Shielding Effect of (RE)Ba₂Cu₃O_7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations

Abstract

Ba 2 Cu 3 O 7-d (REBCO) coated conductors are becoming a preferred wire choice for many potential high temperature superconducting (HTS) applications, where additional metal layers are usually attached to the REBCO conductors to improve reliability and stability. In such cases, the eddy current loss in the metal layers is affected by the magnetic field shielding by adjacent REBCO coated conductors. Here we present the ac loss measurement and simulation results in three copper-superconductor stacks comprising a 10-mm-wide Fujikura-coated conductor with one, two, and four 0.1-mm-thick, 10-mm-wide copper strips, under various applied magnetic field angles (defined by the angle between the applied magnetic field and the wide face of the superconductor) from 15°to 90°at 77 K. The amplitude of the magnetic field is up to 100 mT. The shielding effect, which reduces the eddy current loss in the metal layers stacked with a superconductor layer, increases with decreasing field angles, due to the change of the effective penetration field at the different field angles. The eddy current loss in the copper strips in the copper-superconductor stacks under the magnetic fields with various orientations is dominated by the perpendicular magnetic field component.

Total loss measurement and simulation in a REBCO coated conductor carrying DC current in perpendicular AC magnetic field at various temperatures

“…Three temperature sensors (PT 100) were used to monitor the operating temperature. At each given temperature, the total loss of the REBCO coated conductor was measured using electrical methods: calibration-free method for magnetization loss component [11][12][13] and four-probe method for dynamic resistance/dynamic loss component [22][23][24][25][26]. Calibration-free method uses a pick-up coil which is co-wound with the AC magnet.…”

“…2 , versus the applied perpendicular magnetic field, µ 0 H m , at different frequencies at 77 K, 70 K and 65 K. The normalized Q m0 /(µ 0 H m ) 2 values at different frequencies almost come into a common curve at each temperature, except a very small data disagreement at high magnetic fields. The small discrepancy may be caused by the eddy current loss in the copper stabilizer layers [11,12].…”

Role of asymmetric critical current on magnetization loss characteristics of (RE)Ba2Cu3O7−d coated conductors at various temperatures

“…Magnetization loss measurements were performed using the calibration-free method. 26,27 A detailed description of the measurement system and method can be found in previous works. 26,27 Here, we recap the main features of the measurement setup.…”

“…26,27 A detailed description of the measurement system and method can be found in previous works. 26,27 Here, we recap the main features of the measurement setup.…”

Review on Shielding Mechanism and Structural Design of Electromagnetic Interference Shielding Composites

“…[3,4] Using the thermal effect of microwaves, microwaves are used in mobile communication, radar reconnaissance, satellite signal transmission, and energy transmission, and radio waves are applied to signal transmission of radio and wireless television. [5][6][7] However, owing to the increasingly complex electromagnetic environment, DOI: 10.1002/mame.202100032 electromagnetic radiation pollution has become a significant environmental pollutant, second to air, water, and noise pollutions, becoming the fourth major public hazard. [8][9][10][11][12][13][14][15] Therefore, research on electromagnetic interference shielding and electromagnetic interference shielding composites is crucial.…”