刘家峡水电厂300MW双水内冷机组的技术改造

刘家峡水电厂５号机组系国产３００ＭＷ双水内冷式水轮发电机组，是我国第１台，也是唯一的３００ＭＷ双水内冷水电机组，于１９７３年投产发电，该机组经过２０年多的运行，存着部件老化和先天不足等问题，目前已严重威胁着电站的安全运行，急需进行技术改造，在改造设计中，拟将发电机组由双水内冷方式改为全空冷式；水轮机在埋设部件基本不动的前提下重新选择机型以提高其出力和运行稳定性（机组额定出力由２６０ＭＷ提高到３２０

Technical transformation of twin internal water cooling generating unit with a capacity of 300 MW in Liujiaxia Hydro Station

No 5 generating unit of Liujiaxia Hydro Station is a twin internal water cooling hydrogenerator unit made in China, with a capacity of 300 MW It is the first and also unique twin internal water cooling hydrogenerator unit in China It was put into operation in 1973 Through the operation for about 20 years, many problems such as ageing of components have been found, which has seriously threatened the safe operation of the hydropower station at present so that it is urgently to conduct the technical transformation In the transformation design, it is proposed that the power generator could be transformed from twin internal water cooling type into fully air cooling type and the new hydro generator type should be used to increase its energy yield and the stability of operation But its embedded parts are basically unchanged (the nominal power output of the generating unit will be increased from 260 MW to 320 MW) The new generating unit will be imported from other countries Meanwhile, the main transformer will be replaced because of its shortage of capacity Through the transformation, such serious ageing generating unit will be transformed into a new one with the highly automation and the stability of operation It not only could increase the energy yield but also could increase the peaking capacity for the Northeast Power Network Such technical transformation will be started in October of 1999 and completed in August of 2000