降低电力系统能源损耗,提高经济效益是电力部门历来十分重视的课题,过去做了不少工作,并积累了不少经验,但仍有许多工作要做,潜力很大。现代电力系统投入运行的大、中型水电站日益增加,机组数量很多,各机组的效率特性各不相同,即使是同一型号的机组其效率特性在实际运行中也不可能完全一样。在 Reducing the energy consumption and increasing economic efficiency of the power system has always been a topic of great concern to the power sector. We have done a great deal of work in the past and accumulated a great deal of experience. However, we still have a lot of work to do and great potential. The large-scale and medium-sized hydropower stations with modern power system put into operation are increasing day by day. The number of generating units is large and the efficiency characteristics of each generating unit vary. Even the efficiency characteristics of the same type of generating units can not be exactly the same in actual operation. in