A 12.5 kVA, MgB2
superconductor transformer was designed as five alternating stacked coils between the primary and
the secondary windings. Hyper Tech Research Inc. (Hyper Tech) manufactured multifilament
MgB2
superconductor wire by using a patented process called the
continuous tube filling and forming (CTFF) process. The CTFF
MgB2
conductor was insulated with yttrium-stabilized zirconia (YSZ) using the chemical solution
coating process. An all-copper former was designed and fabricated with an OD of 71 mm,
ID of 42 mm and heights of 12 mm and 8 mm for primary and secondary coils, respectively.
Two primary and three secondary coils were fabricated using the sol–gel insulated
MgB2
wire using the W&R coil technology. One of the primary coils was tested at 4.2 K which
showed better than 250 A engineering critical current. These five coils were then stacked as
in the design in alternating fashion and connected and instrumented for testing. The
transformer was cooled in He gas first then in liquid helium. The tests showed that the
individual coils, the primary and the secondary windings performed better than the design
currents. Also the open-circuit tests of the transformer showed that 1:1 transfer was
achieved.This article was originally submitted for the special issue ‘Selected papers from
the International Conference on Superconductivity and Magnetism (ICSM2008) (Side,
Turkey, 25–29 August 2008)’, Superconductor Science and Technology, volume 22, issue 3.
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