US3605006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound excitation system of ac generator by thyristor control
Assignee: Fuji Electric Co Ltd
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Filing: 1969-07-07
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Granted: 1971-09-14
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Expires: 1989-07-07
Abstract
Abstract For the excitation of an AC generator, a voltage being in proportion to the terminal voltage of the generator and a voltage being in proportion to the load current of the generator are combined vectorially, and the resultant sum-voltage is impressed on a field winding of the generator through a rectifying device with thyristors for the supply of a field current. Separately, an electric quantity of the same phase as the resultant voltage is prepared as a synchronizing signal for an ignition pulse regulator controlling the thyristors.
Inventors
- 👤 Masaomi Nagae
- 👤 Sumio Yokokawa
- 👤 Takehito Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:19
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/38
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
194 words
A thyristor excitation system of AC generators, comprising first means for obtaining a first voltage being in proportion to a terminal voltage of an AC generator, second means for obtaining a second voltage being in proportion to a load current of the generator, means for obtaining a first sum-voltage by vectorially combining said first voltage and said second voltage, a rectifying device with thyristors to rectify and control said sum-voltage and supply a controlled field current to a field winding of the generator or an exciter thereof, a regulator for generating a control deviation between an electrical output of the generator and a reference value of the electrical output, third means for obtaining a third voltage being in proportion to said first voltage, fourth means for obtaining a fourth voltage being in proportion to said second voltage, means for obtaining a second sum-voltage of the same phase as said first sum-voltage by combining said third voltage and said fourth voltage, and an ignition pulse adjuster supplied, as input, with said control deviation and, as synchronizing signal, with said second sumvoltage and adapted to supply phase-controlled ignition pulses to said thyristors of said rectifying device.
Claim 2
Dependent Claim
194 words
A thyristor excitation system of AC generators, comprising first means for obtaining a first voltage being in proportion to a terminal voltage of an AC generator, second means for obtaining a second voltage being in proportion to a load current of the generator, means for obtaining a first sum-voltage by vectorially combining said first voltage and said second voltage, a rectifying device with thyristors to rectify and control said sum-voltage and supply a controlled field current to a field winding of the generator or an exciter thereof, a regulator for generating a control deviation between an electrical output of the generator and a reference value of the electrical output, third means for obtaining a third voltage being in proportion to said first voltage, fourth means for obtaining a fourth voltage being in proportion to said second voltage, means for obtaining a second sum-voltage of the same phase as said first sum-voltage by combining said third voltage and said fourth voltage, and an ignition pulse adjuster supplied, as input, with said control deviation and, as synchronizing signal, with said second sumvoltage and adapted to supply phase-controlled ignition pulses to said thyristors of said rectifying device.
Claim 3
Dependent Claim
51 words
A thyristor excitation system of AC generator, as claimed in claim 1, in which the first and second means are, respectively, a transformer and a gap-provided current transformer, and the means for obtaining the first sum-voltage consists of a circuit obtained by connecting the secondary windings of said transformers in series.
Claim 4
Dependent Claim
51 words
A thyristor excitation system of AC generator, as claimed in claim 1, in which the first and second means are, respectively, a transformer and a leakage current transformer, and the means for obtaining the first sum-voltage consists of a circuit obtained by connectinG the secondary windings of said transformers in series.
Claim 5
Dependent Claim
64 words
A thyristor excitation system of AC generator, as claimed in claim 1, in which the first and second means are, respectively, transformer and a current transformer provided with a reactor connected in parallel to the secondary winding of said current transformer, and the means for obtaining the first sum-voltage consists of a circuit obtained by connecting the secondary windings of said transformers in series.
References Cited (Backward Citations)
US3058050A
Cited
US3076134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |