| 摘要 |
This invention provides a clutch engagement detecting apparatus, which can accurately detect the state of engagement of a clutch using a helical spline engagement structure, and a single-shaft combined plant having it, and is constructed as follows: If the difference between the detected value of the rotational speed of a gas turbine and the detected value of the rotational speed of a steam turbine is not more than a detection error by the time a predetermined time elapses after load is charged into the steam turbine, it is determined that the clutch is engaged. If the detected value of the rotational speed of the steam turbine exceeds the detected value of the rotational speed of the gas turbine by a predetermined rotational speed alpha or more, or if the detected value of the rotational speed of the steam turbine falls short of the detected value of the rotational speed of the gas turbine by a predetermined rotational speed beta or more after detection of clutch engagement, it is determined that the clutch is abnormal. Alternatively, steam turbine rotation pulses are counted for each constant number of gas turbine rotation pulses, and subtraction or addition is done based on the counted value to obtain the relative rotation angle between the steam turbine and the gas turbine, thereby detecting clutch engagement.
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