US3782008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchroscope training device
Assignee: Singer Co
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Filing: 1972-05-09
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Granted: 1974-01-01
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Expires: 1992-05-09
Abstract
Abstract This is a system for simulating the operation of a synchroscope in an alternating current generating system which includes a power network or bus and a plurality of alternators which are to be paralleled to that bus. The system is usually a part of a large simulation system such as that which depicts the operation of a complete power plant. The simulator computer designates one of the alternators as the reference alternator which is presently supplying power to the bus. The reference frequency is designated by a number output from the computer, the value of which number represents the frequency of a variable frequency oscillator. A second output word from the computer represents the frequency of the second alternator which is to be paralleled to the first. This word is also converted to a voltage which determines the output frequency of a second variable frequency oscillator. The outputs of the two oscillators are then applied to the two coils of a standard synchroscope.
Inventors
- 👤 E Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:52
CPC Classifications
G; G09; G09B; G09B23/00; G09B23/06; G09B23/18; G09B23/188
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
Apparatus for simulating equipment used for paralleling alternators, said apparatus comprising a first source of alternating signals for representing a first alternator, a second source of alternating signals for representing a second alternator, a synchroscope having separate inputs for first and second alternators, means for connecting the output from said first source to the input of said synchroscope for said first alternator, means for connecting the output from said second source to the input of said synchroscope for said second alternator, means for establishing a datum frequency of the signals generated by said first source, and means for varying the frequency of the signals generated by said second source until said synchroscope indicates that the signals generated by said first and second sources are of the same frequency, said means for generating a changeable voltage comprising a digital number source, and means connected to said number source for converting the number from said number source into a voltage whose amplitude is proportional to the size of said number.
Claim 2
Dependent Claim
168 words
Apparatus for simulating equipment used for paralleling alternators, said apparatus comprising a first source of alternating signals for representing a first alternator, a second source of alternating signals for representing a second alternator, a synchroscope having separate inputs for first and second alternators, means for connecting the output from said first source to the input of said synchroscope for said first alternator, means for connecting the output from said second source to the input of said synchroscope for said second alternator, means for establishing a datum frequency of the signals generated by said first source, and means for varying the frequency of the signals generated by said second source until said synchroscope indicates that the signals generated by said first and second sources are of the same frequency, said means for generating a changeable voltage comprising a digital number source, and means connected to said number source for converting the number from said number source into a voltage whose amplitude is proportional to the size of said number.
Claim 3
Dependent Claim
15 words
The apparatus defined in claim 1 wherein said second source comprises a voltage controlled oscillator.
Claim 4
Dependent Claim
45 words
The apparatus defined in claim 2 wherein said means for varying the frequency of the signals generated by said second source includes a controlled means for generating a selectably changeable voltage, and means for applying the voltage from said generating means to said second source.
Claim 5
Dependent Claim
18 words
The apparatus defined in claim 1 wherein said first and second sources each comprise a voltage controlled oscillator.
Claim 6
Dependent Claim
84 words
The apparatus defined in claim 4 wherein said means for establishing a datum for said first source comprises a first controlled means for generating a first selectably changeable voltage, wherein said means for varying the frequency of the signals generated by said second source comprises a second controlled means for generating a second selectably changeable voltage, and further including first means for applying said first changeable voltage to said first source and second means for applying said second changeable voltage to said second source.
Claim 7
Dependent Claim
51 words
The apparatus defined in claim 5 wherein each of said means for generating said selectably changeable voltage comprises a separate digital number source, and means connected to said number source for converting the number from said number source into a voltage whose amplitude is proportional to the size of said number.
Claim 8
Dependent Claim
15 words
The apparatus defined in claim 6 wherein said digital number sources comprise a digital computer.
References Cited (Backward Citations)
US2685674A
Cited
US3621350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |