The partial insulation winding was examined to ameliorate the slow charge–discharge shown by coils wound without insulation. Single pancake of GdBCO coated conductor were insulation, with kapton tape every five turns, and full use tape. They characterized charge–discharge, sudden discharge, over-current testing. improved charging discharging high thermal electrical stabilities partially insulated coil demonstrate its potential for in HTS power applications.

GdBCO single-pancake coils wound with Kapton insulation every 3, 6, 9 turns, and without insulation, were characterized by charge–discharge over-current tests. The magnetic field saturation at higher currents than the critical current was affected portion of insulated turns that restricted surplus flow away from azimuthal path. delay decreased increase which suggested partial winding may be effective for use in HTS power applications. Magnetic loss reduced excessive high mainly decrease...

Here we report the effect of an external magnetic ripple field on electromagnetic characteristics GdBCO racetrack coils being operated with a constant DC current. Two types coils, one wound without turn-to-turn insulation (NI) and other Kapton tape (INS), were examined under fields generated by permanent magnet mounted rotor, which was driven separate AC motor. The voltage fluctuations variations measured respect to intensity (BERF), rotating speed, operating condition. When INS NI exposed...

The reliability of high temperature superconducting (HTS) racetrack coils is one the most important factors for development large-scale rotating machines. However, it necessary to investigate stability and normal zone propagation characteristics applications such as ship propulsion motors power generators. In this study, quench/recovery a racetrack-type, double pancake (DP) coil, which could be applied HTS machines, were investigated using voltage profiles in cryogenic conduction cooling...

Quench protection is one of the most important issues for magnet applications using 2 G HTS tapes because their non-self-protecting properties. Although many researchers have examined quench/recovery characteristics magnets to establish required stability, new information on recently commercialized with GdBCO CC needed. In this study, Zr-doped (Gd,Y)BCO pancake coils that were insulated various materials, such as copper and Kapton tapes, in a liquid nitrogen (LN2) bath. The minimum quench...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The stabilizer of a YBCO coated conductor (CC) plays very important role in bypassing the over-current and transferring heat generated at moment fault. Therefore, one big issues is to determine best material for its dimensions high performance HTS power application system. In case superconducting fault current limiter (SFCL), which requires it react immediately any fault, characteristics are...

The superconducting properties of YBCO (yttrium barium copper oxide) coated conductors (CCs) are strongly dependent on their oxygen content. Degradation the a CC can occur due to phase/structure transition caused by diffusion out during heat-treatment or soldering, which is an inevitable process creation joint. Such variations in generally functions temperature and partial pressure (PO2). Therefore, order for joint be feasible, it important examine changes microstructure behavior CCs. This...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Recently, a cooling system using solid cryogen such as nitrogen (SN2), was introduced for high temperature superconducting (HTS) magnet applications. In order to apply the SN2 successfully HTS applications, it is essential obtain sufficient data regarding characteristics of SN2-cooled YBCO-coated conductor (CC), including thermal and electrical properties. Therefore, this study examined effect on...

LN <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> is used as an insulating material well a cryogen for 154 kV class HTS transformer. However, main insulation with not enough, and thus, research on barrier has been performed. The most of experiments this effect are combination paper air (air, SF xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> , etc.), also the results from these insufficient to be practically electric design Moreover,...

This paper reports an acoustic emission (AE) technique that was developed for detecting the quenching and stability characteristics of high-temperature superconductors (HTSs), particularly a BSCCO-2212 monofilar component resistive superconducting fault current limiter (SFCL) system. The 24 kV class SFCL, which recently by KEPRI-LSIS collaboration group in Korea, requires almost 150 components. A HTS undergoes thermal mechanical stress creating microcracks during after or reaching state such...

Interest in electromagnetic shielding of cement-based materials is increasing to protect human health and electronic equipment from interference (EMI). EMI effectiveness can be reduced by cracking, thus cracking behavior a major factor influencing reduction cracked cementitious composites. In this study, the effects hybridization fibers on non-cracked ultra-high-performance fiber-reinforced composite (UHPFRCC) were investigated. UHPFRCC containing 1.5 vol% long steel was considered as...

An electric current produces a magnetic field around lead, which attracts or repels other leads. The electromagnetic forces interacting between leads show different tendencies according to the arrangement of on top flange cryostat and distances them. In case high-current power devices high-field magnets, optimal that can minimize force acting them is one safety issues be considered. this paper, exerted were examined theoretically. results confirmed by measuring strain variations using gauge...