US3579162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Winding duct construction for power transformer
Assignee: General Electric Co
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Filing: 1969-11-28
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Granted: 1971-05-18
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Expires: 1989-11-28
Abstract
Abstract The ducts between adjacent layers of windings are formed into a plurality of longitudinal passageways of generally square cross section. A flat strip of insulating material twisted about the central longitudinal axis thereof is provided in each of the passageways to augment the heat flow from the winding to the coolant flowing in the passageway.
Inventors
- 👤 Sudhir D Savkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:42
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; H01F27/10; H01F27/12; H01F27/28; H01F27/32; H01F27/322
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
A forced convection cooling system for a power transformer comprising: a tank containing insulating liquid coolant, a transformer immersed in said coolant, said transformer including a winding, said winding being in the form of a plurality of layers of wire having adjacent layers of said winding spaced to provide a plurality of ducts, each duct extending from one end of the winding to the other end thereof, a radiator system for said coolant having an inlet end connected to said tank adjacent one end of said windings and having an outlet end connected to said tank adjacent the other end of said winding, pumping means connected in the fluid flow circuit including said ducts and said radiator system, and each of said ducts including a plurality of passageways, each passageway including mEans for producing a vortical motion in the fluid flowing through the passageway.
Claim 2
Dependent Claim
144 words
A forced convection cooling system for a power transformer comprising: a tank containing insulating liquid coolant, a transformer immersed in said coolant, said transformer including a winding, said winding being in the form of a plurality of layers of wire having adjacent layers of said winding spaced to provide a plurality of ducts, each duct extending from one end of the winding to the other end thereof, a radiator system for said coolant having an inlet end connected to said tank adjacent one end of said windings and having an outlet end connected to said tank adjacent the other end of said winding, pumping means connected in the fluid flow circuit including said ducts and said radiator system, and each of said ducts including a plurality of passageways, each passageway including mEans for producing a vortical motion in the fluid flowing through the passageway.
Claim 3
Dependent Claim
46 words
The combination of claim 1 in which said vortical motion producing means is a flat strip twisted about the central longitudinal axis thereof, the cylindrical surface representing the locus of the longitudinal edges of said strip encompassing a major portion of the volume of said passageway.
Claim 4
Dependent Claim
20 words
The combination of claim 2 in which each of said strips is essentially tangent to three sides of said passageway.
Claim 5
Dependent Claim
32 words
The combination of claim 2 in which each of said passageways is substantially square in cross section and the width of said stripes being substantially equal to a side of said square.
Claim 6
Dependent Claim
48 words
The combination of claim 2 in which a plurality of insulating spacers extend along the length of said winding in said duct to space one layer of said winding from an adjacent layer, said twisted tape being secured to one of said spacers at points of tangency therewith.
Claim 7
Dependent Claim
13 words
The combination of claim 5 in which said twisted tape is an insulator.
Claim 8
Dependent Claim
72 words
A liquid-cooled power transformer comprising: a winding, said winding being in the form of a plurality of layers of wire having adjacent layers of said winding in spaced relationship to provide a plurality of ducts extending from one end of said winding to the other end thereof, each of said ducts including a plurality of passageways, each passageway including means for producing a vortical motion to the fluid adapted to flow therethrough.
Claim 9
Dependent Claim
72 words
A liquid-cooled power transformer comprising: a winding, said winding being in the form of a plurality of layers of wire having adjacent layers of said winding in spaced relationship to provide a plurality of ducts extending from one end of said winding to the other end thereof, each of said ducts including a plurality of passageways, each passageway including means for producing a vortical motion to the fluid adapted to flow therethrough.
Claim 10
Dependent Claim
24 words
The combination of claim 8 in which said ducts are oval in shape and in which said passageways are substantially square in cross section.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |