Reduction in AC Loss of REBCO Coils with Optimum Multi-Width Tape Induced by Part Slitting Method
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ORIGINAL PAPER
Reduction in AC Loss of REBCO Coils with Optimum Multi-Width Tape Induced by Part Slitting Method Changxin Chi 1
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Chuanbing Cai 1 & Yanqun Guo 1 & Difan Zhou 1 & Weihua Yan 1 & Tanyuan Zou 1 & Chuanyi Bai 1
Received: 29 March 2020 / Accepted: 7 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The width of REBCO (REBa2Cu3O7-x, RE: rare earths)-coated conductor is an important factor associated with AC (alternating current) loss of the tape. In the same electromagnetic environment, coils winding with narrow REBCO tapes generate less AC loss than the wide one. For a single coil, the critical current density of outer turns is higher than that of inner turns, due to the inhomogeneous distribution of magnetic field. This paper presents a multi-width technique which is applicable for single REBCO coil by partly slitting single tape in place, which can effectively reduce AC loss, while maintaining current-carrying capacity in high field. The AC loss of coils with slitting in different turns is calculated by the software of finite element modeling (FEM). The results indicate that the appropriate slitting in radially outer turns of coil appears effective to reduce AC loss, especially in the case of the coils running with high current. Keywords AC loss . REBCO coil . Slit . Finite element method . Multi-width
1 Introduction The second-generation high-temperature superconductor (2G-HTS) tapes are applicable for power system benefitting from the high critical temperature (Tc) and high critical current density (Jc) in magnetic field [1]. Generally, HTS coils are the core components of superconducting electrical facilities, such as transformer, current limiter, energy storage, and Mag-lev train, of which the coils are normally operated in alternating current (AC), accordingly to give rise to AC loss. The generated heat will affect the stability of power system, and then increase the consumption of refrigeration. Therefore, it is significant to optimize the architectures of tapes to reduce the AC loss of coils. The existing publications indicated key factors of AC loss, such as the winding construction, coil stress, applied current intensity and frequency, applied magnetic field intensity, and the width of 2G-HTS tapes [2–6].
* Chuanbing Cai [email protected] 1
Shanghai Key Laboratory of High Temperature Superconductors, Physics Department, College of Sciences, Shanghai University, Shanghai, 200444, China
It is known that the AC loss for single wide superconducting tape is higher than that of several narrow tapes with identical current. Therefore, multifilamentary tapes were proposed to manufacture as the superconducting cables and coils, to achieve a lower AC loss [7–10]. As the higher magnetic field is, the lower critical current density of superconductor is; inhomogeneous distribution of magnetic field leads to nonuniform critical current density in different coil position, e.g., generally, 2G HTS winding is consisted of several pancake coils, with stacking along th
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