| 摘要 |
PURPOSE:To control output fluctuation at the time of governing valve tests under arbitrary loads by performing operations for flow rate correction bias value when testing governing valves of a steam turbine on the basis of a flow rate signal converted from valve opening signal to a rated pressure. CONSTITUTION:In a flow rate correction bias values-arithmetic logical operation unit 10 for testing the governing valves of a turbine, the valve-opening signals jA, jB fed back from respective governing valves are inputted in function generators 20A, 20B and then converted into flow rate signals pA, pB of respective valves. By adding these flow rate signals by the use of an adding machine 21, a valve-total flow rate signal q is obtained, and the flow rate correction bias signal s is made from a deviation r of a main controlled flow rate-requirement signal f from the said value q through a proportional operation unit 23. When testing the valves, the bias signal s is added to the main correction flow rate- requirement signal f through a change over switch 24, and fed to the control device as a correction flow rate-requirement signal g. |
