| 摘要 |
A steam turbine plant incorporating high and low pressure shaft coupled turbines connected in series in the steam flow path from the steam generator also includes a water separator in the steam flow path between the two turbines. Steam flow control valves controlled by a turbine shaft speed governor function to control the amount of steam going to the turbines, and safety shut-off valves controlled by a turbine shaft speed monitor function to shut-off the steam supply to the turbines in the event the turbine shaft exceeds a predetermined safe speed limit. In order to avoid build-up of any dangerous steam over-pressure from arising within the water separator, steam pressure responsive devices are included which operate in conjunction with the speed responsive controls so as to also shut off the steam flow, thus providing a control system operating conjointly on two different parameters, namely, turbine shaft speed and steam pressure. |
