Experimental investigation of the loss characteristics of superconductors for AC power applications

Abstract

Recent studies1I2 confirm the economical feasibility of the .application of superconductors in AC power apparatus. The low-loss conductor which has been proposed still only exists in theory. Simple calculations show that the economic criterion described by Ogasawara3 and Hldsnik' is inaccurate because of an oversimplified hysteresis loss formula. A necessary modification shows that stricter demands will have to be made. As production of ultrafine filaments is abig technological problem, final diameter reduction by rolling instead of drawing is proposed. The expected better performance of a rolled composite has been verified experimentally in test coils as well as in transform&-geometry. Experimental setup and results are presented.

Design and operation of a protection system for transformers with superconducting windings

“…In the arrangement of Figure lc this results in a resistance R in series with the main coil. Recalculating Equations (7) - (9) including R, and applying the simplification of Equation (I 1), we then lind thal…”