Patent US3748491A successfully refreshed from Google Patents.
US3748491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable rate load setback circuit
Assignee: General Electric Co
•
Filing: 1972-06-21
•
Granted: 1973-07-24
•
Expires: 1992-06-21
Abstract
Abstract A turbine control circuit which adjust the rate of power reduction by adjusting a load reference signal to control a steam control valve to compensate for the rate of loss of steam for the continued operation of a turbine with a failed component in the steam generating loop.
Inventors
- 👤 C Barrigher
- 👤 C Devlin
- 👤 P Malone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:27
CPC Classifications
F; F01; F01D; F01D21/00; F01D21/14; F01D17/00; F01D17/20; F01D17/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
52 words
A turbine control circuit comprising: means for receiving a load reference signal proportional to a desired load on a turbine; means for linearly decreasing the load reference signal at a predetermined rate to form a load setback reference signal; and means for clamping the load setback reference signal at a preset level.
Claim 2
Dependent Claim
52 words
A turbine control circuit comprising: means for receiving a load reference signal proportional to a desired load on a turbine; means for linearly decreasing the load reference signal at a predetermined rate to form a load setback reference signal; and means for clamping the load setback reference signal at a preset level.
Claim 3
Dependent Claim
21 words
A turbine control circuit as in claim 1 wherein said means for linearly decreasing the load reference signal is an integrator.
Claim 4
Dependent Claim
47 words
A turbine control circuit as in claim 2 wherein said integrator further comprises a first operational amplifier having a first feedback loop, a capacitor in series in said first feedback loop, and means for connecting a first preset bias to an input of said first operational amplifier.
Claim 5
Dependent Claim
15 words
A turbine control circuit as in claim 3 wherein said first preset bias is variable.
Claim 6
Dependent Claim
21 words
A turbine control circuit as in claim 1 wherein said means for clamping the load setback reference signal is a limiter.
Claim 7
Dependent Claim
47 words
A turbine contrOl circuit as in claim 5 wherein said limiter further comprises a second operational amplifier having a second feedback loop, a resistor in series in said second feedback loop, and means for connecting a second preset bias to an input of said second operational amplifier.
Claim 8
Dependent Claim
15 words
A turbine control circuit as in claim 6 wherein said second preset bias is variable.
Claim 9
Dependent Claim
20 words
A turbine control circuit as in claim 3 wherein said means for connecting the first preset bias is remotely controlled.
Claim 10
Dependent Claim
20 words
A turbine control circuit as in claim 6 wherein said means for connecting the second preset bias is remotely controlled.
Claim 11
Dependent Claim
121 words
A turbine control circuit comprising: means for receiving a load reference signal proportional to a desired load on the turbine; an integrator circuit for linearly decreasing the load reference signal at a predetermined rate to form a load setback reference signal, said integrator circuit further comprising a first operational amplifier having a first feedback loop, a capacitor in series in said first feedback loop, and means for connecting a first preset bias to an input of said first operational amplifier; and a limiter circuit for clamping said load setback reference signal at a preset level comprising a second operational amplifier having a second feedback loop and means for connecting a second preset bias to an input of said second operational amplifier.
Claim 12
Dependent Claim
121 words
A turbine control circuit comprising: means for receiving a load reference signal proportional to a desired load on the turbine; an integrator circuit for linearly decreasing the load reference signal at a predetermined rate to form a load setback reference signal, said integrator circuit further comprising a first operational amplifier having a first feedback loop, a capacitor in series in said first feedback loop, and means for connecting a first preset bias to an input of said first operational amplifier; and a limiter circuit for clamping said load setback reference signal at a preset level comprising a second operational amplifier having a second feedback loop and means for connecting a second preset bias to an input of said second operational amplifier.
Claim 13
Dependent Claim
17 words
A turbine control circuit as in claim 10 wherein said first and second preset biases are variable.
Claim 14
Dependent Claim
30 words
A turbine control circuit as in claim 10 wherein said means for connecting the first preset bias and said means for connecting the second preset bias are simultaneously remotely controlled.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |