Characteristic Tests and Electromagnetic Analysis of an HTS Partial Core Transformer
An experimental high temperature superconducting (HTS) transformer has been designed and built using GdBCO HTS tapes. The transformer is unique in that the magnetic circuit is comprised of air and an iron partial core. The HTS windings and iron core were immersed in a liquid nitrogen environment. Fundamental characteristics were obtained by no-load and load tests. The transformer had a smaller exciting current compared with the HTS air core transformer, and the voltage regulation was 1.67% at full load. A lumped parameter equivalent circuit that takes the ac loss was proposed and testified by tests. A 3-D “field-circuit” coupled model built in COMSOL was used to successfully analyze the electromagnetic characteristics of the transformer. The experimental results were consistent with the calculated and simulation values. The detail results will describe in this paper.