| 摘要 |
An overspeed detection circuit for producing an overspeed trip signal for shutting off a supply of motive fluid to a prime mover upon the prime mover exceeding an overspeed trip limit includes a differentiating circuit effective to differentiate a speed signal to produce an acceleration signal related to the rate of change in the speed signal. The acceleration signal is summed with the speed signal to produce an effective speed signal which anticipates the crossing of an overspeed threshold when a fault permits a constant speed increase to occur but does not force the summed signal to cross the overspeed threshold when normal speed control is exercised.
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