US3720897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical inductive apparatus
Assignee: ABB Inc USA
•
Filing: 1971-08-09
•
Granted: 1973-03-13
•
Expires: 1991-08-09
Abstract
Abstract An arrangement for supporting a winding tube of a power transformer. The winding tube is supported and held in position by a supporting structure constructed of rigid plastic foam. Spaces or openings in the supporting structure, which are created by suitably shaped members, permit the liquid dielectric of the transformer to flow through the supporting structure to cool adjacent structures. The suitably shaped members are inserted between the winding tube and its supporting member before the plastic foam is placed therein, thereby defining the shape of the spaces or openings in the supporting structure.
Inventors
- 👤 L Feather
- 👤 L Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:42
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/30; H01F27/306
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
51 words
A transformer comprising a winding tube having a winding disposed thereon, a mounting member for said winding tube, a supporting structure constructed of a rigid plastic foam disposed between said winding tube and said mounting member, said supporting structure having openings therethrough for providing channels through which liquid dielectric may flow.
Claim 2
Dependent Claim
51 words
A transformer comprising a winding tube having a winding disposed thereon, a mounting member for said winding tube, a supporting structure constructed of a rigid plastic foam disposed between said winding tube and said mounting member, said supporting structure having openings therethrough for providing channels through which liquid dielectric may flow.
Claim 3
Dependent Claim
51 words
A transformer comprising a winding tube having a winding disposed thereon, a mounting member for said winding tube, a supporting structure constructed of a rigid plastic foam disposed between said winding tube and said mounting member, said supporting structure having openings therethrough for providing channels through which liquid dielectric may flow.
Claim 4
Dependent Claim
51 words
A transformer comprising a winding tube having a winding disposed thereon, a mounting member for said winding tube, a supporting structure constructed of a rigid plastic foam disposed between said winding tube and said mounting member, said supporting structure having openings therethrough for providing channels through which liquid dielectric may flow.
Claim 5
Dependent Claim
16 words
The transformer of claim 1 wherein the mounting member comprises a leg of a magnetic core.
Claim 6
Dependent Claim
18 words
The transformer of claim 1 wherein the mounting member comprises solid insulating material wrapped around a winding structure.
Claim 7
Dependent Claim
21 words
The transformer of claim 1 wherein the rigid plastic foam is selected from the group consisting of epoxides, phenolics and silicones.
Claim 8
Dependent Claim
21 words
The transformer of claim 1 wherein the rigid plastic foam from which the supporting structure is constructed comprises rigid polyurethane foam.
Claim 9
Dependent Claim
15 words
The transformer of claim 1 wherein the openings in the supporting structure are cylindrically shaped.
Claim 10
Dependent Claim
18 words
The transformer of claim 6 wherein the openings in the supporting structure are defined by hollow cylindrical tubes.
Claim 11
Dependent Claim
23 words
The transformer of claim 6 wherein the cylindrically shaped openings are substantially equally spaced at the same radial distance through the supporting structure.
Claim 12
Dependent Claim
21 words
The transformer of claim 6 wherein the cylindrically shaped openings are positioned throughout the supporting structure in a radially staggered pattern.
Claim 13
Dependent Claim
22 words
The transformer of claim 1 wherein the openings in the supporting structure are formed by a corrugated boundary of the supporting structure.
Claim 14
Dependent Claim
19 words
The transformer of claim 10 wherein the corrugated boundary is defined by a boundary layer constructed of insulating material.
Claim 15
Dependent Claim
19 words
The transformer of claim 11 wherein the insulating material from which the boundary layer is constructed comprises paper board.
Claim 16
Dependent Claim
18 words
The transformer of claim 11 wherein a spacer is positioned between said mounting member and said boundary layer.
Claim 17
Dependent Claim
17 words
The transformer of claim 13 wherein the spacer and the boundary layer are constructed of similar materials.
Claim 18
Dependent Claim
22 words
The transformer of claim 13 wherein the spacer is constructed of a material which dissolves in the liquid dielectric of the transformer.
Claim 19
Dependent Claim
13 words
The transformer of claim 13 wherein said spacer is constructed of polyethylene film.
Claim 20
Dependent Claim
12 words
The transformer of claim 13 wherein said spacer is constructed of paper.
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |