN 0921-4534; ISSN PHYCE6
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
AC LOSSES
CRITICAL CURRENT
CURRENT DENSITY
DEPOSITION
LASERS
NUMERICAL ANALYSIS
SPLICING
STABILITY
YBCO tapes
ac loss
conductor stability
filamentization