Application of Flux Diverters in High Temperature Superconducting Transformer Windings for AC Loss Reduction

Fang, Xikui; Wang, Xilian; Sun, Yu; Song, Wenjuan; Pei, Xiaoze; Jiang, Zhenan; Badcock, Rodney A.; Long, Nicholas J.

doi:10.1109/tasc.2021.3108734

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…This was achieved by introducing magnetic flux diverters (MFDs) at the end-windings. We optimized the MFD design by considering different structural arrangements, size and minimizing the AC loss of the HTS winding using T-A and H formulations as noted in [34][35][36][37][38][39][40][41][42].…”

Section: Electromagnetic Designmentioning

confidence: 99%

Design, development, and testing of a 6.6 MVA HTS traction transformer for high-speed train applications

Zhao

Fang

Jiang

et al. 2023

Supercond. Sci. Technol.

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High-temperature superconducting traction transformers (HTSTT) have the merits of small size and lightweight in comparison with their conventional counterparts. This article reports the development progress of a 6.6 MVA HTSTT operating at 65 K, including the design, testing, and system cooling. The introduction of flux diverters and an optimized winding design realized a short-circuit impedance higher than 43% and AC loss less than 3 kW. The insulation structure was designed to pass insulation tests specified in standard in China GB/T 25120-2010. An open cooling system with reduced pressure was developed, which realized the efficiency of the 6.6 MVA HTSTT above 99%. Before assembling the prototype transformer, we conducted tests for critical current and dielectric performance of the HTS double pancake coils (DPC) used in high-voltage (HV) and low- voltage (LV) windings to verify the current-carrying and insulation performances of each DPC. Finally, we measured the critical current and no-load loss of the HTSTT prototype at 77 K. Test results showed that the mass of the transformer is 33% less than conventional transformers. At 77 K, the critical current of the LV winding and HV winding is higher than 700 A and 50 A, respectively. Moreover, the HTSTT on a no-load test reached the test voltage of 25,000 V and loss of 6 kW. In the next step, we will continue to conduct experimental research, and verify the feasibility of the HTSTT on the train, and develop a circulating cooling system, all meeting the commercial requirements of the HTSTT. 

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Section: Electromagnetic Designmentioning

confidence: 99%

Design, development, and testing of a 6.6 MVA HTS traction transformer for high-speed train applications

Zhao

Fang

Jiang

et al. 2023

Supercond. Sci. Technol.

Self Cite

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“…In summary, solenoid has became an indispensable basic component in modern industrial society, serving multiple important fields such as scientific research, energy, transportation, communication, and medical treatment. However, traditional single dense wound solenoids have some drawbacks, such as electromagnetic interference [10][11][12] , high losses [13][14][15] , large volume [16] , and edge effect problems [17][18][19][20] . It is worth noting that the edge effect of the solenoid becomes more pronounced with increasing length, which poses a challenge to its application especially in current sensing systems [21] .…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a novel solenoid with high magnetic uniformity

Zhu,

Xing,

et al. 2024

Preprint

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Currently, solenoids are extensively utilized in various research fields due to their flexibility of fabrication and high magnetic field strength. However, the internal magnetic field of the solenoid itself exhibits some non-uniformity defects, which limits its application in some domains. In this paper, we propose a novel single-wound tightly wound solenoid structure with improved magnetic field uniformity. To optimize the magnetic field near the aperture of the conventional solenoid, an auxiliary solenoid with a gradually changing diameter is included at each end of the solenoid. By adjusting different parameters of the auxiliary solenoid, we mitigate the edge effect of the solenoid and enhance its overall magnetic field uniformity. The optimization of the auxiliary solenoids is achieved through artificial neural network techniques. Finite element simulation results with the optimized parameters show that the proportion of uniform areas can be improved by more than 5 times. The research results provide a reference for high-precision electromagnetic sensing applications based on solenoids.

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“…High-temperature superconductors (HTSs) have excellent current carrying capacity with extremely low loss, and thus have high potential to be used in power grids and other highperformance power devices, such as motors for aircraft or transformers for high-speed trains [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Critical current and loss character of quasi-isotropic strands with resistance

Li¹

2022

Supercond. Sci. Technol.

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The quasi-isotropic strand has a central rotational symmetry structure which shows well isotropic performance on the magnetization loss when the strand is subjected to the external applied alternating magnetic field with various directions. This paper study on the critical current and ac loss character of the quasi-isotropic strand with the consideration of the resistance between tapes based on the minimum electromagnetic entropy production (MEMEP) method. The quasi-isotropic strand show resistance dependence on critical current, transport loss, and magnetization loss. The resistances between tapes could increase the critical current without significant increases in the total loss. High-frequency excitation conditions would not increase the loss per cycle, either. The results indicate that the quasi-isotropic strand is very suitable for power cables or other high power applications.

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Application of Flux Diverters in High Temperature Superconducting Transformer Windings for AC Loss Reduction

Cited by 7 publications

References 22 publications

Design, development, and testing of a 6.6 MVA HTS traction transformer for high-speed train applications

Design, development, and testing of a 6.6 MVA HTS traction transformer for high-speed train applications

Design and optimization of a novel solenoid with high magnetic uniformity

Critical current and loss character of quasi-isotropic strands with resistance

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