Superconducting Transformer for Superconducting Cable Testing up to 45 kA

Yu, Haizhou; Lü, Jun

doi:10.1109/tasc.2020.2972502

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…This power supply also provides the detection and protection against an SCT or sample quench. For maximum stored magnetic energy of 45 kJ, no additional quench protection is needed as confirmed by our previous tests [6]. The data acquisition system includes National Instruments SCXI-1000.…”

Section: The Sct and Its Controlmentioning

confidence: 92%

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Calibration of a superconducting transformer by measuring critical current of a NbTi Rutherford cable

Yu¹,

Levitan²,

Lü³

2021

Supercond. Sci. Technol.

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Large high field superconducting magnets often require high current superconducting cables. To develop these cables, a facility capable of providing a high magnetic field with large sampling area as well as electrical current of tens of kA is essential. A superconducting transformer (SCT) is an energy-efficient and low-cost way to provide large current to superconducting cables. Previously, we co-developed an SCT and successfully tested it to a maximum output current of 45 kA in zero magnetic field. In this work, this SCT is installed to the 12 T split solenoid magnet at the National High Magnetic Field Laboratory (NHMFL). We calibrated it by using this facility to measure the critical current of an NbTi Rutherford cable as a function of magnetic field up to 10 T, and compared the results with those available in the literature. In addition, a strand extracted from the NbTi cable was tested for critical current. The critical current of the extracted strand is scaled and compared with the critical current of the cable. The accuracy of the critical current measurement using this SCT is discussed in detail. This work concludes the commissioning of this SCT, which combined with the 12 T split magnet will provide a unique cable testing capability for future cable development for the NHMFL and its users.

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Section: The Sct and Its Controlmentioning

confidence: 92%

“…The SCT was designed and constructed initially at the LBNL [5]. To commission the SCT as an NHMFL user facility for superconducting cables research for future large superconducting magnets, we designed a new electronic control system for this SCT and tested it in zero magnetic field up to 45 kA [6].…”

Section: Introductionmentioning

confidence: 99%

Calibration of a superconducting transformer by measuring critical current of a NbTi Rutherford cable

Yu¹,

Levitan²,

Lü³

2021

Supercond. Sci. Technol.

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“…where L is the inductance of the circuit, which is the sum of SCT secondary inductance of 2.53 µH [8] and the sample inductance of 0.98 µH which is obtained from the measured inductive voltages during current ramps. With the measure τ = 520 s, the joint resistance is calculated to be 6.8 ± 0.4 nΩ, in reasonable agreement with that from the V4-I slopes.…”

Section: A the Simple-stacked Cablementioning

confidence: 99%

“…For the development of HTS cables, a facility for measuring high critical current (Ic) in high magnetic field is critically important. The National High Magnetic Field Laboratory (NHMFL) has a facility with a 12 T split solenoid magnet and a recently developed superconducting transformer (SCT) that provide current up to 45 kA [8], [9]. In this paper, critical currents of a simple-stacked REBCO cable and a Conductor-on-Round-Core (CORC ® ) cable were measured at 4.2 K in magnetic field up to 12 T. The experimental details and results will be presented and discussed.…”

Section: Introductionmentioning

confidence: 99%

Critical Current Measurement of REBCO Cables by Using a Superconducting Transformer

Lü

Weiss

et al. 2022

IEEE Trans. Appl. Supercond.

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Development of REBCO cables that carry high electrical current in high magnetic field is crucial for future large-scale magnet applications. This experimental work presents the critical current measurements of two different REBCO cables by a test facility at the National High Magnetic Field Laboratory (NHMFL). The simple-stacked cable is made by the NHMFL by stacking 21 REBCO tapes without soldering. The Conductor-on-Round-Core (CORC ® ) cable provided by Advanced Conductor Technologies has 21 layers of REBCO tapes with 2 tapes/layer. The test facility consists of a 12 T split solenoid magnet with 15 cm bore providing transverse field to the samples, a superconducting transformer (SCT) as a current source providing up to 45 kA current. Special attentions were paid to fabrication of solder joints between REBCO cables and the SCT output. The voltage-current traces were measured as a function of magnetic field at 4.2 K, from which the critical currents are determined. The details of this measurement are discussed.

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Integration of renewable energy source in transmission grids: issues and perspectives

Somma¹,

Falvo

Graditi³

et al. 2021

2021 IEEE International Conference on Environment and Electrical Engineering and 2021 IEEE Industrial and Commercial Power Syst

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Superconducting Transformer for Superconducting Cable Testing up to 45 kA

Cited by 5 publications

References 8 publications

Calibration of a superconducting transformer by measuring critical current of a NbTi Rutherford cable

Calibration of a superconducting transformer by measuring critical current of a NbTi Rutherford cable

Critical Current Measurement of REBCO Cables by Using a Superconducting Transformer

Integration of renewable energy source in transmission grids: issues and perspectives

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