US3971219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine control system
Assignee: General Electric Co
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Filing: 1975-08-22
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Granted: 1976-07-27
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Expires: 1995-08-22
Abstract
Abstract A control system for an extraction type steam turbine driven by steam from a steam generator wherein it is desired to control the steam pressure in the steam generator, at a predetermined level, by varying the position of the steam inlet valve. Turbine speed may be controlled at a predetermined level by varying the position of an extraction control valve. The inlet valve and the extraction valve are independently operable except under a condition where the extraction valve is completely closed and the turbine speed continues to rise. In this instance, means are provided for positioning the inlet valve according to a speed control signal which dominates an inlet pressure control signal for lowering the inlet steam valve until normal conditions are restored.
Inventors
- 👤 Franklyn H. Taylor
- 👤 Edward J. Finck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:53
CPC Classifications
F; F01; F01K; F01K7/00; F01K7/34; F01K7/345
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
188 words
A control system for an extraction steam turbine of the type having a steam inlet valve and an extraction control valve, said steam turbine being driven by steam from a steam generator in fluid communication with said steam inlet valve through a steam inlet conduit, said control system comprising: means for sensing a steam inlet condition and for comparing said steam inlet condition with a reference steam condition to derive a steam condition control signal; means for sensing turbine speed and for comparing said turbine speed with a reference speed to derive a speed control signal; means for positioning said extraction control valve in response to said speed control signal; and, means for positioning said steam inlet valve, said inlet valve positioning means having a first input proportional to said steam condition control signal and a second input proportional to said speed control signal; and, said inlet valve positioning means having a single output for positioning said steam inlet valve, said output being in accordance with said steam condition control signal unless it is overridden by said speed control signal calling for a lower inlet steam valve position.
Claim 2
Dependent Claim
188 words
A control system for an extraction steam turbine of the type having a steam inlet valve and an extraction control valve, said steam turbine being driven by steam from a steam generator in fluid communication with said steam inlet valve through a steam inlet conduit, said control system comprising: means for sensing a steam inlet condition and for comparing said steam inlet condition with a reference steam condition to derive a steam condition control signal; means for sensing turbine speed and for comparing said turbine speed with a reference speed to derive a speed control signal; means for positioning said extraction control valve in response to said speed control signal; and, means for positioning said steam inlet valve, said inlet valve positioning means having a first input proportional to said steam condition control signal and a second input proportional to said speed control signal; and, said inlet valve positioning means having a single output for positioning said steam inlet valve, said output being in accordance with said steam condition control signal unless it is overridden by said speed control signal calling for a lower inlet steam valve position.
Claim 3
Dependent Claim
21 words
The control system recited in claim 1 wherein said steam inlet condition is steam pressure upstream from said steam inlet valve.
Claim 4
Dependent Claim
21 words
The control system recited in claim 1 wherein said steam inlet condition is steam flow upstream from said steam inlet valve.
Claim 5
Dependent Claim
81 words
The control system recited in claim 1 wherein said steam inlet valve positioning means comprises: a pressurized fluid manifold having first and second independently positionable input pilot valves and a fluid controlled output piston; said first input pilot valve positioned by said steam condition control signal, said second input pilot valve positioned by said speed control signal; said second pilot valve being operative to dump pressurized fluid only when said extraction control valve is closed and turbine speed continues to rise.
Claim 6
Dependent Claim
19 words
The control system recited in claim 4 wherein the output piston is operatively connected to the steam inlet valve.
Claim 7
Dependent Claim
29 words
The control system recited in claim 1 wherein the extraction steam turbine includes an extraction conduit downstream from said steam inlet valve and upstream from said extraction control valve.
Claim 8
Dependent Claim
167 words
A control system for a steam turbine having a steam inlet valve and an extraction control valve, said turbine further including an extraction conduit downstream from the steam inlet valve and upstream from the extraction control valve; and, said steam turbine being driven by steam from a steam generator in fluid communication with said steam inlet valve through a steam inlet conduit, said control system comprising: means for providing a first signal proportional to the difference between a reference steam inlet pressure and the actual steam inlet pressure; means for providing a second signal proportional to the difference between a reference turbine speed and the actual turbine speed; means for positioning said extraction control valve in response to said second signal; means for positioning said steam inlet valve, said inlet valve positioning means including a gating device having first and second inputs corresponding to said first and second signals, respectively, the output of said gating device following whichever input calls for the lowest steam inlet valve position.
Claim 9
Dependent Claim
167 words
A control system for a steam turbine having a steam inlet valve and an extraction control valve, said turbine further including an extraction conduit downstream from the steam inlet valve and upstream from the extraction control valve; and, said steam turbine being driven by steam from a steam generator in fluid communication with said steam inlet valve through a steam inlet conduit, said control system comprising: means for providing a first signal proportional to the difference between a reference steam inlet pressure and the actual steam inlet pressure; means for providing a second signal proportional to the difference between a reference turbine speed and the actual turbine speed; means for positioning said extraction control valve in response to said second signal; means for positioning said steam inlet valve, said inlet valve positioning means including a gating device having first and second inputs corresponding to said first and second signals, respectively, the output of said gating device following whichever input calls for the lowest steam inlet valve position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |