In recent years, the power generation market demands the simple generator systems from the viewpoint of better operability and maintainability, and lower initial cost. In order to meet such customer's requirements, the authors have developed indirect hydrogen-cooled turbo-generators up to the 700 MVA class for both combined-cycle and coal-fired thermal power plants. Development of these generators was achieved mainly by high thermal conducting insulation for the stator coil and optimization of the hydrogen gas flow distribution. This has enabled the indirect hydrogen-cooling system to be applied to generators with capacities where water-cooled stator coil had been applied. An indirect hydrogen-cooled 50Hz-710 MVA turbo-generator has thus been completed and has shown the excellent performance and high quality in the shop tests. This paper describes the main technologies and shop test results.
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