With the background of electric power demand growth and effective resource utilization, demand
for larger-capacity turbine generators has been increasing. Mitsubishi Hitachi Power Systems, Ltd.
(MHPS) has developed a 1300 MVA-class turbine generator with a direct water cooled stator
system that has 1.2 times as much capacity as the preceding generator. The developed turbine
generator adopts various technologies that increase capacity, and has left the factory after gaining
favorable results in factory tests for the evaluation of the performance and reliability of the applied
technologies. As a result of enhanced cooling performance through the development of a high heat
transmission insulation system, the basic design of a large-capacity generator with indirect
hydrogen cooling instead of the conventional direct stator water cooling has been completed, and
it is estimated that the capacity of the designed generator can be increased to 900 MVA class for
both 50 Hz an 60 Hz.
