US3794752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage cable system free from metallic shielding
Assignee: ANACONDA ACQUISITION Co
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Filing: 1973-05-30
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Granted: 1974-02-26
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Expires: 1993-05-30
Abstract
Abstract An electric cable for service above 2000 volts does not include metallic members in its electrostatic shielding system but depends entirely on a semiconducting polymeric jacket for the electrostatic shield. A parallel neutral grounding conductor, held in lengthwise electrical contact with the jacket, drains any electrostatic current and provides ample path for the return current in the event of a fault.
Inventors
- 👤 S Bunish
- 👤 C Landinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:33
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B9/028; H01B9/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
An electric cable system comprising, A a first elongated member comprising, a. a metallic power conductor, b. a layer of semiconducting polymeric strand shielding directly surrounding said conductor, c. a heavy wall of electrical insulation directly surrounding said layer, d. a semiconducting jacket of polymeric electrostatic insulation shielding, free from continuous lengths of metal, directly surrounding said wall, said jacket comprisng an outer surface defining the outermost portion of said first member, and said jacket comprising a uniform, homogeneous thickness between said wall and said surface, B. a second elongated member comprising, a. a grounded metal neutral conductor, b. a semiconducting jacket of polymeric composition directly surrounding Said neutral conductor, c. said second member being in substantially continuous lengthwise proximity to said surface whereby a fault through said insulation may bridge an ionized path to said neutral conductor and be returned to ground.
Claim 2
Dependent Claim
143 words
An electric cable system comprising, A a first elongated member comprising, a. a metallic power conductor, b. a layer of semiconducting polymeric strand shielding directly surrounding said conductor, c. a heavy wall of electrical insulation directly surrounding said layer, d. a semiconducting jacket of polymeric electrostatic insulation shielding, free from continuous lengths of metal, directly surrounding said wall, said jacket comprisng an outer surface defining the outermost portion of said first member, and said jacket comprising a uniform, homogeneous thickness between said wall and said surface, B. a second elongated member comprising, a. a grounded metal neutral conductor, b. a semiconducting jacket of polymeric composition directly surrounding Said neutral conductor, c. said second member being in substantially continuous lengthwise proximity to said surface whereby a fault through said insulation may bridge an ionized path to said neutral conductor and be returned to ground.
Claim 3
Dependent Claim
13 words
The system of claim 1 wherein said first and second members are inter-stranded.
Claim 4
Dependent Claim
13 words
The system of claim 1 wherein said semiconducting layers are continuous in section.
Claim 5
Dependent Claim
137 words
An electric cable comprising, A. three elongated members helically stranded together, each of said members comprising, a. a metallic power conductor, b. a layer of semiconducting strand shielding directly surrounding said conductor, c. a heavy wall of electrical insulation directly surrounding said layer, and d. a metal free semiconducting jacket of polymeric electrostatic insulation shielding directly surrounding said wall, said jacket comprising an outer surface defining the outermost portion of said member, and said jacket comprising a uniform, homogeneous thickness between said wall and said surface, B. a metallic neutral conductor laid centrally of said members, and in continuous lengthwise electrical contact with three of said surfaces, whereby a fault exceeding the current carrying capacity of said jackets will bridge an ionized path to said neutral conductor and be returned to ground, said neutral conductor being grounded.
Claim 6
Dependent Claim
137 words
An electric cable comprising, A. three elongated members helically stranded together, each of said members comprising, a. a metallic power conductor, b. a layer of semiconducting strand shielding directly surrounding said conductor, c. a heavy wall of electrical insulation directly surrounding said layer, and d. a metal free semiconducting jacket of polymeric electrostatic insulation shielding directly surrounding said wall, said jacket comprising an outer surface defining the outermost portion of said member, and said jacket comprising a uniform, homogeneous thickness between said wall and said surface, B. a metallic neutral conductor laid centrally of said members, and in continuous lengthwise electrical contact with three of said surfaces, whereby a fault exceeding the current carrying capacity of said jackets will bridge an ionized path to said neutral conductor and be returned to ground, said neutral conductor being grounded.
Claim 7
Dependent Claim
17 words
The cable of claim 4 comprising a semiconducting jacket of polymeric composition directly surrounding said neutral conductor.
References Cited (Backward Citations)
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |