Critical Current Degradation Behavior of Coated Conductor Subjected to Repeat Overcurrent

Chen, Guilun; Ren, Li; Feng, Tangyao; Liang, Siyuan; Li, Jingdong; Tang, Yuejin

doi:10.1109/tasc.2020.2967683

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…Superconducting fault current limiters (SFCL), which have a fast response and can work with circuit breakers, may be an effective means of solving this problem [1][2][3][4][5]. So far, the principle prototype of SFCL, such as resistive type have been successfully developed, and their advantages have been verified by experiments [6][7][8][9][10][11]. In practical engineering applications, the failure mode of existing SFCL is not clear, which leads to doubts about its reliability.…”

Section: Introductionmentioning

confidence: 99%

“…The existing studies mainly focus on the critical current recession and threshold current of ReBCO tapes under different types of overcurrent [12][13][14][15]. Our research team has also previously studied the ultimate withstand capability of ReBCO tapes with different encapsulation materials under various overcurrents and the degradation of the critical current of ReBCO tapes under repeated overcurrent [9,10,16,17]. However, some scholars have conducted studies on the failure mode of ReBCO tapes under mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

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Research on damage characteristics and microscopic appearance of ReBCO tapes after DC overcurrent

Yang

et al. 2023

Phys. Scr.

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With the expansion of the power grid, the use of DC transmission technology is becoming increasingly prevalent. This has led to higher transmission voltage levels, which in turn have brought to the fore the issue of large short-circuit currents. The existing circuit limiter's performance is insufficient to meet the growing demand. Superconducting fault current limiter, which based on ReBCO tapes, is considered to be the solution to the problem of large short-circuit current. However, the failure mode of ReBCO tapes under DC overcurrent remains to be studied. In the superconducting state, the current flows mainly through the superconducting layer. Therefore, it is necessary to investigate the overcurrent characteristics of the superconducting layer after overcurrent. In this work, the damage characteristics and microscopic appearance of ReBCO tapes after overcurrent were investigated. The magnetic field distribution characteristics and the microscopic appearance of the superconducting layers of ReBCO tapes with different degrees of critical current recession were investigated, and the chemical elements of the superconducting layers were analyzed. The results show that large-area pits were found on superconducting layer after overcurrent, the element types and mass proportions did not change. Overcurrent affects the superconductivity of the tape mainly by changing the physical structure of the superconducting layer.

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