AC losses in Bi-2223 Single-Pancake Coils from 72 to 1152 Hz-Modeling and Measurements

Nuno Amaro, Jan Souc, Enric Pardo, Joao Murta-Pina, Joao Martins, Jose Maria Ceballos, Fedor Gomory

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Studies of ac losses in superconducting materials, particularly in pancake coils, are of great importance for a better understanding of the superconductivity phenomena and its applications in power systems. Due to different technical difficulties, these studies are usually performed considering one of two approaches: considering superconducting coils of few turns and studying ac losses in a large frequency range versus superconducting coils with a large number of turns but measuring ac losses only in low frequencies. In this paper, ac losses are simulated and verified experimentally in a 128 turn Bi-2223 coil in a range of frequencies from 72 Hz till 1152 Hz. Obtained results show a frequency-dependent behavior. Experimental results are compared to those obtained from two different numerical modeling methods: one using commercial software based on finite-element methods and another using a variational method approach. All obtained results agree, validating the simulations and serving as basis for simulations with larger high temperature superconducting coils.

Original languageEnglish
Article number7539279
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number8
DOIs
Publication statusPublished - 2016

Keywords

  • AC losses
  • BI-2223 coils
  • finite-element method (FEM)
  • minimum electro-magnetic entropy production (MEMEP)
  • numerical modeling

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