Abstract:
In this research a study on the pump turbine was conducted and found that in case the hydraulic system failure to close the wicket gate and runner blade of the pump turbine the speed of the pump turbine will increase and leading to a complete damage for the turbine. The company is forced to replace the turbine and this leads to high cost. A controller of the downstream roller gate for the pump turbine in Khashm-Algirba dam power station was designed and the prototype of the control system was conducted and tested in electronic laboratory kits. According to the results obtained it was found when the speed of the pump turbine reached to 1080 rpm the controller sent a signal for issued sound and light alarm and when the speed reached to 1260 rpm the controller sent signal to the downstream roller gate servo-valve to open it for close the downstream roller gate to stop the pump turbine. The Downstream gate of the pump turbine was closed in 60 seconds, leading to the unit being safely shut down.
