Torque limiter for prime mover
An improved turbine control system is described for a steam turbine of the type having a control valve for regulating the flow of steam into the steam turbine. The control system includes a speed reference input signal and a speed feedback signal indicative of turbine shaft speed. The control system further includes a first summing junction for combining the speed reference signal and the speed feedback signal to provide a valve position command signal. A second summing junction is included for combining the valve position command signal with at least one valve actual position signal to provide a valve position error signal. The improvement to the control system consists of: means for sensing steam pressure in the steam turbine and providing a pressure signal; means for converting the pressure signal into a steam flow signal; a first signal limiter connected upstream from the first summing junction for receiving a maximum allowable speed signal in accordance with the steam flow signal; and, a second signal limiter connected downstream from the first summing junction but upstream from the second summing junction for receiving a maximum allowable valve position signal in accordance with the steam flow signal; and, wherein flow converted to speed and flow converted to valve position are maximum allowable torque signals.
- Assignee:
- General Electric Co., Schenectady, NY
- Patent Number(s):
- US 4687410
- OSTI ID:
- 6130171
- Country of Publication:
- United States
- Language:
- English
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