我国水力资源丰富，潜力巨大，水能储量大约3．8亿kw，到目前为此，仅开发了总水能的10％左右。今后，将在长江、黄河、金沙江和澜沧江等河流上建设大型水电站，需要研制巨型的水电机组。目前，空冷低速机组己处于制造的极限边缘，有的中、高速机组采用空冷已很难满足要求。因 China is rich in hydropower resources and has great potential. Its hydro-energy reserves are about 380 million kw. So far, only about 10% of the total hydropower has been developed. In the future, large hydropower stations will be built on rivers such as the Yangtze River, the Yellow River, the Jinsha River and the Lancang River, and huge hydropower units will need to be developed. At present, air-cooled low-speed unit has been in the manufacture of the edge of the limit, and some medium-high-speed units with air-cooled has been difficult to meet the requirements. because