Patent US3690739A successfully refreshed from Google Patents.
US3690739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase-angle regulator
Assignee: Westinghouse Electric Corp
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Filing: 1971-05-25
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Granted: 1972-09-12
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Expires: 1991-05-25
Abstract
Abstract Load tap changing regulator apparatus for high voltage power distribution systems. Two series transformers are used with separate excitation windings and tap changing means. The tap changers may be synchronized to provide phase-angle regulation with or without a change in the voltage.
Inventors
- 👤 Herbert L Prescott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:32
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
Regulator apparatus comprising first and second series transformers Each having primary and secondary windings with first and second leads, the first lead of the secondary winding of said first series transformer being connected to the first lead of the secondary winding of said second series transformer, the second lead of the secondary winding of said first series transformer being adaptable for connection to a source of alternating-current potential, the second lead of the secondary winding of said second series transformer being adaptable for connection to a load, the primary winding of said first series transformer being connected to an excitation transformer winding which, when excited, induces a voltage into the secondary winding of said first series transformer which is 90* out of phase with the voltage existing between the first lead of the secondary winding of said first series transformer and another point, the primary winding of said second series transformer being connected to an excitation transformer winding which, when excited, induces a voltage into the secondary winding of said second series transformer which is 90* out of phase with the voltage existing between the first lead of the secondary winding of said second series transformer and said other point.
Claim 2
Dependent Claim
200 words
Regulator apparatus comprising first and second series transformers Each having primary and secondary windings with first and second leads, the first lead of the secondary winding of said first series transformer being connected to the first lead of the secondary winding of said second series transformer, the second lead of the secondary winding of said first series transformer being adaptable for connection to a source of alternating-current potential, the second lead of the secondary winding of said second series transformer being adaptable for connection to a load, the primary winding of said first series transformer being connected to an excitation transformer winding which, when excited, induces a voltage into the secondary winding of said first series transformer which is 90* out of phase with the voltage existing between the first lead of the secondary winding of said first series transformer and another point, the primary winding of said second series transformer being connected to an excitation transformer winding which, when excited, induces a voltage into the secondary winding of said second series transformer which is 90* out of phase with the voltage existing between the first lead of the secondary winding of said second series transformer and said other point.
Claim 3
Dependent Claim
43 words
The regulator apparatus of claim 1 wherein the series transformers are connected to excitation transformers having tapped windings through tap changing means, said tap changing means selecting taps on the excitation windings which will induce the desired voltage in the series transformer secondary.
Claim 4
Dependent Claim
32 words
The regulator apparatus of claim 2 wherein the tap changing means selects taps which induce voltages into the series transformers which are equal in amplitude and are in phase with each other.
Claim 5
Dependent Claim
34 words
The regulator apparatus of claim 2 wherein the tap changing means selects taps which induce voltages into the series transformers which are equal in amplitude and are 180* out of phase with each other.
Claim 6
Dependent Claim
31 words
The regulator apparatus of claim 2 wherein the tap changing means selects taps which induce voltages into the series transformers which are in phase with each other and have unequal amplitudes.
Claim 7
Dependent Claim
33 words
The regulator apparatus of claim 2 wherein the tap changing means selects taps which induce voltages into the series transformers which are unequal in amplitude and 180* out of phase with each other.
Claim 8
Dependent Claim
326 words
Three-phase regulator apparatus comprising first and second series transformers each having three primary and three secondary windings with first and second leads, the first lead of a secondary winding of said first series transformer being connected to the first lead of a secondary winding of said second series transformers, the second lead of the secondary winding of said first series transformer being adaptable for connection to a three-phase alternating-current potential source, the second lead of the secondary winding of said second series transformer being adaptable for connection to a load, the primary windings of said first series transformer being connected through a first tap changing means to a first three-phase tapped excitation transformer winding which, when excited, induces a voltage into a secondary winding of said first series transformer which is 90* out of phase with the voltage existing between the first lead of said secondary winding of said first series transformer and another point, the primary windings of said second series transformer being connected through tap changing means to a second three-phase tapped excitation transformer winding which, when excited, induces a voltage into the secondary winding of said second series transformer which is 90* out of phase with the voltage existing between the first lead of said secondary winding of said second series transformer and another point, said tap changing means comprising movable and stationary contacts and phase reversing means which determine the magnitude and phase of the induced voltages in the secondaries of said series transformers, saiD tap changing means providing, when the phase reversing switches are in one position, induced voltages in the secondaries of said first series transformer which are 180* out of phase with the induced voltages in the secondaries of said second series transformer, and when the phase reversal switches are in another position, induced voltages in the secondaries of said first series transformer which are in phase with the induced voltages in the secondaries of said second series transformer.
Claim 9
Dependent Claim
326 words
Three-phase regulator apparatus comprising first and second series transformers each having three primary and three secondary windings with first and second leads, the first lead of a secondary winding of said first series transformer being connected to the first lead of a secondary winding of said second series transformers, the second lead of the secondary winding of said first series transformer being adaptable for connection to a three-phase alternating-current potential source, the second lead of the secondary winding of said second series transformer being adaptable for connection to a load, the primary windings of said first series transformer being connected through a first tap changing means to a first three-phase tapped excitation transformer winding which, when excited, induces a voltage into a secondary winding of said first series transformer which is 90* out of phase with the voltage existing between the first lead of said secondary winding of said first series transformer and another point, the primary windings of said second series transformer being connected through tap changing means to a second three-phase tapped excitation transformer winding which, when excited, induces a voltage into the secondary winding of said second series transformer which is 90* out of phase with the voltage existing between the first lead of said secondary winding of said second series transformer and another point, said tap changing means comprising movable and stationary contacts and phase reversing means which determine the magnitude and phase of the induced voltages in the secondaries of said series transformers, saiD tap changing means providing, when the phase reversing switches are in one position, induced voltages in the secondaries of said first series transformer which are 180* out of phase with the induced voltages in the secondaries of said second series transformer, and when the phase reversal switches are in another position, induced voltages in the secondaries of said first series transformer which are in phase with the induced voltages in the secondaries of said second series transformer.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |