Abstract
Superconducting rotating machines generate high magnetic fields and for economic application of these machines and to ensure safe and reliable operation accurate assessment of the critical current of the superconductor is required. This paper describes a process to assess the critical current for a HTS synchronous machine with a superconducting rotor using a self-consistent numerical model. The model is used to study the critical current of first generation (1G) Bi-2223 pancake coils under self-field conditions for coil tests as well as within a machine magnetic field under full load conditions. Model results are compared against test measurements on individual HTS pancake coils as well as a double pancake coil in an operating synchronous machine at the Queensland University of Technology (QUT) test facility. Results obtain show that the self-consistent model is fast and accurate in determining the effective critical current of superconductors in such applications. Insights from the modelling assist with the design and optimisation process of the superconducting coils, selection of coil voltage sensing locations to detect the risk of quench and establish safe margins for the superconductor operating current.
Highlights
There is active ongoing interest in high temperature superconducting (HTS) machines which offer unique technology advantages including improved efficiency, higher power density and high electrical stiffness in electric power systems [1]
In this paper we have extended application of the self-consistent model for the process of assessing the effective Ic of Bi-2223 pancake coils in self-field and in the applied field of a HTS synchronous machine
In addition to the magnitude of Ic the model results highlight the influence of the anisotropic Jc(B, θ) of the Bi-2223 superconductor on determination of the location of the turns with a coil which develop a critical electric field
Summary
There is active ongoing interest in high temperature superconducting (HTS) machines which offer unique technology advantages including improved efficiency, higher power density and high electrical stiffness in electric power systems [1]. Bi-2223 tape sample test The critical current of HTS coils within a rotating machine requires knowledge of the superconductor performance with temperature and variation of the magnetic field magnitude B and orientation θ to the tape surface.
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