一些大型水电站由于施工工期长,都期望首批机组在极低水头条件下就能提前投入运行,以便开始回收投资。基于这一目的,水头变化范围大的水电站在选择水轮发电机类型时,必须就其成本、能量损失(效率系数)以及电站厂房施工部分的成本差额等方面进行技术经济比较。 Due to the long construction period of some large-scale hydropower stations, it is expected that the first batch of units will be put into operation ahead of schedule under very low head conditions in order to start the recovery of investment. For this purpose, hydropower stations with a wide range of head changes must make technical and economic comparisons in terms of their cost, energy loss (efficiency factor), and the cost difference in the construction of the power station plant when selecting the type of hydroelectric generator.