Papers by Keyword: High Temperature Superconductor (HTS)

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Authors: Jun Zheng, Hai Lian Jing, Xing Lin Liao, Da Bo He, Ji Fu Chen, Su Yu Wang
Abstract: Different from other applications, this paper explores how to use the stable high-Tc superconducting (HTS) magnetic levitation (maglev) to lift the sculpture art to a high levitation position for satisfying the artists requirement for the light artistic concept. With a combination of the permanent magnet (PM) levitation and HTS maglev technologies, a sculpture model was built to sustain a stable levitation with a levitation height of over 80 mm. In this hybrid HTS maglev sculpture model, three PM rings are arranged as upper, middle, and bottom as a double-layer axial levitation structure; six rectangular YBaCuO bulks are fixed along the side of the PM rings upper-layer as a stabilizer component along the radial direction. When the bottom PM ring was driven up by the lifting bolt, the upper PM ring, which was fixed with the art, can be lifted much higher. Then the required artistic effect will be enhanced. After the model was designed and optimized by finite element method, it was experimentally validated by the HTS maglev measurement system. This levitation design is helpful to the realization of a real-scale levitation sculpture art, and can also provide references to superconducting radial magnetic bearing systems.
Authors: Zi Gang Deng, Jun Zheng, Hong Hai Song, Su Yu Wang, Jia Su Wang
Abstract: For the high temperature superconducting (HTS) magnetic levitation (Maglev) test vehicle in china, the present NdFeB PMG has the symmetrical magnetic field distribution on the upper and lower surface. However, the vehicle only utilizes its upper magnetic field. 50% PMG magnetic field energy goes to waste, so the onboard HTSC arrays haven’t reached the best levitation performance. In order to make the HTS/PMG maglev system more efficient and reasonable, a new HTS/PMG Maglev design has been proposed based on the present PMG and the Halbach array PMG, whose PMG is called as hybrid PMG. Firstly, three magnetic field distributions of three kinds of PMG are compared using FEM. It is found that the magnetic field distribution of the hybrid PMG is more efficient for the HTSC’s maglev. The concentrating upper surface magnetic field is stronger to improve the load capability of the system. Numerical analysis and experiment are close for the present HTS/PMG system. More calculation shows that the bulk YBaCuO HTSC with the hybrid PMG has significantly better levitation performance than that with the other two PMGs. The usage of the onboard HTSC arrays is improved much and the load capability of the HTS/PMG Maglev vehicle is upgraded with the hybrid PMG.
Authors: Feng Feng, Ti Ming Qu, Kai Shi, Rong Xia Huang, Wei Wu, Yan Yi Zhang, Shao Zhu Xiao, Jun Jun Wei, Xiao Hao Wang, Zheng He Han
Abstract: on beam assisted deposition (IBAD) is an important technique to fabricate the second generation high temperature superconducting (2G HTS) wires. Among the fabrication routes of 2G HTS long wires, IBAD route achieved the best performance in recent years. IBAD was adopted in this field in 1991 to obtain biaxially textured buffer layers, which helped to deposit high quality YBCO superconducting films on metallic substrates for the first time. Series of experimental and industrial researches on IBAD were carried out by many groups worldwide. And in the researches lasting for over two decades, the focused material for IBAD was changed from Yttria-Stabilized Zirconia (YSZ), Gd2Zr2O7 (GZO) to MgO. In this paper, the research progresses and the main achievements were briefly reviewed.
Authors: Zheng Rong Zhang, Kazuyoshi Sekine
Abstract: In order to obtain a sharply cube textured silver sheet as the substrate for high temperature superconductor (HTS) film with high Jc (critical current density), warm rolling combined with two step annealing treatment has been performed to clarify the perspective of texture formation in pure silver. Two kinds of starting material, which are silver ingots of commercial purity obtained by casting in air and vacuum, were used to examine the effect of oxygen on texture development. The main feature of warm rolling texture obtained in this study was a strong Brass {011}<211> component with minor S {123}<412> component, and in some cases, cube {001}<100> component or Copper {112}<111> component appeared also depending on the warm rolling procedures. Upon crystallization, {001}<100>, {124}<4,12,7> and {13,6,15}<365> orientations were formed as the dominant components in silver sheets and the relative amount of their orientation components depended on the concrete annealing conditions applied and on the oxygen content. A very sharp single-crystal like cube texture has been successfully realized in the specimen, which was cast in vacuum, warm rolled by 95 percent and subsequently annealed as 1500C×10 min-5000C×30 min in nitrogen. Finally, we discussed the technological basis on sharp cube texture formation in f.c.c. pure metals with low stacking fault energy.
Authors: Sabah Jalal Fathi
Abstract: The electrical resistivity of high temperature superconductivity Tl2-xHgxBa2Ca2Cu3O10- δ has been measured in the temperature range from 90K to 330K. These results showed that the critical temperature of the zero resistivity increases from 127K to 138K ,when the Hg concentration increased from 0 to 0.5. The structure of the Tl2-xHgxBa2Ca2Cu3O10-δ compound has also investigated by using X- ray diffraction technique. This compound has tetragonal type structure with a=b=5.36A & c=36.09A and the magnitude of c-axis increases to 37.8A when x increased to 0.5. Nano ZnO was add to the sample with concentration (0-1) wt% of the ( Tl2- xHgxBa2Ca2Cu3O10- δ) samples mass. The effect of the nano ZnO concentration substitution on the samples investigated on structure and critical temperature of the best sample properties (when x=0.5)and showed that the structure remains tetragonal and c-axis increased to 39.2A when nano sized concentration 0.8% and Tc increase to 146K but c-axis decreased to 38.4A and Tc decreased to 143K when the ZnO concentration 1%.
Authors: M. Segarra, L. Miralles, J. Díaz, H. Xuriguera, J.M. Chimenos, F. Espiell, S. Piñol
Authors: Susil K. Putatunda, Khurpa S. Vijayaragavan, Gavin Lawes
Abstract: Superconducting thin films of magnesium diboride (MgB2) has been synthesized on various substrates such as gold, silver, copper and silicon using a novel electroless plating technique. The microstructures and the superconducting properties of these films have been characterized using X-ray diffraction, scanning electron microscopy and temperature dependent magnetometry. X-ray diffraction measurements confirm that the films are crystalline magnesium diboride with some impurity phases. Clear evidence for a superconducting transition in the magnetization measurements was observed.
Authors: Wen Tao Huang, Meng Song, Nan Nan Hu, Kun Nan Cao, Dong Dong Lu, Jiao Du, Chao Liu, Ren Kai Niu
Abstract: With the development of high voltage long distance transmission and expansion of the grid, continuous reactive power compensation devices, such as controllable reactor, become more and more important. This paper describes the design and prototype test of a high leakage reactance transformer-based high temperature superconducting controllable reactor (HLRT-HTSCR). Characteristics test results show the excellent impedance regulation characteristic of the prototype. DC critical current test of the superconducting winding shows that attention should be paid to the critical current of superconducting coil, avoiding over-current condition. This paper reveals the characteristics of HLRT-HTSCR by experiment, and will be of important practical significance to promote its development.
Authors: Peng Cheng, Geng Wang, Peng Qin, Feng Yan Li
Abstract: With the development of high temperature superconductor (HTS) material, countries all over the world have shown great attention in HTS generator over the theoretical research and application. In this paper, a 3MW high temperature superconductor wind generator has been designed by using the RM and Maxwell 2D module of FEM software Ansoft. This design use the second generation HTS material YBCO bulk to be the permanent magnet. It break through the capability limitation of the traditional permanent magnet generation. Based on the FEM simulating, calculating and changing the parameter, the data of the HTS wind generator has been shown, such as magnet line of force, magnetic-field distribution and so on. Compared with the traditional permanent magnet generation, the HTS wind generator has a strong superiority in various aspects.
Authors: Jia Zheng Lu, Hong Xian Zhang, Li Yang, Dong Hui, Zhen Fang, Bo Li
Abstract: Short current limiting technology is a hot problem in power grid with short current increasing. Several short current limiting technologies are analyzed. And improved bridge-type superconductor current limiter which can limit instantaneous and steady short current is presented. Resistance-type, bridge-type and improved bridge-type superconductor current limiter are simulated. Scheme and parameters are proposed, based on which we develop a 10 kV high-temperature superconductor current limiter. In Aug.14th, short testing implements at Gaoxi 110 kV power station in Loudi bureau, Hunan Province. Later, the limiter runs in the power grid. In short testing, the limiter can prevent the short current from 3500 A (Vms) to 635 A(Vms). There is no saltation in wave. The superconductor current limiter has run six month and all indexes are well-balanced. All these can make a base for superconductor current limiter large-scale application.
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