Patent US3813593A successfully refreshed from Google Patents.
US3813593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of turbine generator shaft torques
Assignee: General Electric Co
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Filing: 1973-05-04
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Granted: 1974-05-28
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Expires: 1993-05-04
Abstract
Abstract The invention discloses a new and improved means for attenuating and modifying sub-synchronous frequencies in a power transmission system through the use of a power filter comprising a plurality of serially connected, mutually coupled, parallel resonant circuits, wherein the individual parallel resonant circuits are tuned. A power filter is inserted serially in one side of each phase of the power transmission system.
Inventors
- 👤 J Tice
- 👤 C Bowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:34
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/02; H01F38/06; H02; H02P; H02P9/00; H02P9/10; H02P9/105
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A protection filter system for power generating equipment to be connected to a power line transmission system wherein the power generating equipment has inherent sub-synchronous natural resonant frequencies, said protective filter system comprising: a plurality of serially connected, mutually coupled, electrical resonant circuits, each of said electrical resonant circuits being tuned to a different one of said inherent sub-synchronous natural resonant frequencies, and means for inserting said protective filter in series with a power line of said transmission system.
Claim 2
Dependent Claim
79 words
A protection filter system for power generating equipment to be connected to a power line transmission system wherein the power generating equipment has inherent sub-synchronous natural resonant frequencies, said protective filter system comprising: a plurality of serially connected, mutually coupled, electrical resonant circuits, each of said electrical resonant circuits being tuned to a different one of said inherent sub-synchronous natural resonant frequencies, and means for inserting said protective filter in series with a power line of said transmission system.
Claim 3
Dependent Claim
91 words
An electric power generating and power transmission system including at least one phase and wherein said power generating portion of said system has inherent sub-synchronous natural resonant frequencies and said power transmission portion of said system has sub-synchronous frequencies developed thereon, a protection filter system connected in series with a line of each phase of said power transmission system, said protective filter system comprising a plurality of serially connected, electrical resonant circuits, each of said electrical resonant circuits being tuned to a different one of said inherent sub-synchronous natural resonant frequencies.
Claim 4
Dependent Claim
91 words
An electric power generating and power transmission system including at least one phase and wherein said power generating portion of said system has inherent sub-synchronous natural resonant frequencies and said power transmission portion of said system has sub-synchronous frequencies developed thereon, a protection filter system connected in series with a line of each phase of said power transmission system, said protective filter system comprising a plurality of serially connected, electrical resonant circuits, each of said electrical resonant circuits being tuned to a different one of said inherent sub-synchronous natural resonant frequencies.
Claim 5
Dependent Claim
31 words
The power generation and power transmission system and protective filter system therefor as defined in claim 2 and wherein said serially connected, electrical resonant circuits are mutually coupled to one another.
Claim 6
Dependent Claim
57 words
The power generation and power transmission system and protective filter system therefor as defined in claim 2 and wherein there are N inherent sub-synchronous natural resonant frequencies, each protective filter system comprises N sections and each of said electrical resonant circuits is tuned to a different frequency but corresponding to one of said N inherent sub-synchronous frequencies.
Claim 7
Dependent Claim
57 words
The power generation and power transmission system and protective filter system therefor as defined in claim 3 and wherein there are N inherent sub-synchronous natural resonant frequencies, each protective filter system comprises N sections and each of said electrical resonant circuits is tuned to a different frequency but corresponding to one of said N inherent sub-synchronous frequencies.
Claim 8
Dependent Claim
109 words
An electric power generating and power transmission system wherein said power generating portion of said system developes power in a multi-phase mode and said power generating portion of said system has inherent sub-synchronous natural resonant frequencies, And said power transmission portion of said system is a multi-phase mode transmission system wherein sub-synchronous frequencies may be developed, and a protective filter system connected in series with a line of each phase of said power transmission system, said protective filter system comprising a plurality of serially connected, mutually coupled, electrical resonant circuits, each of said electrical resonant circuits being tuned to a different one of said inherent sub-synchronous natural resonant frequencies.
Claim 9
Dependent Claim
109 words
An electric power generating and power transmission system wherein said power generating portion of said system developes power in a multi-phase mode and said power generating portion of said system has inherent sub-synchronous natural resonant frequencies, And said power transmission portion of said system is a multi-phase mode transmission system wherein sub-synchronous frequencies may be developed, and a protective filter system connected in series with a line of each phase of said power transmission system, said protective filter system comprising a plurality of serially connected, mutually coupled, electrical resonant circuits, each of said electrical resonant circuits being tuned to a different one of said inherent sub-synchronous natural resonant frequencies.
Claim 10
Dependent Claim
41 words
An electric power generating and power transmission system and a protective filter system therefor, as defined in claim 6 and wherein said multi-phase mode of said power generating portion of said system and said multi-phase transmission system are both three phase.
Claim 11
Dependent Claim
65 words
An electric power generating and power transmission system and a protective filter system therefor, as defined in claim 7 and wherein said multi-phase transmission system is in a wye mode having a common point and wherein said protective filter system connected in series with a line of each phase of said power transmission system is also connected to the common point of said wye mode.
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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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |