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Abstract
This paper describes the experimental studies on several coils wound with multifilamentary (MF) Nb <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> Sn cables with reinforcing strip for superconducting rotating machine application. To apply Nb <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> Sn superconductor to field winding of a rotating machine, we investigated several coil performances of pre-reacted, bronze processed and stranded MF Nb <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> sn cables mainly in relation to stress effect. Bending strain up to 0.64% in strand and winding stress of 5 Kg/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> have resulted non-degradation in coil performance. A pair of impregnated race-track coils designed for application to a 30 MVA synchronous condenser was energized successfully up to 80% of critical current without quench. The test results have demonstrated that the cable type Nb <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> Sn conductors provide adequate flexibility and tensile strength to meet our requirement for use in a rotating machine.
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