Abstract
High temperature superconducting (HTS) coils of different shapes (typically circular or trapezoidal) wound on iron or ironless core are fundamental components of many superconducting electrical power devices. A 150-turn (75 turns/pancake) trapezoidal coil in double pancake configuration has been designed and realized in our laboratory of ENEA Frascati. Various epoxy resins and YBCO tapes have been tested in the temperature range room to liquid nitrogen, leading us to the choice of AmSC (American Superconductor) tape for the winding and araldite resin for the impregnation process. The trapezoidal shape has been chosen because of its suitable geometry for practical applications, the results being complementary to what was previously achieved on round shaped HTS coils. The AC transport current losses have been measured using a compensated electrical method and expressed in terms of a linearly frequency dependent resistance. A linear dependence of the losses resistance from frequency was expected and found in agreement with previous results. The current-voltage curve has been measured in zero externally applied field condition, the results being in good agreement with a numerical simulation. The magnetic field distributions, at different air gaps from coil top and zero externally applied filed condition, have been simulated and reported as well.
Highlights
Second generation (2G) high temperature superconducting (HTS) coils have a range of applications in electrical devices, such as superconducting fault current limiter (SFCL), superconducting magnetic energy storage (SMES), and superconducting generators and motors
The current dependence of R0(I) is due to transport current losses associated with the coil self-produced magnetic field and is coil geometric configuration dependent
We presented the measured and simulated data on a trapezoidal HTS coil in double pancake configuration
Summary
Second generation (2G) high temperature superconducting (HTS) coils have a range of applications in electrical devices, such as superconducting fault current limiter (SFCL), superconducting magnetic energy storage (SMES), and superconducting generators and motors. Air-gap magnetic flux density, and AC losses analysis of HTS coils components are important steps in complex devices design, determining the application ranges of the rated currents and magnetic fields of superconducting material. The paper is structured as follows: double pancake HTS coil manufacturing process presentation, liquid nitrogen temperature of the coil critical currents presentation and comparison with a FEM model simulation, an electrical measurement method description for the AC condition, AC transport current losses results expressed in terms of an equivalent frequency dependent loss resistance, discussion, and final conclusions
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