Estimation of the AC Loss of a YBCO Coated Conductor With Metal Substrate by Using Numerical Calculation

Lee, Hyang-Beom; Lee, Ji-Kwang; Lim, H.W.; Lee, Kwangyeon; Cha, Gueesoo; Park, Chan

doi:10.1109/tasc.2005.849169

Cited by 5 publications

(3 citation statements)

References 3 publications

(4 reference statements)

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“…A number of estimates of the magnetic hysteresis loss contribution to overall transport loss in an isolated tape have been made [2][3][4][5][10][11][12]. Many of these used the simplifying assumption that the induction B = μI /2w, where w is the width of the tape.…”

Section: Effect Of Substrate Magnetism On Ac Lossesmentioning

confidence: 99%

Magnetic properties of Ni-based substrates for HTS tape

Claassen

Thieme

2008

Supercond. Sci. Technol.

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Ni–W alloys are used as the substrate in the manufacture of HTS tape via the RABiTSTM process. Theoretical work has shown that the ferromagnetism in a substrate can affect the ac losses in the superconductor. This occurs in part because of the increased magnetic permeability, which alters the magnetic induction in the superconductor and thereby the loss. Magnetic hysteretic loss in the substrate is an additional contribution to overall ac loss. We report measurements of both permeability and magnetic loss as a function of frequency and magnetic induction for the standard alloy Ni–5W as well as composite substrates incorporating non-magnetic Ni–W alloys. The measurements are done using ac susceptibility at 77 K, at frequencies up to 104 Hz and inductions in the range 1–150 mT. It is shown how to use these results to predict total ac loss in isolated superconducting tape and wound coils. Some important magnetic parameters cannot be obtained with sufficient accuracy using a SQUID or vibrating sample magnetometer, since the size of a sample is limited in these measurements. This makes the demagnetizing factor large enough to degrade the accuracy of a permeability measurement.

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Section: Effect Of Substrate Magnetism On Ac Lossesmentioning

confidence: 99%

Magnetic properties of Ni-based substrates for HTS tape

Claassen

Thieme

2008

Supercond. Sci. Technol.

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“…Calculations of magnetization loss in a tape [6,7] show a reduction when a magnetic substrate is present. Such a reduction in loss was recently observed [8] for YBCO tapes on NiW substrates.…”

Section: Related Workmentioning

confidence: 99%

Effect of substrate magnetism on the ac loss of high temperature superconductor tape-wound coils

Claassen

2006

Supercond. Sci. Technol.

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Magnetism can affect losses in superconducting coils in two ways. First, there is magnetic loss (‘core loss’). This can be separately measured as a function of magnetic induction in the material of interest (usually the substrate on which a superconducting film is grown). One can then find the fields in the coil when a current is applied and calculate the magnetic loss. A second mechanism, which has not been previously addressed, is an enhancement in the ac losses in the superconductor itself due to increases in the local magnetic fields. This contribution depends on the permeability of the magnetic material. Both contributions are calculated for a specific coil geometry using magnetic properties of a NiW alloy. In this example it is found that the latter contribution can be significantly larger than the former.

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“…Effects of copper layers and substrate were not considered in this calculation because those values could be neglected [7], [8].…”

Section: B Numerical Calculation Of Ac Lossmentioning

confidence: 99%

AC Losses of Pancake Winding and Solenoidal Winding Made of YBCO Wire for Superconducting Transformers

Lim

Cha

Lee

et al. 2007

IEEE Trans. Appl. Supercond.

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Pancake winding and solenoid winding are commonly used ones in superconducting power transformers. This paper deals with AC losses of the pancake winding and solenoidal winding made of YBCO wire. The pancake winding and the solenoidal winding which had same number of turns and diameter had been made and tested. Inner diameter and number of turns of both windings were 100 mm and 30, respectively. Pancake winding and solenoidal winding which were made of BSCCO wire were also fabricated and measured. Results of measurements were compared with the AC losses obtained by numerical calculation.

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Estimation of the AC Loss of a YBCO Coated Conductor With Metal Substrate by Using Numerical Calculation

Cited by 5 publications

References 3 publications

Magnetic properties of Ni-based substrates for HTS tape

Magnetic properties of Ni-based substrates for HTS tape

Effect of substrate magnetism on the ac loss of high temperature superconductor tape-wound coils

AC Losses of Pancake Winding and Solenoidal Winding Made of YBCO Wire for Superconducting Transformers

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