TY - JOUR
T1 - Analysis of discharging characteristics in a Bi-2223/Ag coil for SMES with consideration of cooling capacity of a cryocooler
AU - Higashikawa, Kohei
AU - Nakamura, Taketsune
AU - Okamoto, Hiroshi
N1 - Funding Information:
Manuscript received September 20, 2005. This work was supported in part by the Iwatani Naoji Foundation under a research grant and in part by the 21st century COE Program 14213201 in Japan.
PY - 2006/6
Y1 - 2006/6
N2 - 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.
AB - 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.
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U2 - 10.1109/TASC.2006.870008
DO - 10.1109/TASC.2006.870008
M3 - Article
AN - SCOPUS:33746619286
SN - 1051-8223
VL - 16
SP - 578
EP - 581
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
M1 - 1642915
ER -