DISCUSSION OF THE STABLE THERMAL-EQUILIBRIUM CURRENT OF A SUPERCONDUCTOR DURING TESTS OF HIGH-SPEED ROTOR WINDINGS

Research and development of superconducting generation equipment has b een conducted. As a part of the design research for the superconductin g generator, the stability of superconducting field winding is being s tudied. The goal of this study is to formulate a design philosophy for a stable superconducting field winding in the presence of large distu rbances. In the present paper, we describe the stable thermal equilibr ium current of the superconductor, which is measured during the stabil ity test. Modifying the equal area criterion presented by Maddock et. al., a simple graphical scheme has been presented and the minimum stab le thermal equilibrium current was calculated.