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Uncertainty Evaluation for DC Critical Current Determined by Using Power-Law Fit to Current–Voltage Curve Applicable to Superconducting Wires and Power Cables

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Abstract

We evaluate the uncertainty associated with the critical current measurement of high-temperature superconducting power cables in which a power-law fit of a voltage–current characteristic is used to determine the critical current. We calculate the uncertainty contribution of each factors involved in the critical current measurement and find that the largest contribution to the combined standard uncertainty comes from the process of the power-law fit. This analysis can be applied to the uncertainty evaluation on the critical current measurement of superconducting wires.

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References

  1. IEC 61788-1 Ed. 2: Superconductivity, Part 1: Critical current measurement—DC critical current of Nb-Ti composite superconductors. International Electrotechnical Commission (2005)

  2. IEC 61788-2 Ed. 2: Superconductivity, Part 2: Critical current measurement—DC critical current of Nb3Sn composite superconductors. International Electrotechnical Commission (2005)

  3. IEC 61788-3 Ed. 2: Superconductivity, Part 3: Critical current measurement—DC critical current of Ag- and/or Ag alloy-sheathed Bi-2212 and Bi-2223 oxide superconductors. International Electrotechnical Commission (2006)

  4. KS C 6111-6: Measurement method for the DC critical current of superconducting power cables. Korea Standards Information Center. www.standard.go.kr (2009)

  5. International Organization for Standardization: Guide to the expression of uncertainty measurement, Switzerland (1993)

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Authors and Affiliations

  1. Department of Physics, Yeungnam University, 214-1 Dae-dong, Gyeongsan, 712-749, South Korea

    Dong Ho Kim

  2. Superconducting Devices & Cryogenics Group, Korea Electrotechnology Research Institute, Changwon, South Korea

    J. Cho & K. Shim

  3. Department of Electrical Engineering, Uiduk University, Gyeongju, South Korea

    S. J. Lee & S. J. Choi

  4. Korea Research Institute of Science and Standards, Daejon, South Korea

    K. W. Lee

Authors
  1. Dong Ho Kim
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  2. J. Cho
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  3. K. Shim
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  4. S. J. Lee
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  5. S. J. Choi
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  6. K. W. Lee
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Correspondence to Dong Ho Kim.

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Kim, D.H., Cho, J., Shim, K. et al. Uncertainty Evaluation for DC Critical Current Determined by Using Power-Law Fit to Current–Voltage Curve Applicable to Superconducting Wires and Power Cables. J Supercond Nov Magn 24, 969–974 (2011). https://doi.org/10.1007/s10948-010-0862-1

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  • DOI: https://doi.org/10.1007/s10948-010-0862-1

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