| 摘要 |
PURPOSE:To improve availability of a plant, by connecting a return guide, from the outlet of a bottom stage guide vane in a bottom stage runner to the inlet of a vane in an upper stage runner, to a draft tube through a bypass pipe line. CONSTITUTION:A return guide 13, from the outlet of a bottom stage guide vane 11 in a bottom stage runner 9 to the inlet of an upper stage runner vane 8a, is connected to a draft tube 5 by a bypass pipe line 15 equipped with a stop valve 14. In this way, if the valve 14 is opened, only an upper stage runner 8 is usefully operated while excepting the runner 9 from use, and partial head opeation remarkably lower than a rating can be performed, then the necessity for an initial charge water pump 7 is eliminated to decrease an expense, while utilization of a main machine can charge a considerable flow amount of water, further required days for a water charge can be decreased to improve availability of a plant. |
