Method of controlling wicket gates of a pump-turbine

摘要

A method of controlling wicket gates of a pump-turbine which prevents abnormal hydraulic pressure variation when load carried on the pump-turbine is removed during the turbine operation thereof. The wicket gates are controlled to open when it is detected that discharge per unit head reduces with the reduction of speed per unit head. When it is once detected that the ratio of variation in the discharge per unit head to the variation in the speed per unit head is reversed from a positive value to a negative value, the wicket gates are closed.