Development and Test Results of HTS Windings for Superconducting Transformer With 1 MVA Rated Power

• Published in: IEEE transactions on applied superconductivity Vol. 27; no. 4; pp. 1 - 5
• Main Authors: Vysotsky, V. S., Fetisov, S. S., Zubko, V. V., Zanegin, S. Yu, Nosov, A. A., Ryabov, S. M., Bykovsky, N. V., Svalov, G. G., Volkov, E. P., Fleishman, L. S., Dzhafarov, E. A.
• Format: Journal Article
• Language: English
• Published: IEEE 01.06.2017
• Subjects: ac loss; Current distribution; High-temperature superconductors; Magnetic field measurement; Magnetic fields; parallel side-by–side windings; Power transformers; superconducting transformer; Windings
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2016.2639011

We developed a method to combine parallel superconducting HTS tapes to a current carrying element with high current and uniform current distribution among strands at ac mode. The current carrying elements are made of several parallel HTS tapes placed side-by-side on a round mandrel. The test of the small model made of five parallel 2G HTS tapes confirmed the idea. The method was implemented for 10/0.4 kV, 1 MVA power transformer. For both low and high voltage windings, we used 12 mm Amperium tapes from American Superconductor Co. For low-voltage winding 19 parallel tapes were wound on four mandrels and connected in series. High-voltage winding was wound with a single 12 mm tape. The assembled windings of each phase were tested at liquid nitrogen temperature without iron yoke. AC losses were measured in low-voltage winding at two modes: when high voltage winding was either shortened or open. In this paper, we present the details of current carrying element development and test, 1 MVA transformers winding designs and test results.