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Efficiency calculations for a superconducting transformer – an experimental investigation.

Number: 101

Author(s) : ORCHUK S., CHANDRA S.

Summary

The efficiency of a single-phase, 15 kW electric transformer using conventional copper secondary windings was captured experimentally.  The secondary winding was then replaced by a high temperature superconductor and the efficiency measured for comparison.  While superconductors offer near-zero resistance to alternating current, they require cryogenic temperatures, and boil-off of the cryogenic coolant must be reconciled in practical efficiency calculations.  The present research quantifies the efficiency gain of a superconducting secondary winding in a high-current transformer and provides the relative contributions of cryogen boil-off.  It was observed that thermal conduction through the copper leads joining the superconductor to the load provide the largest source of cryogen loss.  A carbon rod is deployed to replace this joint, as it offers high electrical conductivity with lower thermal conductivity than copper.  This novel material choice provides the conditions for practical deployment of high temperature superconductors using saturated nitrogen as a working fluid.

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Pages: 7 p.

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Details

  • Original title: Efficiency calculations for a superconducting transformer – an experimental investigation.
  • Record ID : 30031041
  • Languages: English
  • Source: Proceedings of the 17th IIR International Conference on Cryogenics, Dresden, Germany, april 25-28 2023
  • Publication date: 2023/04/25
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2023.0101

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