GUIDE VANE CLOSING SPEED CONTROL METHOD AND DEVICE OF REVERSIBLE PUMP-TURBINE

摘要

PURPOSE:To close a guide vane safely even in the case where a guide vane closing speed selector or a guide vane opening detector has got out of order by limiting the upper limit of guide vane closing speed to the specified value set up at a time when opening of the guide vane is less than the specified value whenever the revolution of a reversible pump-turbine is higher than the rated speed. CONSTITUTION:When a guide vane is more than the specified opening, the upper limit of closing speed in this guide vane is limited to a first specified value. When the opening of the guide vane is less than the specified opening, the upper limit of closing speed in the guide vane is limited to a second specified value lower than the first specified value. In addition, the revolution of this pump-turbine is detected, and when this detected revolution is more than the specified revolution higher than the rated speed, the upper limit of guide vane closing speed is limited to the second specified value. A stop piston 13 sets the upper limit of guide vane closing speed before each buckling of a pump operation mode and a turbine operation mode, and further this stop piston 15 determines the upper limit of the guide vane closing speed after the buckling of the turbine operation mode in response to the revolution speed.