US4460885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transformer
Assignee: ABB Inc USA
•
Filing: 1981-07-29
•
Granted: 1984-07-17
•
Expires: 2001-07-29
Abstract
Abstract A power transformer characterized by inner and outer low voltage winding sections and a high voltage winding section disposed therebetween. The low voltage windings are comprised of a plurality of pancake coils, and the high voltage winding are comprised of a plurality of conductor strands spirally wound for a plurality of coil layers. The low and high voltage winding sections are laterally spaced with the low voltage windings disposed in side-by-side positions and adjacent to the high voltage windings. The high voltage windings having a smaller turn height than the low voltage windings and having conductor strands of smaller gauge than the pancake coils of the low voltage windings.
Inventors
- 👤 Irvin L. Hansen
- 👤 Leach S. McCormick
- 👤 Harold R. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2871
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A power transformer comrprising: a laminated magnetic core; low voltage coil groups having a pancake-type winding structure disposed in inductive relationship with said core; a high voltage coil group having a winding structure disposed in inductive relationship with said core and between each pair of low voltage groups; each low voltage coil group including a plurality of said pancake winding structures; and said high voltage coil group including a plurality of coil layers that are successively formed one upon another by winding a strand of an insulated conductor back and forth between the low voltage coil groups.
Claim 2
Dependent Claim
97 words
A power transformer comrprising: a laminated magnetic core; low voltage coil groups having a pancake-type winding structure disposed in inductive relationship with said core; a high voltage coil group having a winding structure disposed in inductive relationship with said core and between each pair of low voltage groups; each low voltage coil group including a plurality of said pancake winding structures; and said high voltage coil group including a plurality of coil layers that are successively formed one upon another by winding a strand of an insulated conductor back and forth between the low voltage coil groups.
Claim 3
Dependent Claim
19 words
The device of claim 1 in which said conductor has a gauge smaller than that of the pancake coils.
References Cited (Backward Citations)
US716206A
Cited
US2878455A
Cited
FR1198126A
Cited
US3153216A
Cited
US3688233A
Cited
US3939449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |