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We are now developing a 70MW class superconducting generator with low response excitation (hereafter we call it simply 70MW class machine). The field windings for the 70MW class machine require high current density to achieve low reactance and low a. c. losses to resist the magnetic flux variation at the power system fault. To develop such field windings with high current density and low a. c. losses, it is important to select proper superconducting cables and to find appropriate cable supporting and cooling system. Therefor we constructed model coils of the field windings for the 70MW class machine and investigated these performance. This paper describes at first the configuration of the model coils and then the test apparatus and the test method for these model coils. This paper also describes the test results and the applicability of these test results to the field windings for the 70MW class machine. We have found the superconducting cable and the cable supporting and cooling system which are applicable to the field windings for the 70MW class machine.

An Experimental Study concerning Field Windings for 70MW Class Superconducting Generator with Low Response Excitation.