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Energy Stored In A Coaxial Cable

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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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Published on: December 22, 2018

A superconducting transformer system for high current cable testing.

A Godeke1, D R Dietderich, J M Joseph

  • 1Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA. agodeke@lbl.gov

The Review of Scientific Instruments
|April 8, 2010
PubMed
Summary
This summary is machine-generated.

A new direct-current superconducting transformer system enables high-current testing of superconducting cables. This system offers precise current control and measurement, improving the efficiency and safety of critical current assessments.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Applied Physics

Background:

  • Superconducting cables require high-current testing to determine critical current performance.
  • Existing testing methods can be complex, time-consuming, and pose safety challenges.

Purpose of the Study:

  • To develop a direct-current (dc) superconducting transformer system for efficient and safe high-current testing of superconducting cables.
  • To achieve precise control and measurement of secondary currents up to 50 kA.

Main Methods:

  • A core-free superconducting transformer with a 10,464-turn primary and 6.5-turn secondary solenoid was designed.
  • Inductive measurement of secondary current using toroidal-wound Rogowski coils with digital integration.
  • A feedback loop was implemented to automatically compensate for resistive losses.

Main Results:

  • The system was commissioned up to 28 kA secondary current.
  • Reproducibility in secondary current measurement exceeded 0.05% for currents up to 25 kA.
  • Secondary current drift was estimated below 0.5 A/min.

Conclusions:

  • The developed superconducting transformer system provides fast, high-resolution, economic, and safe testing of superconducting cable critical currents.
  • The system's performance was validated through voltage-current measurements under a high magnetic field.