US3829603A - Power cable with grounding conductors - Google Patents

Power cable with grounding conductors Download PDF

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Publication number
US3829603A
US3829603A US00354813A US35481373A US3829603A US 3829603 A US3829603 A US 3829603A US 00354813 A US00354813 A US 00354813A US 35481373 A US35481373 A US 35481373A US 3829603 A US3829603 A US 3829603A
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Prior art keywords
conductors
grounding
cable
strands
interstices
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US00354813A
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T Hansen
T Moran
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ANACONDA ACQUISITION Co
Ericsson Inc
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Anaconda Co
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Assigned to ANACONDA-ERICSSON INC., A CORP. OF reassignment ANACONDA-ERICSSON INC., A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ANACONDA COMPANY, THE A CORP. OF DE
Assigned to ANACONDA ACQUISITION CO. reassignment ANACONDA ACQUISITION CO. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ERICSSON, INC., A CORP OF DE
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/025—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of helicoidally wound wire-conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/028—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients with screen grounding means, e.g. drain wires

Definitions

  • a grounding conductor in an interstice may open at one or more points, and still function to carry grounding current.
  • all the grounding conductors may be open at some points without ungrounding the present cable which comprises a plurality, such as but not limited to, three, of insulated power current conductors, stranded together; a plurality of strands of resilient filler material, which may comprise outwardly facing grooves, laid in interstices between the insulated conductors; and a plurality of uninsulated grounding conductors laid in the interstices over the strands. These are supported in the grooves when the strands comprise grooves.
  • Our cable also comprises at least one uninsulated grounding wire wound helically around the insulated and the grounding conductors which latter are urged outwardly by the filler strands against the grounding wire, and an abrasion-resistant jacket surrounding the grounding wire.
  • FIG. 1 shows a section of a cable of our invention.
  • FIG. 2 shows a partial section of the cable of FIG. 1 comprising an alternative filler strand.
  • the cable has 3 flexible-stranded 4/0 Awg tinned-copper conductors 11, 12, 13 with respective 80-mil walls of insulation 14, 15, 16 to comprise insulated power current conductors designated 17, 18, 19.
  • the insulated conductors 17-19 are triplexed together with a left hand lay providing interstices 21, 22, 23 and a central opening 24 containing an insulated ground check strand 26.
  • resilient filler strands 27, 28, 29 which are conveniently formed by extruding rods of neoprene or rubber.
  • Other materials such as twisted fibers can be used for the strands 27-29 so long as they have sufficient nerve or resiliency to continue to recover from compression for indefinite periods of time.
  • Pasty materials or materials that are plastic in the sense that they are subject to permanent compressive deformation are not suitable for the strands '27-29.
  • Over the strands 27-29 within the interstices 21-23 we have laid three 3 Awg grounding conductors 31, 32, 33 stranded from tinned copper wires.
  • the size of the strands 27-29 is selected sufficiently large to project the surfaces of the conductors 31-33 radially outwardly of the circle inscribing the conductors 17-19.
  • the illustrated cable It is constructed to have a cylindrical outer surface. Where circularity of the cable section is not required it is at least necessary that the surfaces of the conductors 31-33 project beyond the tangent lines connecting the surfaces of the insulated conductors so that these surfaces will be urged against any wrappings that are applied around the assembled conductors. Where, as in the present cable 10, it is desired to produce a cylindrical cable, additional filler material, not necessarily resilient, may be added such as filler strands 34.
  • a grounding wire 36 is helically wrapped over the insulated conductors 17-19 and grounding conductors 31-33 making permanent electrical contact with the latter.
  • the wire 36 is one of seven 28 Awg wires wound in parallel with a right hand lay. It might, however, within the scope of our invention be comprised in a braided tape, or take the form of a flat wire of substantial width.
  • the essential feature of the wires 36 is that they comprise a large plurality of electrically conducting members connecting the conductors 31-33 circumferentially at many points along the cable 10.
  • a resilient filler strand 42 has been extruded in a shape providing a lengthwise groove 43 to support the grounding conductor 31.
  • the strand 42 has a restricted section 44 that nests into the base of the interstice 21 and comprises more positive means of securing the continued proper positioning of the grounding conductor against the grounding wires 36.
  • the number of strands 42 used in any cable will equal the number of interstices bearing grounding conductors.
  • the grounding wires 36 In the manufacture of the cable 10 it is economical to apply the grounding wires 36 with the same length of lay and in the same operation as that for the application of the tape 37 and, indeed, the wires 36 may first have been bonded against the underside of the binder tape.
  • a power cable comprising:
  • grounding conductors is three.

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  • Insulated Conductors (AREA)

Abstract

A power cable with uninsulated grounding conductors in the interstices between the insulated conductors has a helical winding of grounding wires. The grounding conductors are urged into contact with the helical wires by beddings of resilient filler material.

Description

United States Patent 1191 Hansen et a1. Aug. 13, 1974 [54] POWER CABLE WHTH GROUNDING 2,258,687 10/1941 Peterson 174/115 CQNDUCTQRS 3,614,300 10/1971 Wilson 174/115 3,644,659 2/1972 Campbell 174/116 X Inventors: Theodore Hansen; Thomas 3,707,595 12/1972 Plate 174/115 Moran, both of Marion, lnd. OTHER PUBLICATIONS [73] Asslgneel The Anaconda Company New G. Kardos, Development of Plastics Cables in Hun- York gary, Electrical Times, Vol. 161, No. 5, Feb. 3, 1972 [22 Filed: Apr. 26, 1973 1 1 PP NOJ 354,813 Primary Examiner-Arthur T. Grimley Attorney, Agent, or FirmVictor F. Volk [52] US. Cl 174/115, 174/36, 174/116 [51] lint. C1. 1101b 7/18, HOlb 9/02 ABSTRACT [58] Field of Search 174/ 1 15, 1 16, 1 13 R, 36, A power cable with uninsulated grounding conductors 174/ 102 R, 105 R, 106 R in the interstices between the insulated conductors has a helical winding of grounding wires. The grounding [56] References Cited conductors are urged into contact with the helical UNITED STATES PATENTS wires by beddings of resilient filler material.
1,904,472 4/1933 Kent 174/1 16 X 6 Claims, 2 Drawing Figures POWER CABLEWITH GROUNDING CONDUCTORS BACKGROUND OF THE INVENTION In electric cables with grounding conductors it has been known to fit the grounding conductors into the interstices of the insulated conductors when the cable is stranded. Such a construction is disclosed for a mining machine cable in Hansen and Wilson US. Pat. No. 3,699,238 wherein the spaces of the interstices over the grounding conductor are rounded out with neoprene filler. When one of these grounding conductors opens at some point, and this eventually happens in cables that are subjected to repeated severe flexing, it no longer shares the load of any grounding current, and, of course, when all the grounding conductors have opened, the cable is no longer grounded.
SUMMARY We have invented a cable, and particularly a flexible cable wherein a grounding conductor in an interstice may open at one or more points, and still function to carry grounding current. In fact, all the grounding conductors may be open at some points without ungrounding the present cable which comprises a plurality, such as but not limited to, three, of insulated power current conductors, stranded together; a plurality of strands of resilient filler material, which may comprise outwardly facing grooves, laid in interstices between the insulated conductors; and a plurality of uninsulated grounding conductors laid in the interstices over the strands. These are supported in the grooves when the strands comprise grooves. Our cable also comprises at least one uninsulated grounding wire wound helically around the insulated and the grounding conductors which latter are urged outwardly by the filler strands against the grounding wire, and an abrasion-resistant jacket surrounding the grounding wire.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 shows a section of a cable of our invention. FIG. 2 shows a partial section of the cable of FIG. 1 comprising an alternative filler strand.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT A cable, indicated generally by the numeral 10, shown in FIG. 1, applies the improvement of our invention to the flexible mining machine cable disclosed in US. Pat. No. 3,699,238, incorporated herein by reference. The cable has 3 flexible-stranded 4/0 Awg tinned-copper conductors 11, 12, 13 with respective 80-mil walls of insulation 14, 15, 16 to comprise insulated power current conductors designated 17, 18, 19. The insulated conductors 17-19 are triplexed together with a left hand lay providing interstices 21, 22, 23 and a central opening 24 containing an insulated ground check strand 26. At the base of the interstices 21-23 we have laid resilient filler strands 27, 28, 29 which are conveniently formed by extruding rods of neoprene or rubber. Other materials such as twisted fibers can be used for the strands 27-29 so long as they have sufficient nerve or resiliency to continue to recover from compression for indefinite periods of time. Pasty materials or materials that are plastic in the sense that they are subject to permanent compressive deformation are not suitable for the strands '27-29. Over the strands 27-29 within the interstices 21-23 we have laid three 3 Awg grounding conductors 31, 32, 33 stranded from tinned copper wires. The size of the strands 27-29 is selected sufficiently large to project the surfaces of the conductors 31-33 radially outwardly of the circle inscribing the conductors 17-19. The illustrated cable It) is constructed to have a cylindrical outer surface. Where circularity of the cable section is not required it is at least necessary that the surfaces of the conductors 31-33 project beyond the tangent lines connecting the surfaces of the insulated conductors so that these surfaces will be urged against any wrappings that are applied around the assembled conductors. Where, as in the present cable 10, it is desired to produce a cylindrical cable, additional filler material, not necessarily resilient, may be added such as filler strands 34.
A grounding wire 36 is helically wrapped over the insulated conductors 17-19 and grounding conductors 31-33 making permanent electrical contact with the latter.
The act of wrapping the wire 36, or a plurality of such wires, compresses the adially projecting grounding conductors 31-33 into the esilient filler strands 27-29 hich thereafter maintain a pressure of the grounding conductors against the grounding wire. The wire 36 is one of seven 28 Awg wires wound in parallel with a right hand lay. It might, however, within the scope of our invention be comprised in a braided tape, or take the form of a flat wire of substantial width. The essential feature of the wires 36 is that they comprise a large plurality of electrically conducting members connecting the conductors 31-33 circumferentially at many points along the cable 10.
Over the wires 36 we have wrapped a fiber reinforced conventional binder tape 37 and extruded a neoprene or other abrasion resistant jacket 38. This is surrounded by an open weave nylon seine twine reinforcing web 39 and a second abrasion resistant extrusion 41.
In the embodiment of FIG. 2 a resilient filler strand 42 has been extruded in a shape providing a lengthwise groove 43 to support the grounding conductor 31. The strand 42 has a restricted section 44 that nests into the base of the interstice 21 and comprises more positive means of securing the continued proper positioning of the grounding conductor against the grounding wires 36. The number of strands 42 used in any cable will equal the number of interstices bearing grounding conductors.
In the manufacture of the cable 10 it is economical to apply the grounding wires 36 with the same length of lay and in the same operation as that for the application of the tape 37 and, indeed, the wires 36 may first have been bonded against the underside of the binder tape.
The foregoing description has been exemplary, rather than definitive, of the cable of our invention for which we desire an award of Letters Patent as defined in the appended claims.
We claim:
1. A power cable comprising:
A. a plurality of insulated power current conductors stranded together, interstices being formed between adjacent of said conductors,
B. a plurality of strands of resilient filler material laid in said interstices,
C. a plurality of uninsulated grounding conductors laid in said interstices over said strands,
D. at least one uninsulated grounding wire wound helically around said insulated conductors and said grounding conductors, said grounding conductors 5 being urged outwardly by said strands against and in electrical contact with said grounding wire, E. an abrasion-resistant polymeric jacket surrounding said grounding wire. 2. The cable of claim 1 wherein said plurality of insulated conductors is three.
grounding conductors is three.
l= l l

Claims (6)

1. A power cable comprising: A. a plurality of insulated power current conductors stranded together, interstices being formed between adjacent of said conductors, B. a plurality of strands of resilient filler material laid in said interstices, C. a plurality of uninsulated grounding conductors laid in said interstices over said strands, D. at least one uninsulated grounding wire wound helically around said insulated conductors and said grounding conductors, said grounding conductors being urged outwardly by said strands against and in electrical contact with said grounding wire, E. an abrasion-resistant polymeric jacket surrounding said grounding wire.
2. The cable of claim 1 wherein said plurality of insulated conductors is three.
3. The cable of claim 1 wherein said plurality of grounding conducTors is three.
4. The cable of claim 1 wherein said filler strands define outwardly facing grooves, said grounding conductors being supported in said grooves.
5. The cable of claim 4 wherein said plurality of insulated conductors is three.
6. The cable of claim 4 wherein said plurality of grounding conductors is three.
US00354813A 1973-04-26 1973-04-26 Power cable with grounding conductors Expired - Lifetime US3829603A (en)

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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993860A (en) * 1975-08-18 1976-11-23 Samuel Moore And Company Electrical cable adapted for use on a tractor trailer
US4533790A (en) * 1983-02-16 1985-08-06 Akzona Incorporated Electrical conductor assembly
US4552432A (en) * 1983-04-21 1985-11-12 Cooper Industries, Inc. Hybrid cable
US4588852A (en) * 1984-12-21 1986-05-13 Amp Incorporated Stable impedance ribbon coax cable
US4707569A (en) * 1985-06-03 1987-11-17 Japan Styrene Paper Corporation Multi-conductor cable
US4719319A (en) * 1986-03-11 1988-01-12 Amp Incorporated Spiral configuration ribbon coaxial cable
US4866842A (en) * 1988-09-30 1989-09-19 Amp Incorporated Method of making a shielded cable harness
US4958333A (en) * 1989-01-12 1990-09-18 Southwest Research Institute Shielding for seismic cables
US5110999A (en) * 1990-12-04 1992-05-05 Todd Barbera Audiophile cable transferring power substantially free from phase delays
US5113040A (en) * 1990-02-13 1992-05-12 Siemens Aktiengesellschaft Flexible electrical cable having two stranded conductors
US5218167A (en) * 1986-11-28 1993-06-08 Gasque Jr Samuel N Cable assembly with lightning protection
US5416269A (en) * 1993-11-01 1995-05-16 Raychem Corporation Insulated cable and method of making same
US5834699A (en) * 1996-02-21 1998-11-10 The Whitaker Corporation Cable with spaced helices
US6030346A (en) * 1996-02-21 2000-02-29 The Whitaker Corporation Ultrasound imaging probe assembly
US6117083A (en) * 1996-02-21 2000-09-12 The Whitaker Corporation Ultrasound imaging probe assembly
US7060905B1 (en) * 2001-11-21 2006-06-13 Raytheon Company Electrical cable having an organized signal placement and its preparation
US20080302554A1 (en) * 2007-06-08 2008-12-11 Southwire Company Armored Cable With Integral Support
WO2009069078A3 (en) * 2007-11-30 2009-07-23 Schlumberger Ca Ltd Small-diameter wireline cables and methods of making same
US20090250238A1 (en) * 2008-04-08 2009-10-08 Wpfy, Inc. Metal sheathed cable assembly
US20090250239A1 (en) * 2008-04-07 2009-10-08 Wpfy, Inc. Metal sheathed cable assembly
US20100270054A1 (en) * 2009-04-23 2010-10-28 Hitachi Cable, Ltd. Cable
US7880089B1 (en) 2008-06-13 2011-02-01 Southwire Company Metal-clad cable assembly
EP2453445A2 (en) * 2010-11-10 2012-05-16 Nexans Power and/or telecommunication cable comprising a reinforced ground-check conductor
US20140069682A1 (en) * 2012-09-11 2014-03-13 Apple Inc. Cable structures and systems and methods for making the same
US8907211B2 (en) 2010-10-29 2014-12-09 Jamie M. Fox Power cable with twisted and untwisted wires to reduce ground loop voltages
US20150293314A1 (en) * 2014-04-09 2015-10-15 Molex Incorporated Cable Structure With Improved Clamping Configuration
US9472320B2 (en) 2012-03-16 2016-10-18 Wpfy, Inc. Metal sheathed cable assembly with non-linear bonding/grounding conductor
US20170066392A1 (en) * 2015-09-09 2017-03-09 Yazaki Corporation Wire harness
US20180374607A1 (en) * 2017-06-27 2018-12-27 Halliburton Energy Services, Inc. Power and Communications Cable for Coiled Tubing Operations
US20220336122A1 (en) * 2021-04-15 2022-10-20 Foxconn (Kunshan) Computer Connector Co., Ltd. Cable
US11482349B1 (en) * 2021-05-20 2022-10-25 James Cheng Lee Cable with non-circular ground wires
EP3455099B1 (en) * 2016-05-12 2023-02-15 ALSTOM Transport Technologies Low-electromagnetic radiation electric motor vehicle
US20240071648A1 (en) * 2022-08-23 2024-02-29 Cheng-Hui Huang Integrated Power Supply DC Output Line

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993860A (en) * 1975-08-18 1976-11-23 Samuel Moore And Company Electrical cable adapted for use on a tractor trailer
US4533790A (en) * 1983-02-16 1985-08-06 Akzona Incorporated Electrical conductor assembly
US4552432A (en) * 1983-04-21 1985-11-12 Cooper Industries, Inc. Hybrid cable
US4588852A (en) * 1984-12-21 1986-05-13 Amp Incorporated Stable impedance ribbon coax cable
US4707569A (en) * 1985-06-03 1987-11-17 Japan Styrene Paper Corporation Multi-conductor cable
US4719319A (en) * 1986-03-11 1988-01-12 Amp Incorporated Spiral configuration ribbon coaxial cable
US5218167A (en) * 1986-11-28 1993-06-08 Gasque Jr Samuel N Cable assembly with lightning protection
US4866842A (en) * 1988-09-30 1989-09-19 Amp Incorporated Method of making a shielded cable harness
US4958333A (en) * 1989-01-12 1990-09-18 Southwest Research Institute Shielding for seismic cables
US5113040A (en) * 1990-02-13 1992-05-12 Siemens Aktiengesellschaft Flexible electrical cable having two stranded conductors
US5110999A (en) * 1990-12-04 1992-05-05 Todd Barbera Audiophile cable transferring power substantially free from phase delays
US5416269A (en) * 1993-11-01 1995-05-16 Raychem Corporation Insulated cable and method of making same
US5834699A (en) * 1996-02-21 1998-11-10 The Whitaker Corporation Cable with spaced helices
US6030346A (en) * 1996-02-21 2000-02-29 The Whitaker Corporation Ultrasound imaging probe assembly
US6117083A (en) * 1996-02-21 2000-09-12 The Whitaker Corporation Ultrasound imaging probe assembly
US7060905B1 (en) * 2001-11-21 2006-06-13 Raytheon Company Electrical cable having an organized signal placement and its preparation
US9396838B2 (en) 2007-06-08 2016-07-19 Southwire Company, Llc Armored cable with integral support
US11948707B2 (en) 2007-06-08 2024-04-02 Southwire Company, Llc Armored cable with integral support
US7754969B2 (en) 2007-06-08 2010-07-13 Southwire Company Armored cable with integral support
US20100252299A1 (en) * 2007-06-08 2010-10-07 Southwire Company Armored Cable with Integral Support
US20080302554A1 (en) * 2007-06-08 2008-12-11 Southwire Company Armored Cable With Integral Support
CN101711416B (en) * 2007-06-08 2015-10-14 南方电线有限责任公司 There is the armored cable of integral support
WO2008154116A1 (en) * 2007-06-08 2008-12-18 Southwire Company Armored cable with integral support
US8697996B2 (en) 2007-06-08 2014-04-15 Southwire Company Armored cable with integral support
WO2009069078A3 (en) * 2007-11-30 2009-07-23 Schlumberger Ca Ltd Small-diameter wireline cables and methods of making same
US8658900B2 (en) 2008-04-07 2014-02-25 Wpfy, Inc. Metal sheathed cable assembly
US20090250239A1 (en) * 2008-04-07 2009-10-08 Wpfy, Inc. Metal sheathed cable assembly
US8946549B2 (en) * 2008-04-08 2015-02-03 Wpfy, Inc. Metal sheathed cable assembly
US20090250238A1 (en) * 2008-04-08 2009-10-08 Wpfy, Inc. Metal sheathed cable assembly
US20120073855A1 (en) * 2008-04-08 2012-03-29 Wpfy, Inc. Metal sheathed cable assembly
US8088997B2 (en) * 2008-04-08 2012-01-03 Wpfy, Inc. Metal sheathed cable assembly
US8664532B1 (en) 2008-06-13 2014-03-04 Southwire Company Metal-clad cable assembly
US7880089B1 (en) 2008-06-13 2011-02-01 Southwire Company Metal-clad cable assembly
US20100270054A1 (en) * 2009-04-23 2010-10-28 Hitachi Cable, Ltd. Cable
US9040826B2 (en) * 2009-04-23 2015-05-26 Hitachi Metals, Ltd. Cable
US8907211B2 (en) 2010-10-29 2014-12-09 Jamie M. Fox Power cable with twisted and untwisted wires to reduce ground loop voltages
EP2453445A2 (en) * 2010-11-10 2012-05-16 Nexans Power and/or telecommunication cable comprising a reinforced ground-check conductor
US9472320B2 (en) 2012-03-16 2016-10-18 Wpfy, Inc. Metal sheathed cable assembly with non-linear bonding/grounding conductor
US20140069682A1 (en) * 2012-09-11 2014-03-13 Apple Inc. Cable structures and systems and methods for making the same
US20150293314A1 (en) * 2014-04-09 2015-10-15 Molex Incorporated Cable Structure With Improved Clamping Configuration
US20170066392A1 (en) * 2015-09-09 2017-03-09 Yazaki Corporation Wire harness
US10322685B2 (en) * 2015-09-09 2019-06-18 Yazaki Corporation Wire harness
EP3455099B1 (en) * 2016-05-12 2023-02-15 ALSTOM Transport Technologies Low-electromagnetic radiation electric motor vehicle
US20180374607A1 (en) * 2017-06-27 2018-12-27 Halliburton Energy Services, Inc. Power and Communications Cable for Coiled Tubing Operations
US10971284B2 (en) * 2017-06-27 2021-04-06 Halliburton Energy Services, Inc. Power and communications cable for coiled tubing operations
US11639662B2 (en) 2017-06-27 2023-05-02 Halliburton Energy Services, Inc. Power and communications cable for coiled tubing operations
US20220336122A1 (en) * 2021-04-15 2022-10-20 Foxconn (Kunshan) Computer Connector Co., Ltd. Cable
US11887749B2 (en) * 2021-04-15 2024-01-30 Foxconn (Kunshan) Computer Connector Co., Ltd. Cable
US11482349B1 (en) * 2021-05-20 2022-10-25 James Cheng Lee Cable with non-circular ground wires
US20240071648A1 (en) * 2022-08-23 2024-02-29 Cheng-Hui Huang Integrated Power Supply DC Output Line

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