Analysis of Discharging Characteristics in a Bi-2223/Ag Coil for SMES With Consideration of Cooling Capacity of a Cryocooler

Author

Higashikawa, Kohei ; Nakamura, Taketsune ; Okamoto, Hiroshi

Author_Institution

Dept. of Electr. Eng., Kyoto Univ.

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

578

Lastpage

581

Abstract

We investigated discharging characteristics of a Bi-2223/Ag coil by means of thermo-electromagnetic coupled analysis. The objective was to evaluate the thermal behavior of conduction-cooled high temperature superconducting (HTS) coils when they are applied to superconducting magnetic energy storage (SMES) systems for voltage dip compensation. The electromagnetic analysis adopted finite element method (FEM) considering the J-E expressions, which can quantitatively estimate the experimental data obtained from the tape in wide ranges of temperature (20-77 K), external magnetic field (0.02-3 T) and its applied direction (arbitrary). The thermal analysis also employed FEM, and was performed under new boundary condition where heat flow rate into a cryocooler does not exceed its cooling capacity. It was shown that transient temperature rise occurred in the coil during discharging, and such temperature rise was underestimated for generally applied boundary condition, i.e., fixed value of temperature

Keywords

bismuth compounds; calcium compounds; cooling; cryogenics; finite element analysis; high-temperature superconductors; lead compounds; silver; strontium compounds; superconducting coils; superconducting magnet energy storage; superconducting tapes; thermal analysis; (BiPb)₂Sr₂Ca₂Cu₃O ₁₀-Ag; 20 to 77 K; SMES; cooling capacity; cryocooler; discharging characteristics; finite element method; heat flow; high temperature superconducting Bi2223-Ag coil; magnetic field; superconducting magnetic energy storage system; superconducting tapes; thermal behavior; thermo-electromagnetic coupled analysis; transient temperature rise; voltage dip compensation; Boundary conditions; Cooling; High temperature superconductors; Magnetic analysis; Samarium; Superconducting coils; Superconducting films; Superconducting magnetic energy storage; Thermal conductivity; Voltage fluctuations; Cooling capacity; HTS coil; SMES; discharging characteristics; finite element method;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2006.870008

Filename

1642915