Physica C-superconductivity and Its Applications最新文献_第7页

Structure design of 500 kVA HTS transformer and Joule loss in superconducting windings 500 kVA HTS 变压器的结构设计和超导绕组的焦耳损耗

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-02 DOI: 10.1016/j.physc.2024.1354482

Anpeng Shu , Binyi Tian , Shaonan Chang , Yuantong Ma , Wei Pi

{"title":"Structure design of 500 kVA HTS transformer and Joule loss in superconducting windings","authors":"Anpeng Shu , Binyi Tian , Shaonan Chang , Yuantong Ma , Wei Pi","doi":"10.1016/j.physc.2024.1354482","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354482","url":null,"abstract":"<div><p>HTS transformers can provide lower loss and higher efficiency with smaller size and lighter weight compared with traditional transformers. In this paper, we designed a 500 kVA HTS transformer and developed its simulation using finite element software based on the <em>H</em>-formulation, and the simulation incorporates a heat model and <em>E-J</em> power law. The simulation shows that there is a large radial flux leakage at the end of the low-voltage (LV) windings (superconducting windings), leading to a reduction in critical current density and an associated increase in joule loss in the LV winding. In order to reduce joule loss, various LV winding structures were designed. The results demonstrate that either increasing the axial distance between the coils at the LV winding end or installing a flux diverter outside the LV windings can effectively diminish the radial flux leakage at the LV winding end, consequently reducing joule loss in the LV winding. The impact of the size, position and relative permeability of the flux diverter on radial flux leakage and joule loss are also studied. These structure optimizations and the corresponding effects have important significance to the design of HTS transformers.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"620 ","pages":"Article 1354482"},"PeriodicalIF":1.7,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140818255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and Thermal Analysis of a 250 MVA HTS Transformer for Substation of Offshore Wind Farms 海上风电场变电站用 250 MVA HTS 变压器的设计与热分析

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-02 DOI: 10.1016/j.physc.2024.1354503

Mahdi Mahamed, Seyyedmeysam Seyyedbarzegar

{"title":"Design and Thermal Analysis of a 250 MVA HTS Transformer for Substation of Offshore Wind Farms","authors":"Mahdi Mahamed, Seyyedmeysam Seyyedbarzegar","doi":"10.1016/j.physc.2024.1354503","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354503","url":null,"abstract":"<div><p>In Offshore Substations (OSs), using High Temperature Superconducting (HTS) transformers instead of conventional power transformers to reduce operational and construction limitations such as weight, capacity, marine pollution, and future planning can be considered as desirable. HTS transformers can reduce operating system costs in wind power plant development programs. However, OSs have specific operating conditions in fault mode that should be considered in the design HTS transformers.</p><p>In this paper, a 250 MVA 33/220 KV HTS transformer is designed, and electromagnetic analysis is done in normal conditions to calculate AC loss and thence to design the cooling system. The second step, thermo-flow analysis is done by Finite Element Method (FEM) to calculate the temperature distribution of the windings. Increasing turbulence of inlet flow and creating a porous coating on the tapes are used in this transformer to increase the heat-transfer rate. lastly, the specifications of the HTS transformer are compared with the conventional transformer to give useful information to OS designers to investigate using novel construction ideas such as floating OS by HTS transformer.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"620 ","pages":"Article 1354503"},"PeriodicalIF":1.7,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140818257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of sintering time on the characteristics of YBCO coated-conductor joints using nano-silver paste 烧结时间对使用纳米银浆的 YBCO 涂层导体接头特性的影响

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-02 DOI: 10.1016/j.physc.2024.1354485

Ming Wang , Wentao Wang , Leilei Han , Jiajun Chen , Yu Chen , Yun Wu , Yong Zhao

{"title":"Effect of sintering time on the characteristics of YBCO coated-conductor joints using nano-silver paste","authors":"Ming Wang , Wentao Wang , Leilei Han , Jiajun Chen , Yu Chen , Yun Wu , Yong Zhao","doi":"10.1016/j.physc.2024.1354485","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354485","url":null,"abstract":"<div><p>Jointing YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-z</sub> (YBCO) superconducting coated-conductor (CC) tapes is becoming increasingly significant for magnet applications because of the limited length of single tapes. In this work, YBCO CC tapes stabilized by silver were connected by low-temperature sintering of nano-silver paste. The effect of sintering time and lapped length on the electrical properties of YBCO joints were systematically investigated. And the correlation between microstructure and bonding force of the joints with extending the sintering time was established. It is found that joints sintered within 1∼5 min exhibit relatively lower resistance, while the maximum axial tensile strength at room temperature (RT) was improved with increasing sintering time. Considering the electromechanical properties, ten min is selected as the optimal sintering time for nano-silver paste. The joint by this efficient technology possesses closely connected interface, similar critical current and axial tensile strength (RT) to the single CC tape. The joint resistivity is as low as ∼12.5 nΩ·cm<sup>2</sup>, which is much less than the traditional soldering joint.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"620 ","pages":"Article 1354485"},"PeriodicalIF":1.7,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140818258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical behavior of multi-layer CORC cable in high external field with 3D numerical model 利用三维数值模型分析多层 CORC 电缆在高外电场中的机械行为

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-02 DOI: 10.1016/j.physc.2024.1354501

Shouhong Shan , Huadong Yong , Youhe Zhou

{"title":"Mechanical behavior of multi-layer CORC cable in high external field with 3D numerical model","authors":"Shouhong Shan , Huadong Yong , Youhe Zhou","doi":"10.1016/j.physc.2024.1354501","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354501","url":null,"abstract":"<div><p>The degradation of critical current due to mechanical deformation in a high field has a profound impact on the performance of high-temperature superconducting (HTS) structures. The multi-layer conductor on round core (CORC) cable is a widely-applied HTS structure in engineering. Due to the complexity of the multi-layer CORC cable, the contact between the tapes should be considered when simulating the mechanical behavior in high field. In this paper, 3D electromagnetic and mechanical models were developed to investigate the mechanical behavior of the multi-layer CORC cable. Under the same electromagnetic force, the comparisons of mechanical models of a 5-layer CORC cable with different contact methods are presented. Subsequently, the effects of the loading path of the external magnetic field and transport current, the bending geometry of the CORC cable, the winding direction of the HTS tape in the CORC cable, and the shielding current on the mechanical behavior are discussed, respectively. The numerical results are useful for the design and operation of CORC cable in high field.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"620 ","pages":"Article 1354501"},"PeriodicalIF":1.7,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140818256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced conductivity in Sr doped La3Ni2O7-δ with high-pressure oxygen annealing 高压氧气退火增强掺杂硒的 La3Ni2O7-δ 的导电性

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-04-24 DOI: 10.1016/j.physc.2024.1354504

Keke Jiao , Rui Niu , Huixin Xu , Weili Zhen , Jingrong Wang , Changjin Zhang

引用次数: 0

Thermomagnetic instability in superconducting lead-porous glass nanocomposites 超导铅多孔玻璃纳米复合材料中的热磁不稳定性

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-04-12 DOI: 10.1016/j.physc.2024.1354502

A.E. Shitov, N.Yu. Mikhailin, Yu.A. Kumzerov, D.V. Shamshur

{"title":"Thermomagnetic instability in superconducting lead-porous glass nanocomposites","authors":"A.E. Shitov, N.Yu. Mikhailin, Yu.A. Kumzerov, D.V. Shamshur","doi":"10.1016/j.physc.2024.1354502","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354502","url":null,"abstract":"<div><p>In this paper we examine the mechanisms leading to thermomagnetic instability in nanostructured materials and study their regularities. The appearance of thermomagnetic instabilities in the superconducting state of various materials remains one of the problems of applications of superconductors. We studied the temperature and the magnetic field dependences of the magnetization <em>m(T, H)</em> and heat capacity <em>C(T, H)</em> of a nanocomposite consisting of interconnected lead filaments embedded in nanoporous glass (Pb-PG) with filament diameter <em>d</em> = 7 nm. Porous glass contains an arbitrarily orientated multiply connected system of pores of approximately the same size; lead in the nanocomposite forms a replica of the pore system. Thermomagnetic instability was previously observed in this material in superconducting state at <em>T</em> ≤ 5 K on <em>m(H)</em> dependencies in magnetization studies. We established that high enough external heater power <em>P</em> used during the heat capacity measurements in external magnetic field <em>C(H)</em> at <em>T</em> ≤ 5 K can initiate thermomagnetic instability and penetration of magnetic flux into the nanocomposite. The thermomagnetic instability is generally preceded by a sequence of small heat release events with the same magnitude as <em>P</em>. Another sequence of small heat release events is observed in the region close to <em>H<sub>c2</sub></em>. These events are presumably linked to the thermomagnetic instability process and are caused by small redistribution of magnetic flux in the nanocomposite.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"620 ","pages":"Article 1354502"},"PeriodicalIF":1.7,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140551514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Further analysis of flux trapping experiments on hydrides under high pressure 高压下氢化物通量捕获实验的进一步分析

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-04-12 DOI: 10.1016/j.physc.2024.1354500

J.E. Hirsch , F. Marsiglio

引用次数: 0

Investigation of the effect of conformal pinning array on critical current density in infinitely long superconductors 研究共形钉阵对无限长超导体临界电流密度的影响

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-04-03 DOI: 10.1016/j.physc.2024.1354498

Sara Zoveydavi , Mehdi Hosseini , Zahra Owjifard , Ali Moftakharzadeh

引用次数: 0

Magnetic field-to-voltage coefficient evaluation of axial SQUID gradiometer in unshielded environment 非屏蔽环境下轴向 SQUID 梯度仪的磁场-电压系数评估

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354468

Zhidan Zhang, Xuesong Feng, Wenqi Wu, Hai Wang, Xiangyan Kong

{"title":"Magnetic field-to-voltage coefficient evaluation of axial SQUID gradiometer in unshielded environment","authors":"Zhidan Zhang, Xuesong Feng, Wenqi Wu, Hai Wang, Xiangyan Kong","doi":"10.1016/j.physc.2024.1354468","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354468","url":null,"abstract":"<div><p>Due to the existence of earth magnetic field, it is difficult to detect weak magnetic field from some parts of the body like heart, muscle, nerve and so on. In addition to the requirement for high-sensitivity magnetic field sensors, it is also essential to take certain measures to suppress noise. The axial gradiometer based on low-Tc Superconducting QUantum Interference Device (SQUID) can achieve a noise suppression ratio of 30 dB through the spatial gradient difference of the magnetic field, but the calibration of the magnetic field-to-voltage coefficient (B-V coefficient) generally requires a magnetically shielded room (MSR), which is complex and costly. With finite element simulation and practical experiments, a calibration method for B-V coefficient of the axial hardware gradiometer without shielding was presented in this paper. That is, a larger calibration field was generated for coefficient evaluation in an unshielded environment. At the same time, when the test signal was far away, the spatial gradient difference was used to improve the authenticity of the evaluation results. Through simulation and experimental verification, for the same performance and configuration of the gradiometer, the calibration result was 1.6 nT/V with 0.1 nT/V difference from that in a shielding room. The results showed that the unshielded evaluation method proposed in this paper was practical and could be used to evaluate the B-V coefficient of gradiometer.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354468"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140309326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic and Thermal analysis of an Intra-layer no-insulation coil during Quench 淬火过程中层内无绝缘线圈的电磁和热分析

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354477

Kangshuai Wang , Yong Chen , Qiuliang Wang , Quanyue Liu , Lei Wang , Jianhua Liu

{"title":"Electromagnetic and Thermal analysis of an Intra-layer no-insulation coil during Quench","authors":"Kangshuai Wang , Yong Chen , Qiuliang Wang , Quanyue Liu , Lei Wang , Jianhua Liu","doi":"10.1016/j.physc.2024.1354477","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354477","url":null,"abstract":"<div><p>The intra-layer no-insulation (LNI) layer-wound REBCO coil has been widely studied for its excellent high thermal stability in the research of nuclear magnetic resonance superconducting magnets. Due to the complex structure of the LNI layer-wound coil and the numerous factors that affect thermal stability, its quench characteristics are not clear. In this paper, a numerical multiphysics coupling model is established to study the transient electromagnetic and thermal behaviors of the LNI layer-wound coil during quench. The results indicate that temperature follows the diffusion law, while the currents evolve through electrical connection and electromagnetic induction. Due to the high contact resistance, the azimuthal current and axial current vary almost in units of the entire coil layer. The direction of the radial current upstream of the turn where a quench occurs is positive due to the bypassing behavior, while the radial current direction is negative downstream. The insulation material inside the LNI layer-wound coil strongly affects the quench propagation. When its thickness decreases, the equivalent radial thermal conductivity increases, thereby increasing the quench propagation velocity and current peak, and shortening the duration of the current response during quench.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354477"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140309327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0