| 摘要 |
PURPOSE:To prevent an abnormally big surging by a method wherein the opening and closing speed of the guide vane of the rotary hydraulic machine for a hydraulic power plant having a surge tank is controlled in accordance with the fluctuation of a water level so as to maintain the water level in the surge tank within a predetermined range. CONSTITUTION:The surge tank is provided in at least one of the upstream side or the downstream side of a water way for the hydraulic power plant and when the water level in the tank has lowered to a value below a predetermined value, for example, a solenoid valve 18 is energized by a control circuit to operate a hydraulic cylinder 17. Then, a rod 15 is descended to a predetermined position. When a piston 7 is elevated to drive a servomotor 1 in order to open the guide vane, the stopper 13 of a rod 8 is abutted against the rod 15 to stop it, the opening degree of a main pressure distributing valve 5 is limited, the amount of pressurized oil flowing into the servomotor 1 from a pipeline 3 is also limited and the opening speed of the guide vane is restricted to a value below an allowable one. |
