US3828115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
Assignee: Hubbell Inc
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Filing: 1973-07-27
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Granted: 1974-08-06
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Expires: 1993-07-27
Abstract
Abstract The number of voids in the insulation of high voltage cable is significantly reduced by utilizing a multiple layer construction and therefore, the dielectric strength thereof is optimized by minimizing ionization therein. A field refraction barrier is disposed within the insulation to relax the electrical stress concentrations which would otherwise be encountered due to surface impurities at the interfacial boundries of the multiple layer construction. In cables having an electric shield coaxially arranged about a load conductor, this field refraction barrier disperses the voltage gradient therebetween at terminations and splices and therefore, stress relief cones can be omitted therefrom in many instances.
Inventors
- 👤 A Hvizd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:18
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/02; H02G15/06; H02G15/064; H02G15/072; H01; H01B; H01B7/00; H01B7/02; H01B7/0291; H01B9/00; H01B9/02; H01B9/027; H02G15/08; H02G15/18; H02G15/184
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
The high voltage cable of claim 1 wherein a metallic shield of high electrical conductivity is disposed coaxially about said core and peripherally about said insulation, each said refraction barrier being effective to disperse voltage gradients between said core and said shield at terminations and splices of said cable.
Claim 2
Dependent Claim
49 words
The high voltage cable of claim 2 wherein a terminal lug is applied thereto, said shield and said insulation being removed from a portion of said core and said terminal lug being affixed thereto, said shield being removed from said insulation for a distance back from said terminal lug.
Claim 3
Dependent Claim
44 words
The high voltage cable of claim 2 wherein a splicing lug is applied therein, said splicing lug joining discontinuous ends of said core and establishing electrical continuity therebetween, said shield including means for establishing electrical continuity around said splicing lug at a distance therefrom.
Claim 4
Dependent Claim
27 words
The high voltage cable of claim 2 wherein layers of high specific inductive capacity material are disposed to separate said insulation from said core and said shield.
Claim 5
Dependent Claim
24 words
The high voltage cable of claim 2 wherein layers of semi-conductive material are disposed to separate said insulation from said core and said shield.
Claim 6
Dependent Claim
34 words
The high voltage cable of claim 1 wherein each said layer of low specific inductive capacity material is at least 5 times the thickness of each said layer of high specific inductive capacity material.
Claim 7
Dependent Claim
47 words
The high voltage of claim 7 wherein a metallic shield of high electrical conductivity is disposed coaxially about said core and peripherally about saiD insulation said refraction barrier being effective to disperse voltage gradients between said core and said shield at terminations and splices of said cable.
Claim 8
Dependent Claim
27 words
The high voltage cable of claim 8 wherein layers of high specific inductive capacity material are disposed to separate said insulation from said core and said shield.
Claim 9
Dependent Claim
24 words
The high voltage cable of claim 8 wherein layers of semi-conductive material are disposed to separate said insulation from said core and said shield.
References Cited (Backward Citations)
US1458803A
Cited
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Cited
GB349289A
Cited
FR859507A
Cited
US2782248A
Cited
US3160703A
Cited
US3287489A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |