To minimise the (alternate current) AC loss, multi-filament high-temperature superconducting (HTS) costed conductors (CCs) have been investigated for years. Many methods for striating the HTS CCs are developed and proven effective, such as laser cut and mechanical cut. This paper presents a novel approach to create the filamentary structure. Instead of cutting the HTS tape after manufacture,...
When the HTS tapes in the quasi-isotropic cable are insulated in middle but soldered together at terminals, it is call partially coupled quasi-isotropic cable. There are resistances at soldered parts which would form closed current loops. When the cable is carrying DC current and subjected into AC magnetic field at the same time, it would induce coupling current and change the current density...
Recently, a Wireless Power Transmission (WPT) system has been attracting attention for automobiles and electric railways. However, the power transmission efficiency in the conventional WPT system composed of copper coils is not high enough due to large resistance. Therefore, we have investigated the effectiveness of applying REBCO coils to WPT system. Since the increase AC loss of the REBCO...
AC applications of REBa2Cu3Oy (REBCO) superconducting tapes require large current capacity and low AC loss properties. We have already proposed transposed parallel conductors in our previous study on the development of superconducting power transformers and rotating machines. The parallel conductor with the optimal transposition does not induce the additional AC loss. However, if the...
One of the properties in superconductor is perfect diamagnetism called as Meissner effect. Among superconductors, YBa2Cu3O7-δ (YBCO) polycrystals has high critical temperature (Tc) over 90 K and high critical current density (Jc) of the order of 104 A/cm2 at 77 K in self-magnetic field［1］, so it is expected as a material for shielding magnetic field under liquid nitrogen cooling. Concerning to...
One of the practical applications of the second generation HTS tapes (or CC – coated conductors) lays in the area of development of superconducting magnetic energy storages (SMES). In particular, HTS SMES will be applied for charging pulse mode magnets used in particle accelerators. The important particularity of such magnets is the rapidly changing operating current and magnetic field at low...
Recently, we proposed a REBCO split wire having multi-core structure. The split wire is fabricated by separating the REBCO layer using the commercial REBCO-coated conductor. The fabrication method is electrical separating by bending stress (ESBS) and electrical separating by pressure concentration method (ESPC) [1]. In the measurement of the screening current induced magnetic field, that was...
Commercial HTS coated conductors exhibit asymmetric Ic (B,θ) characteristics, where θ is defined as the angle between the applied magnetic field and normal component of the superconductor plane. Previous works reported influence of Ic (B, θ) characteristics on dynamic resistance in a coated conductor and AC loss of coil windings wound with coated conductors. However, the influence of...
