US2149771A - Electric cable - Google Patents

Electric cable Download PDF

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Publication number
US2149771A
US2149771A US73474A US7347436A US2149771A US 2149771 A US2149771 A US 2149771A US 73474 A US73474 A US 73474A US 7347436 A US7347436 A US 7347436A US 2149771 A US2149771 A US 2149771A
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US
United States
Prior art keywords
layer
tape
conductor
metal
cable
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
US73474A
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English (en)
Inventor
Hunter Philip Vassar
Brazier Leslie Giddens
Hill Harry
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.)
Callenders Cable and Construction Co Ltd
Original Assignee
Callenders Cable and Construction Co Ltd
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 Callenders Cable and Construction Co Ltd filed Critical Callenders Cable and Construction Co Ltd
Application granted granted Critical
Publication of US2149771A publication Critical patent/US2149771A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables

Definitions

  • This invention relates to single core cables havthrough which the surface of the underlying ingaconductor usually, though not necessarily, of brous layer is exposed. It is also necessary to stranded form and a dielectric comprising a lamapply the tape in such a way that its edges do inated body of insulation impregnated with a liqnotproject in a radial direction.
  • Figure 2 is a cross-section of the cable shown 15 complete, non-circular, elastic, metal surface on in Figure 1 taken on plane at right angles to the 15 which the dielectric is subsequently built up in the longitudinal axis of the cable,
  • Figure 3 is a view similar to that of Figure i both inside and outside the layer of metal tape, of a length of cable having a modiiied form of is then impregnatedfby the usual procedures. core construction,
  • Figure 4 is a cross-section of the cable shown 20 convenient points, such as joints and terminain Figure 3 taken in a plane at right angles to tions, be electrically connected with the conducthe longitudinal axis of the cable and tor so that there is no electric eld between the Figure 5 shows a joint between the conductors two.
  • the conductor Ahelix of non-circular cross-section of resilient I is of elliptical crosssection and oi stranded metal tape may be placed inside the smoothing form.
  • the 185781 0f paper 0I Other SOft Abl'OllS material.
  • conductor is directly enclosed in a. soft fibrous This is lapped on the conductor either directly or layer 2 of small thickness. This layer is built 3o with an intervening layer of soft fibrous material.
  • the resilient metal tape is not a stance, tapes of 5 mils thickness, applied helically close lit on the conductor or on the soft fibrous in any convenient manner.
  • the radial thickmaterial but there is a small clearance so that ness of the layer will naturally depend to some ex the tape is free 'to yield inwardly.
  • This resilient tent upon the sizeand form of the strand Over 35 tape forms a spring support for a few layers of this foundation layer is applied a metallic covpaper or other soft fibrous material over which ering 3 consisting of two layers of metal tape each the smooth lapping of metal tape is applied.
  • the layer is such layer coincides with the central region of the tape that it has the effect of smoothing out the surin the other layer.
  • These tapes are smooth sur- ⁇ face irregularities due to the Wires in the strand faced bronze tapes of 3 mils thickness and about forming the conductoror to other causes so that 200 millimetres width.
  • Naturally tapes of other the outer surface of the layer has a smooth consizes and material may be used providing they 45 tour of regularl form.
  • the metal tape applied have a smooth surface and are sufficiently thin over the fibrous smoothing layer thus provides a to be ilexible; for instance, copper tape of about metallic layer having a smooth regular contour 3 mils thickness may be used.
  • the metal without undulations corresponding to the posilayer may comprise more than two tapes or it tions of the wires at the surface of the strand. may consist of a single tape only.
  • This stretching should of course be proportionate to the increase in periphery produced by the application of a thickness of the tape to the underlying layer.
  • the stretching is preferably carried out as the tape is being applied in position round the conductor.
  • the metal, tape should be applied with considerable tension so that the inner surface is in close contact with the underlying material and the overlapping parts of the tape or tapes are also in close contact.
  • a tape 9 which is of bronze and is '7 mils thick and 200 millimetres wide.
  • this tape is not applied so tightly that it lies in contact with the entire surface ofthe strand I but is so applied h as to leave a small clearance I0 on each side of the strand so that it may constitute a resilient base for the overlying layers 2 and 3 of paper and metal respectively.
  • the resilient tape may be of other suitable metal and be of any suitable thickness, for instance, from 5-10 mils thick.
  • the smoothing layer 2 of paper consists of three layers of tape, each put on with a small gap between adjacent turns andthe adjacent layers being so disposed that the gap of one layer is overlapped to a substantial extent by the tape-of the succeeding layer. It will be appreciated that the thickness of the paper smoothing layer may be reduced owing to the smoothing action of the resilient tape 9. Alternatively, of course, the resilient tape may be applied as an open helix with a gap up to about 50% of the width of the tape. In this case the number of.
  • Figure 5 shows a method of effecting a conductor joint and of uniting the metallic smoothing tapes tothe conductor.
  • 'I'he ends of adjacent lengths of cable are prepared by cutting back priate distances.
  • the metallic tapes forming the surface 3 are then uncoiled and temporarily bent back.
  • 'I'he underlying layer 2 of paper is then cut back to expose the conductor, the wires of the outer layer of which are cut back also.
  • the ends of the inner part of the two conductors are jointed by the aid of a ferrule I2 and soldering.
  • the tapes 3 are then wrapped over the solderedjoint and secured to the conductor and ferrule by soldering metal I3.
  • the thickness of the layer 2 of paper may be increased and/or the thickness of the ferrule I2 may be reduced tomake the thickness of the layer 2 and that of the ferrule correspond.
  • the improved construction gives the wall of dielectric an increase in effective strength of about 50% as compared with a wall of similar thickness applied directly to the stranded conductor.
  • this improvement is due, not only to the smoothing out of the contour of the inner conductive surface to which the whole dielectric is applied, but also to the fact that the conductor, a smoothing layer of small thickness surrounding said conductor and consisting of soft fibrous material, a complete, elastic, smooth surfaced, metal layer of non-circular cross-section enclosing said smoothing layer and consisting of at least one helical lapping of metal tape, impregnatng iluid in the interstices in the structure enclosed by'sai'd metal layer, an impregnated laminated body of insulation built up on said metal layerand an impervious sheath surrounding said laminated body of insulation.
  • a singie core electric cable comprising a ccnductor, a smoothing layerof small thickness surrounding said conductor and consisting of soft fibrous material, a spring supp ⁇ rt of n'ncircular cross-section disposed inside said smoothing layer, a complete, elastic, smooth-surfaced, metal layer of non-circular cross-section enclsing said smoothing layer and consisting of at least one helical lapping of metal tape, impregnating fluid in the interstices in the structure enclosed by sad metal layer, an. impregnated laminated body of insulation built up on said metal layer and an impervious sheath surrounding said laminated body of insulation.
  • a single core electric cable comprising a conductor, a helix of non-circular cross-section of resilient metal tape directly surrounding said conductor with a small clearance between it and the conductor, a smoothing layer of 'small thickness surrounding said helix and consisting of soft fibrous material, a complete, elastic, smoothsurfaced, metal layer of non-circular cross-section enclosing said smoothing layer and consisting of at least one helical lapping of metal tape impregnating fluid in the interstices in the structure enclosed by said metal layer, animpregnated laminated body of insulation built up on said metal layer, and an imprevious sheath surrounding said laminated body of insulation.
  • An electric cable system comprising a single conductor, a smoothing layer of small thickness surrounding said conductor and consisting of soft brous material, a complete, elastic, smoothsurfaced metal layer of non-circular cross-section enclosing said smoothing layer and consisting of at least one helical lapping of metal tape, said layer being electrically connected to said conductor at intervals, impregnating fluid in the interstices in the structure enclosed by said metal layer, an impregnated laminated body of insulation built up on said metal layer, and an impervious sheath Surrounding saidlaminated body of insulation.
  • a single core electric cable comprising a conductor, a smoothing layer of small thickness surrounding said conductor and consisting of soft brous material, impregnating fluid in the interstl'ces in said conductor and in said smoothing layer, a smooth walled, elastic, metal tube of noncircular cross-section which consists of at least one helical lapping of metal tape and which encloses said conductor and said smoothing layer and is responsive to variations in the volume of said impregnating fluid, an impregnated laminated body of insulation built up of said tube, and an impervious sheath surrounding said laminated body of insulation.
  • a single core electric cable comprising a conductor, a smoothing layer of small thickness surrounding said conductor and consisting of soft ibrous material, a complete, elastic, smooth surfaced, metal layer oi eliptical cross-section enclosing said smoothing layer and consisting of at least one helical lapping of metal tape, impregnalting liuid in the nterstices enclosed by said metal layer, an impregnated laminated body of insulation built up on said metal layer, and

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  • Cable Accessories (AREA)
  • Insulated Conductors (AREA)
US73474A 1935-04-16 1936-04-09 Electric cable Expired - Lifetime US2149771A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11700/35A GB454449A (en) 1935-04-16 1935-04-16 Improvements in electric cables

Publications (1)

Publication Number Publication Date
US2149771A true US2149771A (en) 1939-03-07

Family

ID=9991087

Family Applications (1)

Application Number Title Priority Date Filing Date
US73474A Expired - Lifetime US2149771A (en) 1935-04-16 1936-04-09 Electric cable

Country Status (4)

Country Link
US (1) US2149771A (xx)
BE (1) BE415027A (xx)
FR (1) FR804920A (xx)
GB (1) GB454449A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419095A (en) * 1944-04-04 1947-04-15 Okonite Callander Cable Compan Electric cable
US2711439A (en) * 1948-04-13 1955-06-21 Canada Wire & Cable Company Lt Electric cables
US2782248A (en) * 1951-06-01 1957-02-19 Gen Electric Electrical cable structure
US4774382A (en) * 1986-07-16 1988-09-27 Societa' Cavi Pirelli S.P.A. Direct current cable insulation with insulating composition including electronegative gas
US20120234577A1 (en) * 2011-03-16 2012-09-20 Kim Hyun-Woong High frequency power cable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419095A (en) * 1944-04-04 1947-04-15 Okonite Callander Cable Compan Electric cable
US2711439A (en) * 1948-04-13 1955-06-21 Canada Wire & Cable Company Lt Electric cables
US2782248A (en) * 1951-06-01 1957-02-19 Gen Electric Electrical cable structure
US4774382A (en) * 1986-07-16 1988-09-27 Societa' Cavi Pirelli S.P.A. Direct current cable insulation with insulating composition including electronegative gas
US20120234577A1 (en) * 2011-03-16 2012-09-20 Kim Hyun-Woong High frequency power cable

Also Published As

Publication number Publication date
BE415027A (xx)
FR804920A (fr) 1936-11-05
GB454449A (en) 1936-10-01

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