| 摘要 |
PURPOSE:To prevent the overheat of a blade by installing a solenoid valve which is turned on and off in accordance with the detected value of a generator output in series with a mixed-pressure steam pressure controlling device in a hydraulic circuit for controlling a mixed-pressure governing valve and, when a load is cut off, closing said mixed-pressure governing valve via said solenoid valve. CONSTITUTION:In a mixed-pressure extraction turbine generator consisting of a turbine which consists of high-pressure and low-pressure turbines 1, 2 and a condenser 3 and a generator 4 which is connected to a turbine wheel shaft via a coupling, a mixed- pressure steam from a waste heat boiler 10 and with a pressure lower than the pressure of steam from a main boiler flows into the high-pressure turbine 1 via a pipe line 11 in which a mixed-pressure governing valve 12 is provided. In this case, an oil dis charge pipe having a solenoid valve 18 as a rapid closing valve is branched off of a pipe line for transmitting a mixed-pressure steam output oil pressure from a mixed- pressure steam pressure controlling device 25. And, when the cut off of a load is detected by a load cut-off detector, the solenoid valve 18 is opened to discharge a pressure oil having the mixed-pressure steam output oil pressure transmitted via a passage 36.
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