Toward the increase of capacity and the enhancement of the efficiency of indirect hydrogen-cooled turbine generators, Mitsubishi Hitachi Power Systems, Ltd. (MHPS) has developed elementary technologies such as the HHT® high heat transmission insulation system, which increases the heat transmission rate of the stator coil insulation layer by approximately three times compared with existing models. At the same time, MHPS has promoted the standardization and establishment of the product line-up. In the course of development, MHPS introduced multi-objective optimization technology at the basic planning stage to reduce the loss at each component of the generator and reflected it in the standard design toward the realization of high-efficiency generators. A 500 MVA-class generator with multi-objective optimization technology being partially applied was designed and manufactured, and actual machine verification was conducted through running tests at the factory. As a result, it was verified that the 500 MVA-class generator satisfied the specifications and requirements of the standards and achieved a high efficiency of 99.14% with a power factor of 0.8 (lagging). As such, it was confirmed that the applied technology was effective.
