Critical current and AC loss measurements of superconductors developed for the Super-GM project under cyclic mechanically loaded condition

Abstract

The design philosophy of the test facility constructed at the Central Research Institute of Electric Power Industry (CRIEPI) is described, and the test results of critical currents and AC losses of superconductors for a 200-MW-class generator rotor winding developed in the Super-GM project under a cyclic mechanically loaded condition are given. The facility can provide a sample current up to 15 kA, a DC magnetic field up to 7 T, 3 Hz of AC magnetic field up to +or-0.9 T, and a compressive mechanical force up to 100 kN to simulate the centrifugal force of the generator rotor winding. The authors evaluated the performance of three types of NbTi superconductors under 10000 applications of cyclic load. >