US4276102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for compacting transposed cable strands
Assignee: General Electric Co
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Filing: 1980-04-30
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Granted: 1981-06-30
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Expires: 2000-04-30
Abstract
Abstract A heat shrinkable polymeric material is wrapped around a plurality of adhesive coated wire strands placed together in a transposed configuration prior to heating the strands to cause the adhesive to melt and cure. The shrink initiation temperature of the polymeric material is selected to exceed the temperature at which the adhesive melts while preceeding the temperature at which the latent catalyst initiates the cure cycle. The shrinking of the polymeric wrapping causes the transposed cable strands to become compacted and substantially increases the surface area of the strands in contact with the adhesive material.
Inventors
- 👤 Friedrich K. Schaeffer
- 👤 Thomas F. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:29
CPC Classifications
B; B32; B32B; B32B37/00; B29; B29C; B29C61/00; B29C61/006; H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/122; H01F27/00; H01F27/28; H01F27/2823; H01F2027/2838; Y; Y10; Y10S; Y10S174/00; Y10S174/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A method for compacting strands in transposed cables for use within transformers comprising the steps of: providing a plurality of adhesive coated insulated wire strands in close proximity with each other in a transposed cable configuration; wrapping a layer of heat shrinkable polymeric material around said cable in a gapped configuration to contain said strands in close proximity with each other and to allow for the egress of gaseous material and the impregnation of insulating oil through said gaps; arranging said wrapped transposed cable around a winding cylinder to form a transformer winding; evacuating said transformer winding; heating said transformer winding to a first temperature to cause said adhesive to melt; and heating said transformer winding to a second temperature to cause said polymeric material to shrink and to compact said strands.
Claim 2
Independent Claim
132 words
A method for compacting strands in transposed cables for use within transformers comprising the steps of: providing a plurality of adhesive coated insulated wire strands in close proximity with each other in a transposed cable configuration; wrapping a layer of heat shrinkable polymeric material around said cable in a gapped configuration to contain said strands in close proximity with each other and to allow for the egress of gaseous material and the impregnation of insulating oil through said gaps; arranging said wrapped transposed cable around a winding cylinder to form a transformer winding; evacuating said transformer winding; heating said transformer winding to a first temperature to cause said adhesive to melt; and heating said transformer winding to a second temperature to cause said polymeric material to shrink and to compact said strands.
Claim 3
Dependent Claim
25 words
The method of claim 1 including the step of heating said transformer winding to a third temperature to cause said adhesive material to become cured.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein said second temperature is lower than said third temperature and higher than said first temperature.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said polymeric material comprises a thermoplastic polyester.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein said polymeric material contains a plurality of microperferations for providing further egress means for said gaseous material.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein said first temperature comprises at least 70° C. and wherein said second temperature comprises at least 90° C.
Claim 8
Dependent Claim
14 words
The method of claim 6 wherein said third temperature comprises at least 100° C.
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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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |