Abstract
Previous studies on magnetization AC loss of high temperature superconducting (HTS) coated conductors (CCs) taken into account the ideally sinusoidal external magnetic field, or non-sinusoidal by considering only the harmonics in phase with the fundamental component. However, realistically magnetic field often contains harmonics with different phase angles and amplitudes. In this paper, magnetization AC loss in HTS CC was studied, considering the phase angle φ of each harmonic; assuming superconductor is subjected to external magnetic field which is distorted by the 3 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rd</sup> and the 5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> harmonics. Phase angle of each harmonic was considered in the range of 0 to π and amplitude of fundamental magnetic field, was assumed as 10, 20, 50, and 100 mT. Different distortion level of magnetic field was considered too. It is concluded that phase angle of field harmonic has a significant effect on magnetization loss of HTS CCs.
Highlights
Large scale power applications of high temperature superconductors (HTS) have attracted tremendous attention in recent decades thanks to their advantages such as high current-carrying capacity, and low losses, for the cryoelectrification in both grid and specially in transportation systems, including rail, marine, and aviation applications [1]–[7]
high temperature superconducting (HTS) coated conductors (CCs) in these applications are mostly exposed to external magnetic field, which is ideally expected to be purely sinusoidal [7], [8]
2) When an HTS CC is exposed to nonsinusoidal external magnetic field with the 3rd harmonic at a given B1, magnetization loss, Qm changes at different φ value
Summary
Large scale power applications of high temperature superconductors (HTS) have attracted tremendous attention in recent decades thanks to their advantages such as high current-carrying capacity, and low losses, for the cryoelectrification in both grid and specially in transportation systems, including rail, marine, and aviation applications [1]–[7]. The magnetic field would not be purely sinusoidal and will contain harmonics Such distorted magnetic fields cause extra losses in different parts of the machine, from core to HTS coils/windings [10]–[14]. M. Yazdani-Asrami et al.: Magnetization Loss in HTS CC Exposed to Harmonic External Magnetic Fields a circular HTS double pancake coil under three different nonsinusoidal current/magnetic fields, including saw-tooth, triangle, and square waveforms, were measured and modelled considering the effect of amplitude, orientation angle, and frequency of applied waveforms. We carried out comprehensive numerical calculations to investigate the magnetization loss in HTS CC subjected to distorted external magnetic field with the 3rd and the 5th harmonic orders at different phase angles ranging from 0 to 2π. The effect of distortion level of different harmonic orders on magnetization loss in HTS CC was discussed
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