US4201925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for starting hydraulic turbine generator
Assignee: Hitachi Ltd
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Filing: 1977-07-25
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Granted: 1980-05-06
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Expires: 1997-07-25
Abstract
Abstract A method for improving the starting phase of the running of a hydraulic turbine or pump turbine. According to this method, an opening of wicket gates is increased as a function of an increase in r.p.m. of a runner, so that the flow rate of water running into a runner may be maintained constant throughout acceleration and synchronizing process to the rated speed once attained said constant value at an early stage of starting.
Inventors
- 👤 Takao Kuwabara
- 👤 Hiroshi Okumura
- 👤 Toshiaki Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:55
CPC Classifications
F; F03; F03B; F03B15/00; F03B15/005; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
A method for starting a hydraulic turbine system having a generator, a turbine with a runner coupled to drive the generator at a rated r.p.m., and wicket gates for adjusting the flow rate of water running into the runner, comprising the steps of: quickly opening the wicket gates from a fully closed condition of the rates until the flow rate of the water reaches the fixed flow rate that corresponds to operation of the turbine at rated r.p.m. and the design no-load wicket gate opening for the head during the step; thereafter slowing opening the wicket gates to maintain the fixed flow rate as the speed increases to the rated r.p.m., to thereby compensate for the tendency to reduce turbine flow rate with an increase in r.p.m. of the runner; and thereafter synchronizing the turbine-generator at no-load to an electric power transmission system.
Claim 2
Independent Claim
143 words
A method for starting a hydraulic turbine system having a generator, a turbine with a runner coupled to drive the generator at a rated r.p.m., and wicket gates for adjusting the flow rate of water running into the runner, comprising the steps of: quickly opening the wicket gates from a fully closed condition of the rates until the flow rate of the water reaches the fixed flow rate that corresponds to operation of the turbine at rated r.p.m. and the design no-load wicket gate opening for the head during the step; thereafter slowing opening the wicket gates to maintain the fixed flow rate as the speed increases to the rated r.p.m., to thereby compensate for the tendency to reduce turbine flow rate with an increase in r.p.m. of the runner; and thereafter synchronizing the turbine-generator at no-load to an electric power transmission system.
Claim 3
Dependent Claim
77 words
A method as defined in claim 1, wherein no matter how quick the wicket gates have been opened and how much overshooting of the wicket gates beyond said no-load opening has been allowed at the beginning of starting of the turbine, the wicket gates are opened so as to maintain flow rate at approximately the value corresponding to the no-load opening of the wicket gates and the rated speed when the turbine/generator speed approaches the rated value.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |