| 摘要 |
PURPOSE:To enable the same steam quantity as the steam quantity which passed through a turbine immediately before stopping said turbine to flow from a bypass valve by keeping a bypass-valve opening signal corresponding to the flow rate of turbine passing steam following transmitted, and stopping the following operation at the same time the turbine is stopped. CONSTITUTION:An operating device 102 operates a control valve opening corresponding to the output of a flow rate transmitting device 101 for measuring the flow rate of a top-turbine passing steam, and transmits the operated opening as a following signal to a following type signal generating device 103. This signal generating device 103 serves so as to maintain the control valve opening signal immediately before the stoppage of a turbine, when a turbine is stopped and a signal is generated from a turbine stoppage detecting circuit 106. Also, at the same time, solenoid valves 108, 109 are opened by means of a signal changeover device 107, operating a booster relay 110 to open a turbine bypass control valve 19 up to a control valve opening which has been held by an electric/air converter 104. Further, the control valve opening signal is sent out to a pressure control system via a signal switchover device 105.
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