Patent US6015629A successfully refreshed from Google Patents.
US6015629A
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Stress control for termination of a high voltage cable
Assignee: 3M Innovative Properties Co
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Filing: 1998-09-04
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Granted: 2000-01-18
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Expires: 2018-09-04
Abstract
Abstract A two-part system for electrical stress control includes a non-tacky conformable stress control material that is positioned at the shield cut edge of a prepared power cable and a stress control tube over the non-tacky conformable stress control material. A second region of conformable stress control material is positioned adjacent the cut end of the insulation.
Inventors
- 👤 Thomas J. D. Heyer
- 👤 Robert A. Wandmacher
- 👤 Lawrence C. Chor
- 👤 John T. Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:05
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C; C08; C08L; C08L71/00; C08L71/02; C08L71/03; C08L83/00; C08L83/04; H01B3/42; H01B3/427; H02; H02G; H02G15/00; H02G15/02; H02G15/06; H02G15/064; H02G15/068; C08G; C08G77/00; C08G77/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12562
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
219 words
An elastically recoverable 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 non-tacky conformable stress control material for contact with a cut end of the cable shield and extending along the cable insulation; a second region of non-tacky conformable stress control material to be disposed in contact with a cut end of the cable insulation; and a polymeric electrically insulating layer extending the entire length 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 stress control material; wherein the non-tacky stress control material comprises a) 100 parts of a resin component containing 1) from 20% to 80% of an epihalohydrin polymer, and 2) correspondingly, from 80% to 20% of an insulating silicone polymer having a tan δ of less than one, b) from 10 to 200 parts of a filler, said filler being nonconductive at room temperature, selected from the group consisting of barium titanate and hydrated aluminum silicate, and c) from 0 to 30 parts of a plasticizer.
Claim 2
Dependent Claim
219 words
An elastically recoverable 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 non-tacky conformable stress control material for contact with a cut end of the cable shield and extending along the cable insulation; a second region of non-tacky conformable stress control material to be disposed in contact with a cut end of the cable insulation; and a polymeric electrically insulating layer extending the entire length 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 stress control material; wherein the non-tacky stress control material comprises a) 100 parts of a resin component containing 1) from 20% to 80% of an epihalohydrin polymer, and 2) correspondingly, from 80% to 20% of an insulating silicone polymer having a tan δ of less than one, b) from 10 to 200 parts of a filler, said filler being nonconductive at room temperature, selected from the group consisting of barium titanate and hydrated aluminum silicate, and c) from 0 to 30 parts of a plasticizer.
Claim 3
Dependent Claim
24 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
22 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
22 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
19 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 .di-elect cons. 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 .di-elect cons. p of said conformable stress control material is between about 20 and 50.
Claim 9
Dependent Claim
35 words
The termination according to claim 1 wherein said stress control material has a tan δ of less than 4 where said material is tested under electrical stress of at least 3 kV to 20 kV/cm.
References Cited (Backward Citations)
US3515798A
Cited
US3673305A
Cited
US3859576A
Cited
US4470898A
Cited
US4431861A
Cited
US4017652A
Cited
US4017652B1
Cited
US4378463A
Cited
FR2371804A1
Cited
US4203886A
Cited
US4234439A
Cited
US4383131A
Cited
US4265800A
Cited
US4412029A
Cited
US4363842A
Cited
US5010137A
Cited
EP0297414A2
Cited
EP0424090B1
Cited
EP0435554A2
Cited
US5098752A
Cited
US5455383A
Cited
US5804630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-17 | 2003-07-19 | 2004-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-17 | 2007-07-19 | 2008-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-17 | 2011-07-19 | 2012-01-18 | $7700.00 | Window Closed / Lapsed |