| China is a country which is in possession of the most abundant waterpower resources and its gross reserves is 6.76 hundred million kilowatt. Waterpower resources intallation capacity is 3.78 hundred million kilowatt in accordance with the water conservancy layout in 1970s. According to The-Ninth-Five-Year-Programming and the plan of the year 2010, the project to Transmit Electricity From the West to the East is promptly carrying on. Some of the large-size power stations located in the west are under implement and plan which unit capacity is more than 500 MW. The lectotyping and designing and manufacturing for large-size hydro-generating units of these power stations is directly related to the reliability, fitness and convenience for operation and maintenance. In this paper, regarding the large-size hydro-generator of Xiaowan power station, with FEM method the author calculates and analyzes the result of ventilation, cooling and temperature rise of air-cooling scheme, as well as rigidity, strength and stability of large components and thrust bearing. Meamwhile, the author also demonstrate the feasible electromagnetic and structural scheme of air-cooling of stator and rotor and compares the cooling type with that applied in Three Gorges and Long Tan units. The result proves it's feasible for the scheme of stator and rotor air-cooling for large hydro generator of Xiaowan which unit capacity is 700MW. It meets the need of long-term service for unit with safety and stabilization completely.
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