US3073889A - Electric submarine cables - Google Patents

Electric submarine cables Download PDF

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Publication number
US3073889A
US3073889A US831135A US83113559A US3073889A US 3073889 A US3073889 A US 3073889A US 831135 A US831135 A US 831135A US 83113559 A US83113559 A US 83113559A US 3073889 A US3073889 A US 3073889A
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US
United States
Prior art keywords
core
seam
dielectric
conductor
tape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US831135A
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English (en)
Inventor
Hayden A Moore
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3073889A publication Critical patent/US3073889A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/14—Submarine cables

Definitions

  • a submarine cable of the coaxial conductor type is known in which the central conductor consists of stranded metal wires around which is a copper tape applied in overlapping helical turns. It is also known to apply the copper tape longitudinally with the edges formed into a continuous box seam.
  • the dielectric separating this central conductor from an outer conductor is a solid dielectric such as polythene applied by extrusion.
  • Ditiiculty has arisen in the extrusion process because air in the interstices between the strands expands as a consequence of the heat in the extruder and forms air bubbles in the dielectric.
  • Proposals have been made to fill the interstices between the strands with a suitable dielectric such as a mixture of polythene and polymerised isobutylene.
  • a suitable dielectric such as a mixture of polythene and polymerised isobutylene.
  • ditficulty Apart from ditficulty in controlling the diameter of the conductor there has been trouble with bursting of the sealed copper tube at the seam. There is also some danger of increasing the A.C. resistance of the conductor with this method.
  • copper tape is wrapped longitudinally around the stranded centre member and the seam of the tape is hermetically sealed.
  • FIG. 1 is a cross-section of a core of a Submarine cable according to the invention and FIG. 2 is a perspective view showing a method of making such core.
  • FIG. 1 shows a cross section of a core of a Submarine cable.
  • This core consists of a strand 1 of metal wires surrounded in known manner by a copper tape 2 folded longitudinally about the strand 1 with the meeting edges formed into a box seam 3.
  • the meeting edges of the box seam 3 are sealed by means of a filament 4 of plastic material, which is illustrated as being an organic thermoplastic material such as polythene which has been heated to cause it to ow between the meeting edges of the box seam and so seal the seam.
  • FIG. 2 One method of applying a filament of polythene is shown in FIG. 2.
  • the polythene filament 4 is led through a tube 5 so that it is applied immediately under the meeting edges of the copper tape 2 as the box seam 3 is formed.
  • the method of folding the copper tape longitudinally and forming a box seam is well known and need not therefore be described.
  • the core shown in the drawings was formed with a strand *1 of 19 mild steel wires and the polythene filament 4 was 0.03 inch in diameter.
  • This core formed the inner conductor of a Submarine coaxial cable and a dielectric of polyethylene 6 was extruded around this core and enclosed in a conductor 7.
  • the core was heated in the usual manner at the entry to the extrusion machine by means of gas flames and the heat so applied caused the polyethylene of the filament 4 to flow between the meeting edges of the box seam and between the conductors adjacent to the box seam and the copper tape 2 thus hermetically sealing the metal strands within the copper tape.
  • the heat sealing of the box seam could be eii'ected by any convenient form of heating such as high frequency induction heating of the copper tube or D.C. resistance heating through a contact roller. It is also clear that the heating could be carried out immediately after the seam is formed or during the formation of the seam.
  • the filament 4 has been described as being of an organic thermoplastic material it could equally be a plastic metal such as lead which would flow under the heat applied.
  • a core In an electric cable, a core, a metal tape folded longitudinally of itself as a sheath about the core with the lateral edges of the tape formed into a box seam, a length of plastic material disposed inside said sheath and contiguous with the core and said box seam to provide a seal for said seam, a solid dielectric surrounding the seamed metal tape and an outer conductor surrounding the dielectric.
  • Electric cable as claimed in claim 1 in which the said length of plastic material is a filament of thermoplastic organic material.

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Insulated Conductors (AREA)
US831135A 1958-08-15 1959-08-03 Electric submarine cables Expired - Lifetime US3073889A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26293/58A GB863436A (en) 1958-08-15 1958-08-15 Improvements in or relating to electric submarine cables

Publications (1)

Publication Number Publication Date
US3073889A true US3073889A (en) 1963-01-15

Family

ID=10241346

Family Applications (1)

Application Number Title Priority Date Filing Date
US831135A Expired - Lifetime US3073889A (en) 1958-08-15 1959-08-03 Electric submarine cables

Country Status (4)

Country Link
US (1) US3073889A (fr)
BE (1) BE581649A (fr)
FR (1) FR1242916A (fr)
GB (1) GB863436A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206541A (en) * 1963-04-29 1965-09-14 Gen Cable Corp Sheathed electrical cable
US3649745A (en) * 1970-08-14 1972-03-14 Anaconda Wire & Cable Co Sodium conductor cable
US5451718A (en) * 1993-04-08 1995-09-19 Southwire Company Mechanically bonded metal sheath for power cable
WO2006021757A1 (fr) * 2004-08-21 2006-03-02 Ventcroft Limited Câble ignifuge et procédé de fabrication

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH83383A (de) * 1919-05-14 1919-12-01 Bruederlin F Wilhelm Neuerung an gefalzten Metallrohren zur Umhüllung elektrischer Leitungen
US2492568A (en) * 1947-01-28 1949-12-27 Western Electric Co Electrical conductor cables and a method of making cables
US2711439A (en) * 1948-04-13 1955-06-21 Canada Wire & Cable Company Lt Electric cables

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH83383A (de) * 1919-05-14 1919-12-01 Bruederlin F Wilhelm Neuerung an gefalzten Metallrohren zur Umhüllung elektrischer Leitungen
US2492568A (en) * 1947-01-28 1949-12-27 Western Electric Co Electrical conductor cables and a method of making cables
US2711439A (en) * 1948-04-13 1955-06-21 Canada Wire & Cable Company Lt Electric cables

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206541A (en) * 1963-04-29 1965-09-14 Gen Cable Corp Sheathed electrical cable
US3649745A (en) * 1970-08-14 1972-03-14 Anaconda Wire & Cable Co Sodium conductor cable
US5451718A (en) * 1993-04-08 1995-09-19 Southwire Company Mechanically bonded metal sheath for power cable
WO2006021757A1 (fr) * 2004-08-21 2006-03-02 Ventcroft Limited Câble ignifuge et procédé de fabrication

Also Published As

Publication number Publication date
FR1242916A (fr) 1960-10-07
GB863436A (en) 1961-03-22
BE581649A (fr) 1960-02-15

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