Patent US4224462A successfully refreshed from Google Patents.
US4224462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage, electric submarine cable with insulation of longitudinally varying voltage breakdown strength
Assignee: Pirelli and C SpA
•
Filing: 1979-03-08
•
Granted: 1980-09-23
•
Expires: 1999-03-08
Abstract
Abstract A submarine cable and an electric power line using such cable for transmitting electric power at high voltge from a first point adjacent the surface of a water body to a second point adjacent the surface of a water body, a portion of the cable lying in great water depths where the hydrostatic pressure is high. The cable comprises at least three sections, each section having its insulation dimensioned or selected for operation at the high voltage when subjected to the ambient pressures. The section, or sections, lying at great depths has insulation with a voltage breakdown strength which varies with pressure, the strength increasing with pressure, so that the insulation thereof may be less than would be required if the such sections were to be used under pressures less than those at the great depths.
Inventors
- 👤 Elio Occhini
- 👤 Aldo Morello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:54
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/14; H01B9/00; H01B9/06; H01B9/0611
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
151 words
A submarine cable for transmitting electrical power at a selected high voltage, said cable comprising: a first section of cable with a conductor surrounded by insulation adequate to withstand and operate at said voltage when subjected to a relatively low hydrostatic pressure; a second section of cable with a conductor surrounded by insulation adequate to withstand and operate at said voltage when subjected to a hydrostatic pressure higher than said relatively low hydrostatic pressure but inadequate for operation at said voltage when subjected to a lower hydrostatic pressure, said second section being electrically connected at one end to said first section; and a third section of cable with a conductor surrounded by insulation adequate to withstand and operate at said voltage when said third section is subjected to a hydrostatic pressure lower than said higher hydrostatic pressure, said third section being electrically connected to the opposite end of said second section.
Claim 2
Dependent Claim
151 words
A submarine cable for transmitting electrical power at a selected high voltage, said cable comprising: a first section of cable with a conductor surrounded by insulation adequate to withstand and operate at said voltage when subjected to a relatively low hydrostatic pressure; a second section of cable with a conductor surrounded by insulation adequate to withstand and operate at said voltage when subjected to a hydrostatic pressure higher than said relatively low hydrostatic pressure but inadequate for operation at said voltage when subjected to a lower hydrostatic pressure, said second section being electrically connected at one end to said first section; and a third section of cable with a conductor surrounded by insulation adequate to withstand and operate at said voltage when said third section is subjected to a hydrostatic pressure lower than said higher hydrostatic pressure, said third section being electrically connected to the opposite end of said second section.
Claim 3
Dependent Claim
35 words
A cable as set forth in claim 1 wherein said insulation of said second section comprises paper impregnated with a viscous impregnating compound, said last-mentioned insulation having a dielectric strength which increases with pressure thereon.
Claim 4
Dependent Claim
32 words
A cable as set forth in claim 1 or 2 wherein the insulation of at least one of said first and third sections comprises paper impregnated with a dielectric fluid under pressure.
Claim 5
Dependent Claim
33 words
A cable as set forth in claim 1 or 2 wherein the insulation of at least one of said first and third sections comprises paper impregnated with an impregnating compound under gas pressure.
Claim 6
Dependent Claim
36 words
A cable as set forth in claim 1 wherein the thickness of the insulation of said second section is less than the thickness of the insulation of at least one of said first and third sections.
Claim 7
Dependent Claim
19 words
A cable as set forth in claim 1 wherein said conductor of said second section is elliptical in cross-section.
Claim 8
Dependent Claim
201 words
A submarine cable line for transmitting electric power at a selected high voltage, said line extending from a first point adjacent the surface of a water body to a second point adjacent the surface of said water body and intermediate said first point and said second point, through a deep water zone, whereby the pressure to which said cable is subjected varies along the length of said cable, said cable comprising: a first section of cable with a conductor surrounded by insulation and extending from said first point to said zone, a second section of cable with a conductor surrounded by insulation and extending from said first section through said zone, said second section being electrically connected at one end to said first section; and a third section of cable with a conductor surrounded by insulation and extending from said second section to said second point, said third section being electrically connected to the opposite end of said second section, said insulation of each said section being adequate to withstand and operate at said voltage when subjected to the hydrostatic pressures thereon but said insulation of said second section being inadequate for operation at said voltage when subjected to atmospheric pressure.
Claim 9
Dependent Claim
201 words
A submarine cable line for transmitting electric power at a selected high voltage, said line extending from a first point adjacent the surface of a water body to a second point adjacent the surface of said water body and intermediate said first point and said second point, through a deep water zone, whereby the pressure to which said cable is subjected varies along the length of said cable, said cable comprising: a first section of cable with a conductor surrounded by insulation and extending from said first point to said zone, a second section of cable with a conductor surrounded by insulation and extending from said first section through said zone, said second section being electrically connected at one end to said first section; and a third section of cable with a conductor surrounded by insulation and extending from said second section to said second point, said third section being electrically connected to the opposite end of said second section, said insulation of each said section being adequate to withstand and operate at said voltage when subjected to the hydrostatic pressures thereon but said insulation of said second section being inadequate for operation at said voltage when subjected to atmospheric pressure.
Claim 10
Dependent Claim
37 words
A line as set forth in claim 7 wherein said insulation of said second section is inadequate for operation at said voltage when subjected to a pressure intermediate atmospheric pressure and the hydrostatic pressure in said zone.
Claim 11
Dependent Claim
37 words
A line as set forth in claim 7 or 8 wherein said insulation of said second section comprises paper impregnated with a viscous impregnating compound said last-mentioned insulation having a dielectric strength which increases with pressure thereon.
Claim 12
Dependent Claim
30 words
A line as set forth in claim 7 wherein the insulation of at least one of said first and third sections comprises paper impregnated with a dielectric fluid under pressure.
Claim 13
Dependent Claim
31 words
A line as set forth in claim 7 wherein the insulation of at least one of said first and third sections comprises paper impregnated with an impregnating compound under gas pressure.
Claim 14
Dependent Claim
36 words
A line as set forth in claim 7 wherein the thickness of the insulation of said second section is less than the thickness of the insulation of at least one of said first and third sections.
References Cited (Backward Citations)
US4132084A
Cited
US4118593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |