Patent US6340794B1 successfully refreshed from Google Patents.
US6340794B1
Expired / Lapsed
US
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Stress control for termination of a high voltage cable
Assignee: 3M Innovative Properties Co
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Filing: 1996-12-16
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Granted: 2002-01-22
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Expires: 2016-12-16
Abstract
Abstract A two-part system for electrical stress control includes a conformable stress control material positioned at the shield cut edge of a prepared power cable and a stress control tube over the conformable stress control material. A second region of conformable stress control material is positioned adjacent the cut end of the insulation. Relationships are revealed which relate the permittivity and dimensional parameters of the two components.
Inventors
- 👤 Robert A. Wandmacher
- 👤 Lawrence C. Chor
- 👤 John T. Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:42
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/02; H02G15/06; H02G15/064; H02G15/068; H02G15/182; H02G15/1826; H02G15/1833; H02G15/184
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A termination for an electrical power cable including an inner conductor, electrical insulation surrounding the conductor and a semi-conductive shield surrounding the insulation, wherein the shield is removed to a predetermined length and the insulation is removed to a lesser predetermined length to expose the conductor, the termination comprising: a first region of relatively high permittivity conformable stress control material in contact with a cut end of the cable shield and extending along the cable insulation; a second region of relatively high permittivity conformable stress control material disposed in contact with a cut end of the cable insulation; and a polymeric electrically insulating layer extending from a first end of the termination to a second end of the termination, the electrically insulating layer disposed over said first and second regions of relatively high permittivity conformable stress control material.
Claim 2
Dependent Claim
138 words
A termination for an electrical power cable including an inner conductor, electrical insulation surrounding the conductor and a semi-conductive shield surrounding the insulation, wherein the shield is removed to a predetermined length and the insulation is removed to a lesser predetermined length to expose the conductor, the termination comprising: a first region of relatively high permittivity conformable stress control material in contact with a cut end of the cable shield and extending along the cable insulation; a second region of relatively high permittivity conformable stress control material disposed in contact with a cut end of the cable insulation; and a polymeric electrically insulating layer extending from a first end of the termination to a second end of the termination, the electrically insulating layer disposed over said first and second regions of relatively high permittivity conformable stress control material.
Claim 3
Dependent Claim
25 words
The termination of claim 1 , further comprising: a polymeric stress control tube extending between said first and second regions of conformable stress control material.
Claim 4
Dependent Claim
23 words
The termination of claim 1 , further comprising: a polymeric stress control tube disposed over said first region of conformable stress control material.
Claim 5
Dependent Claim
23 words
The termination of claim 1 , further comprising: a polymeric stress control tube disposed over said second region of conformable stress control material.
Claim 6
Dependent Claim
20 words
The termination of claim 1 , wherein the first and second regions of conformable stress control material contact each other.
Claim 7
Dependent Claim
22 words
The termination of claim 1 , wherein the permittivity ∈ p of said conformable stress control material is at least about 16.
Claim 8
Dependent Claim
23 words
The termination of claim 1 , wherein the permittivity ∈ p of said conformable stress control material is between about 20 and 50.
Claim 9
Dependent Claim
32 words
The termination of claim 1 , wherein the conformable stress control material is comprised of a blend of epihalohydrin polymers and insulating polymers having an electrical dissipation factor of less than 1.
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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) | 2005-01-21 | 2005-07-23 | 2006-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-01-21 | 2009-07-23 | 2010-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-01-21 | 2013-07-23 | 2014-01-22 | $7700.00 | Window Closed / Lapsed |