US3611227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer with tubular conductor coil
Assignee: Alstom Savoisienne SA
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Filing: 1970-03-04
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Granted: 1971-10-05
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Expires: 1990-03-04
Abstract
Abstract A transformer capable of resisting, without deformation, strong short circuit currents. The current transformer is immersed in an insulating liquid inside a container. Its primary winding consists of a tubular coil which is cooled by the circulation of insulating liquid, such as a suitable oil, through the tubular coil. An elongated tubular portion of the coil is separated into inlet and outlet channels for the cooling oil by an elongated flat conductor positioned within the tubular portion and insulated therefrom.
Inventors
- 👤 Jean Trabut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/28; H01F38/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
In a current transformer, immersed in an insulating liquid inside a receptacle, whose primary winding consists of a tubular conducting coil, the improvement wherein the tubular coil forms a turn which is galvanically interrupted by an insulating sleeve, one end of said turn being electrically connected to a rectilinear tubular conductor, and the other end of said turn being electrically connected to a substantially flat conductor which is mounted inside the rectilinear tubular conductor by means of insulating elements so as to divide the inside of the said rectilinear conductor into two enclosures through which the insulating liquid is brought into the tubular coil and is evacuated from it into the receptacle of the transformer.
Claim 2
Dependent Claim
115 words
In a current transformer, immersed in an insulating liquid inside a receptacle, whose primary winding consists of a tubular conducting coil, the improvement wherein the tubular coil forms a turn which is galvanically interrupted by an insulating sleeve, one end of said turn being electrically connected to a rectilinear tubular conductor, and the other end of said turn being electrically connected to a substantially flat conductor which is mounted inside the rectilinear tubular conductor by means of insulating elements so as to divide the inside of the said rectilinear conductor into two enclosures through which the insulating liquid is brought into the tubular coil and is evacuated from it into the receptacle of the transformer.
Claim 3
Dependent Claim
46 words
A current transformer according to claim 1, wherein the insulating elements which keep the flat conductor in place are bars which extend all along the length of the rectilinear tubular conductor and each has a groove in which an edge of the flat conductor is mounted.
Claim 4
Dependent Claim
54 words
A current transformer according to claim 1, wherein the rectilinear tubular conductor is cut at its upper end along half of its cross section so that the two enclosures separated inside the tube by the flat conductor open out into the receptacle at different levels where the density of the insulating liquids is different.
Claim 5
Dependent Claim
40 words
A current transformer according to claim 1, wherein the said flat conductor comprises a plurality of insulated conductors grouped in parallel in a bundle, where the said conductors are transposed along their length so as to reduce the skin effect.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |