Kazuichi Suzuki

Recent progress on 70 MW class superconducting generators

Super-GM has been continuously developing 70 MW class superconducting model generators to verify the basic technologies required for the design and manufacture of a 200 MW class superconducting pilot generator. Three types of 70 MW class superconducting model generators, two slow response excitation type and a quick response excitation type, have been developed on the project. A test run for one of the slow response excitation type generators was completed successfully in December 1997. The other slow response excitation type generator is undergoing a verification test at the Super-GM Testing Center. On the other hand, factory test of the quick response excitation type rotor is finished. This paper describes the progress of the Super-GM activities together with the latest test results.

Normal propagation velocity and quench energy of the rotor model for a 70 MW class superconducting generator

A rotor model was fabricated to estimate the performance of the 70 MW class superconducting generator. The normal propagation velocity and quench energy for the rotor model in the rotational field are measured at various rotating speeds. An analytical model is proposed in order to explain the experimental data. In the calculation, the heat transfer and the temperature rise of liquid helium in the rotational field are considered. The calculated results are compared with the experimental data, and these agree well. Therefore it becomes possible to precisely design field windings of superconducting generator.

Cryogenic and electrical performance at a factory test of a rotor for 70 MW class slow-response excitation type superconducting generator

70 MW class superconducting generators are under development as a national project in Japan. This is an eleven-year program which commenced in 1988. The manufacturing of the slow response excitation type rotor was completed at the beginning of 1996, and performance test of the rotor was carried out in the factory at the beginning of 1997. The factory test has been completed successfully. This paper describes the factory test results of the cryogenic performance and the electrical performance.