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目前，日本已建造了许多座担负调整电网峰荷任务的抽水蓄能电站．为了提高抽水蓄能电站的经济性，水泵水轮机正在向高扬程、大容量化方向发展，发电电动机也随之迈向大容量化与高速化．尽管抽水蓄能电站占电网总体容量的比例不高，但是单机容量在不断增加，在这种情况下，万一出现停机，对系统的冲击将非常大，故要求机组具有高度的可靠性． 1999年12月投运的葛野川电站1号发电电动机，额定规格为475 MVA－500 r／min，这大大地超越了正在运行的400 MVA－400 r／min级机组，在规格上已接近空冷发电电动机的制造极限．文中介绍了日立公司对大容量抽水蓄能机组的开发情况及葛野川发电电动机的特性．
At present, Japan has built a number of pumped storage power stations that are responsible for adjusting the peak load of the power grid. In order to improve the economy of pumped storage power plants, pump turbines are moving toward high-lift and high-capacity development. As a result, power-generating motors are also becoming more and more large-capacity and high-speed. Although the ratio of pumped storage power stations to the total grid capacity is not high, the stand-alone capacity is continuously increasing. In this case, if there is a shutdown, the impact on the system will be very large, so the unit is required to have a high degree of reliability. The Geyechuan Power Station No. 1 generator, put into operation in December 1999, has a nominal specification of 475 MVA-500 r / min, which goes well beyond the running 400 MVA-400 r / min unit and is close to air-cooled Generating motor manufacturing limit. This paper introduces Hitachi’s development of large-capacity pumped storage units and the characteristics of Gene’s Electric Generator.