Fault current tests of a 5-m HTS cable

Lue, J.W.; Barber, G. C.; Demko, J. A.; Gouge, M.J.; Stovall, J.P.; Hughey, R.L.; Sinha, Uday Kumar

doi:10.1109/77.920132

Cited by 24 publications

(3 citation statements)

References 4 publications

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“…There is widespread experience with signals containing a false component that, in spite of being in phase with the cable current, does not have anything to do with the true loss. Sometimes it is preferred to utilize the voltage drop as measured between the current terminations, containing the loss signal from superconductor on a large resistive background [5][6][7][8]. In this case, the results are obtained after subtracting the loss in current termination from the total measured loss.…”

Section: Introductionmentioning

confidence: 99%

Non-uniform current distribution as the cause of false voltage signals in the ac loss measurement on a superconducting cable

Gömöry

Frolek

Šouc

2005

Supercond. Sci. Technol.

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Electrical measurement of ac loss in a short model of superconducting cable plays an important role in the development of low-loss cables. The main problem in this type of measurement is the appearance of false loss voltage signals. For the experiments when the total current splits into parallel paths, inevitably with different impedances, a voltage component in phase with the cable current is induced in signal wires. The source of this voltage originates in the phase differences between the total current in the cable and the currents flowing through individual tapes. A simple equivalent circuit model has been developed that allows us to estimate these phase shifts. Analytical formulae have also been derived for the false voltage signals. According to these formulae reliable data can be achieved by taking the sum of voltage signals read by signal wires symmetrically surrounding the cable. While not contributing to the ac loss measurement, the false voltage signals can be used to detect the phase shifts in tape currents referred to the phase of the total cable current. Theoretical predictions have been experimentally verified with the help of a 1 m cable model manufactured to allow for the theoretical model to be evaluated. Experiments demonstrated that the variation in contact resistances is the most critical factor in the testing of short cable models.

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Section: Introductionmentioning

confidence: 99%

Non-uniform current distribution as the cause of false voltage signals in the ac loss measurement on a superconducting cable

Gömöry

Frolek

Šouc

2005

Supercond. Sci. Technol.

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“…Previous tests on a different 5-m cable using a nonalloyed silver BSSCO-2223 tape without a splice showed that for an overcurrent of 10 kA the cable resistance went to 0.16 mΩ and did not increase much during the pulse. 9 The alloy sheath of the HTS tapes in the splice cable has higher resistance and produces more heat in overcurrents.…”

Section: The DC V-i Curves and Overcurrent Testsmentioning

confidence: 99%

ORNL Superconducting Technology Program for Electric Power Systems--Annual Report for FY 2001

Hawsey¹

2002

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Two major new laboratories were renovated and equipped as part of the Accelerated Coated Conductor Initiative (ACCI). One laboratory houses conductor-processing facilities, and the other houses conductor-characterization facilities. Office space for two industrial partners and three postdoctoral fellows has been included in the laboratory design. To support the ACCI research activities at ORNL, two new staff members and three new postdoctoral fellows have been hired. Over $1M in new equipment was purchased for these laboratories. Industry has been involved through secure web-based exchange of long-length texture data, joint experiments, and equipment specifications. On-site industry assignments are anticipated in FY 2002. PROGRAMMATIC Three new documents were completed and posted on the ORNL HTS web site, http://www.ornl.gov/ HTSC/htsc.html. The Cryogenics Roadmap and the Cryogenic Implementation Plan were assembled and posted. In addition, an extensively revised and updated version of An Analysis of Future Prices and Markets for High Temperature Superconductors (the Mulholland Report) was completed. The report contains a detailed identification of the analysis pathways in the original Mulholland spreadsheet, identification of assumptions, examination of the specific device models, extension of the analysis period to 2025, and recalculations to reflect these changes.

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“…They have found out that the level of the tape degradation is not dependent on the initial value of the critical current, but on the peak value of the reached temperature. Overcurrent testing of superconducting tapes and cables was mainly performed by means of a constant current source for investigating the magnet or cable stability [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Impact of a REBCO coated conductor stabilization layer on the fault current limiting functionality

Búran

Vojenčiak

Mosat

et al. 2019

Supercond. Sci. Technol.

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Reliability is one of the crucial requirements of conductors used in resistive superconducting fault current limiters. Possible critical current degradation of a REBCO coated conductor during the limiter operation restrains broader application of devices based on these conductors. In this article the impact of an electrical stabilization layer on the conductor protection against overheating as well as its effect on electrical current evolution during the limitation period are investigated. For the experimental part of the study, a commercial copper stabilized REBCO coated conductor and a modified conductor without copper stabilization are compared. Extensive experimental work complemented by electro-thermal numerical modeling paved the way for studying the electrical and thermal effects separately. The numerical model assuming adiabatic conditions is sufficient to reproduce experimental results and predict the peak temperature for conductors with various stabilization layers in realistic conditions. Reduction of the conductor critical current caused by multiple current limitation pulses was studied using pulses with various durations. It was observed that the degradation due to temperature rise is gradual with the rate depending solely on the peak temperature. It is this quantity through which other parameters like the pulse duration, the thickness of stabilization and the peak current cause the tape damaging.

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Fault current tests of a 5-m HTS cable

Cited by 24 publications

References 4 publications

Non-uniform current distribution as the cause of false voltage signals in the ac loss measurement on a superconducting cable

Non-uniform current distribution as the cause of false voltage signals in the ac loss measurement on a superconducting cable

ORNL Superconducting Technology Program for Electric Power Systems--Annual Report for FY 2001

Impact of a REBCO coated conductor stabilization layer on the fault current limiting functionality

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