DC and AC transport current measurements up to 140 A in melt-grown YBCO superconductors

Yang, Y.; Ashworth, S.P.; Beduz, C.; Scurlock, R.G.; Webb, Richard A.; Yi, Z.

doi:10.1088/0953-2048/3/6/002

Cited by 13 publications

(4 citation statements)

References 6 publications

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“…The experimental results are in accordance with above analysis. In this paper, f 0 = 180 Hz, so if the YBCO-coated conductor operates at frequency of 50 Hz or 60 Hz, according to (5), the novel criterion is 3-3.6 μV/cm. Generally, most of power applications of high-temperature superconductors operate at low frequency.…”

Section: B Frequency Dependence Of I-v Characteristics Under Self-fieldmentioning

confidence: 99%

“…Therefore, the conventional criterion of E c = 10 −4 Vm −1 is no longer applicable. It was experimentally verified that the AC current capacity of YBCO-coated conductors was larger than DC critical current at 50 Hz, liquid nitrogen and 5 T [5]. Another approach was also put forward by obtaining the inflection point of logV − logI to define AC current capacity.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling and Experimental Analysis of AC Critical Current in YBCO-Coated Conductors

Liu

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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Critical current is generally defined by the dc measurement at which current produces voltage of E c = 10 −4 Vm −1 . However, most applications of superconductor are operating at alternating current (ac). Moreover, the ac current-carrying capability of superconductor has attracted extensive attention. This paper is aimed to define the transport ac critical current and put forward a novel electric field criterion based on numerical modeling and experimental analysis. YBCO-coated conductor is investigated because of its power application potential and good anisotropy compared to Bi2223/Ag high-temperature superconductor. On measurement of I-V curves of YBCO-coated conductors at different frequency and liquid nitrogen temperature of 77 K, a novel criterion of transport ac critical current was proposed. Numerical modeling of finite element method was carried out, which was coincident with the experimental results.Index Terms-Alternate current capacity, frequency dependence, I-V curves, YBCO. 1051-8223

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Section: B Frequency Dependence Of I-v Characteristics Under Self-fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Modeling and Experimental Analysis of AC Critical Current in YBCO-Coated Conductors

Liu

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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“…The best results are obtained in the MPMG samples with Ag doping and the repulsive force reaches 55N at a 1 mm gap,indicating that an object weighing 5.5 kg can be levitated at this height. Ag doping was effective in Z 40 - 10 20 Distance (mm)…”

Section: Journal Of Engineering Materials and Technologymentioning

confidence: 99%

“…Up to now, a variety of melt processes [6][7][8][9][10][11][12][13][14][15] have been reported to yield high J c values in YBaCuO.…”

Section: Introductionmentioning

confidence: 99%

Melt Processing of Bulk YBaCuO Superconductors With High Jc

Murakami

Kondoh

Fujimoto

et al. 1992

Journal of Engineering Materials and Technology

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There are several melt processes which promote high J c in bulk YBaCuO. A comparison of various melt processes was performed in this study. It was found that size control of the Y 2 BaCuO s inclusions is the key to the improvement in J c values. IntroductionOxide superconductors are very attractive since they have high critical temperatures, which enables the use of liquid nitrogen as a coolant. However, for most applications of superconductors, critical current densities (J c 's) of 10 4 -10 6 A/cm 2 are required in the presence of significant magnetic fields. It was once believed that the J c values of oxide superconductors were intrinsically small and their applications were extremely limited [1].There are three major problems in oxide superconductors for obtaining high J c at high temperatures: (1) weak links; (2) low flux pinning force; and (3) thermal activation. As long as the superconductors are used at high temperatures, thermal

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