Method of and apparatus for operating pump turbine

摘要

In a method of operating a pump turbine, compressed air is supplied into a runner chamber of the turbine and a leakage drain valve is opened of a guide vane at the time of starting the pump turbine to force downwardly the level of the water in the runner chamber and to rotate a runner of the pump turbine in air, the compressed air in the runner chamber is exhausted when the rotating speed of the runner reaches a rated speed for the pump operation, thus filling the runner chamber with water. The water containing a large quantity of dissolved oxygen and contained near the periphery of the runner is drained into a spillway through a pipe for draining water leakage through the guide vanes, priming pressure in the runner chamber is detected and a leakage drain valve in the drain pipe is closed after a predetermined time from the detection of the priming pressure.