Title :
Eddy-Current Losses of a HT-SMES Coil Under Controlled and Uncontrolled Discharge Conditions
Author :
Chen, Xiao Yuan ; Jin, Jian Xun
Author_Institution :
Center of Appl. Supercond. & Electr. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
This paper presents an analytical approach of eddy-current loss in a high temperature superconducting magnetic energy storage coil based on finite-element algorithm and numerical circuit analyses. A solenoidal coil with step-shaped cross-sectional shape is introduced to reduce the total eddy-current loss of the whole coil by diminishing the eddy-current losses located at two coil ends. Two coil-current-dependent formulas are derived to estimate the eddy-current loss, e.g., 294 J for a 1.2 H/880 A Bi-2223 solenoidal coil in a 1000 V/500 kW constant-power energy discharge process and then the uncontrolled energy discharge process.
Keywords :
bismuth compounds; calcium compounds; eddy current losses; finite element analysis; high-temperature superconductors; strontium compounds; superconducting coils; superconducting magnets; Bi-2223 solenoidal coil; Bi2Sr2Ca2Cu3O10+x; HT-SMES coil; coil-current-dependent formulas; constant-power energy discharge process; controlled discharge condition; eddy-current loss; finite-element algorithm; high temperature superconducting magnetic energy storage coil; numerical circuit analysis; power 500 kW; step-shaped cross-sectional shape; uncontrolled energy discharge process; voltage 1000 V; Coils; Discharges (electric); High-temperature superconductors; Magnetic fields; Metals; Superconducting magnetic energy storage; Controlled energy discharge; eddy-current loss; magnetic field; superconducting coil; superconducting magnetic energy storage (SMES);
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2014.2344753
