Patent US4004191A successfully refreshed from Google Patents.
US4004191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing current unbalance in a three-phase power transmission line operating with one faulty phase
Assignee: Individual
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Filing: 1975-05-02
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Granted: 1977-01-18
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Expires: 1995-05-02
Abstract
Abstract A method for reducing current unbalance in the electric system of a three-phase A.C. power transmission line operating in an incomplete phase regime using the wires of the line and transformers electrically coupled thereto. A disconnected wire of the line operating in the incomplete phase regime is grounded at one end thereof and a suitable alternating voltage source is connected at the other end thereof to increase the current flowing through the transformer neutrals, thus reducing current unbalance in the electric system. An embodiment of the invention provides for the use of a lightning protection wire rope instead of the wire in case the latter is broken.
Inventors
- 👤 Jury Fedorovich Koroljuk
- 👤 Lidia Petrovna Scherbakova
- 👤 Jury Andreevich Vakulenko
- 👤 Vladimir Nikolaevich Matrosov
- 👤 Viktor Demyanovich Rud
- 👤 Timofei Vasilievich Chelyshev
- 👤 Vyacheslav Viktorovich Shabashov
- 👤 Vladislav Vasilievich Shubnikov
- 👤 Vadim Lvovich Schedrikov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:51
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/26; Y; Y02; Y02E; Y02E40/00; Y02E40/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A method for reducing current unbalance in the electric system of a three-phase A.C. power transmission line operating in an incomplete phase regime using the wires of the line and transformers electrically coupled thereto, comprising the following steps: providing an electric closed loop circuit comprising the line operating in the incomplete phase regime, a wire insulated from ground and disposed parallel to said line along the whole length thereof, and the neutrals of said transformers; connecting into the provided electric closed loop circuit a source of alternating voltage in phase with the electric system to which said line is connected; and selecting the corresponding phase and value of voltage of said source to obtain an increase of current flowing through the neutrals of said transformers, resulting in decreased current unbalance in the electric system.
Claim 2
Independent Claim
134 words
A method for reducing current unbalance in the electric system of a three-phase A.C. power transmission line operating in an incomplete phase regime using the wires of the line and transformers electrically coupled thereto, comprising the following steps: providing an electric closed loop circuit comprising the line operating in the incomplete phase regime, a wire insulated from ground and disposed parallel to said line along the whole length thereof, and the neutrals of said transformers; connecting into the provided electric closed loop circuit a source of alternating voltage in phase with the electric system to which said line is connected; and selecting the corresponding phase and value of voltage of said source to obtain an increase of current flowing through the neutrals of said transformers, resulting in decreased current unbalance in the electric system.
Claim 3
Dependent Claim
102 words
A method as claimed in claim 1, wherein the wire which is insulated relative to ground and disposed parallel to the line along the whole length thereof is a disconnected wire of said line, the method further comprising grounding the disconnected wire at one of the ends thereof, and connecting said alternating voltage source to the opposite end of said disconnected wire, connecting one of the windings of said voltage source between the disconnected wire and ground, and connecting the other winding of said voltage source to the phase or line voltage of the electric system to which said line is connected.
Claim 4
Dependent Claim
108 words
A method as claimed in claim 1, wherein the wire insulated relative to ground and disposed in parallel to the power transmission line is the line operating in the incomplete phase regime and serves as a lightning protection wire rope of said line, said method comprising grounding the rope at one of the ends thereof, connecting said alternating voltage source to the opposite end of said wire rope, connecting one of the windings of said voltage source between ground and the wire rope and connecting the other winding of said voltage source to the phase or line voltage of the electric system to which said line is connected.
Claim 5
Dependent Claim
113 words
A method as claimed in claim 1, wherein said closed loop circuit is provided by directly connecting one of the ends of the disconnected wire of the line operating in the incomplete phase regime to the neutral of at least one of the transformers electrically coupled with said line, the neutral of said transformer being disconnected from ground, the source of said alternating voltage being a transformer located at the opposite end of said disconnected wire, one of the windings of said transformer being connected between the disconnected wire and ground and the other winding being connected to the phase or line voltage of the electric system to which said line is connected.
Claim 6
Dependent Claim
121 words
A method as claimed in claim 1, wherein said closed loop circuit is obtained by directly connecting one of the ends of the lightning protection wire rope of said line, electrically insulated relative to ground along the entire length thereof, to the neutral of at least one of the transformers electrically coupled to said line, the neutral of said transformer being disconnected from ground; the source of said alternating voltage being a transformer located at the opposite end of said wire rope, one of the windings of said transformer being connected between the lightning protection wire rope and ground, while the other winding is connected to the phase or line voltage of the electric system to which said line is connected.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |