Performance evaluation of squirrel-cage damper structure for superconducting generators

Abstract

SUMMARYSuperconducting generators have many advantages such as increasing generation efficiency and improving power system stability. In Japan, 70-MW-class superconducting generators have been developed through the national project "Electric Power Application of Superconducting Technologies (1988Technologies ( -1999." In this paper, performance evaluation of the rotor damper structure for the 70-MW-class model generator is discussed. Doublelayered damper structure, which consists of a squirrel-cage warm damper and a single-layered cold damper, was set as the target. As the first step, basic electromagnetic and thermal performances were obtained. Consequently, it was proven that the damper structure had the performances to satisfy the requirements of the superconducting generators. Performances obtained from the experimental model, design of the 70-MW model rotor, and evaluation by the verification tests are described in this paper.