OPERATING METHOD FOR HYDRAULIC MACHINE

PURPOSE:To perform stable operation control over partial load operation and partial flow operation, or even at time of transition by opening a feed valve when the detected value of a vibro-sensor has exceeded the setting value and, after continuing air supply into a hydraulic machine passage as long as the specified time, closing the feed valve. CONSTITUTION:Water in a water-conveying casing 1 is led into a turbine passage 3 via a guide vane 2. If so, a runner vane 4 is rotated by a water flow going down in the turbine passage 3, driving a generator connected to a main shaft. In this case, when each signal out of vibro-sensors 17, 18, 19 is exceeded the specified value prestored in a memory of an arithmetic and control unit 20, a feed valve open command is transmitted to feed valve controllers 11, 15. With this command, feed valves 10, 14 are opened, and air supply into the turbine passage 3 is started. After the elapse of setting time, a feed valve close command is outputted to these feed valve controllers 11, 15 from the arithmetic and control unit 20.