US1873798A - Method of and means for suspending and protecting aerial cables - Google Patents

Method of and means for suspending and protecting aerial cables Download PDF

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Publication number
US1873798A
US1873798A US249984A US24998428A US1873798A US 1873798 A US1873798 A US 1873798A US 249984 A US249984 A US 249984A US 24998428 A US24998428 A US 24998428A US 1873798 A US1873798 A US 1873798A
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US
United States
Prior art keywords
cable
conductor
support
point
damper
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
US249984A
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English (en)
Inventor
Varney Theodore
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.)
Howmet Aerospace Inc
Original Assignee
Aluminum Company of America
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
Priority to NL27312D priority Critical patent/NL27312C/xx
Application filed by Aluminum Company of America filed Critical Aluminum Company of America
Priority to US249984A priority patent/US1873798A/en
Application granted granted Critical
Publication of US1873798A publication Critical patent/US1873798A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/14—Arrangements or devices for damping mechanical oscillations of lines, e.g. for reducing production of sound
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S57/00—Textiles: spinning, twisting, and twining
    • Y10S57/906—Line appliances
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/39—Cord and rope holders
    • Y10T24/3916—One-piece
    • Y10T24/392—Wire
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/39—Cord and rope holders
    • Y10T24/3958—Screw clamp
    • Y10T24/3964—J-shaped bolt

Definitions

  • This invention relates to the art of suspending cables, .and particularly to the art of suspending electrical power transmission line conductors, wires, or cables employed in such lines or systems.
  • the present invention contemplates a new and improved method of and means for preventing damage to transmission line conductors, wires, or cables, suspended in the air, due to vibrations set up therein caused by the action of the wind or other disturbances.
  • An important object of the present invention is to provide means at the point of support of such character that injurious bending will be prevented. I have discovered that if the radius of curvature of the wire or conductor at the point of support is prevented from bein any shorter than the radius of curvature 1n the middle of a loop, such breakage will be prevented, and have, therefore, devised a method of and means for accomplishing this end.
  • a vibration damper or stiifening means preferably inoludlng a layer of cylindrical wires, rods, or
  • the vibration damper should preferablyy include wires or other elements capable of being tightly wound on the conductor, so that j they will not slip longitudinally with respect to the cable as the latter is bent.
  • the wires or other elements entering into the construction y of the vibration damper or stifening device sharply reflected at the ends of the vibration damper; to -provide a new and improved mass or damper structure having a central enlarged portion and tapered end portions; and to provide a structure of the character specified formed of individual wires or similar elements of a form to provide a damper having an enlarged non-twisted central portion and twisted tapering end portions adapted to be applied to the conductor line or cable.
  • Another important object of the present invention is to provide a structure of such character that it may be readily applied to the conductor or transmission. line in the field.
  • Fig. l is a diagrammatic view, showing two adjacent vibrating loops as they occur in the span;
  • Fig. 2 a diagrammatic view showing an enlarged View of half of a loop at one of the ⁇ supports of the span;
  • Fig. 3 a fragmentary diagrammatic view, particularly showing a transmission line conductor or cable of the charactery employed, with damper means applied thereto;
  • Fig. 4 a side elevational view, showing my invention applied to an insulator string, showing at one side of the clamp the wires before they are twisted and at the other side of the clamp the finished twisted wires;
  • FIG. 5 an enlarged View of a portion of the damper and support of Fig. 4, showing the clamp broken away;
  • Fig. 6 an elevational similar view, showing a completed damper structure applied to a .pin type insulator
  • Fig. 7 a detail elevational view, showing an individual wire of the character employed in the construction of the damper.
  • Fig. 8 an end elevational view, showing a form of clamp employed at the end of damper structure.
  • R Radius of curvature at middle point of loop.
  • V Vel0city of transverse wave in feet per second.
  • K Moment producing bending at support.
  • Id Moment of inertia of damper at support.
  • M Virtual modulus of elasticity of complete conductor and damper.
  • M3 Modulus of elasticity of steel.
  • Ma Modulus of elasticity of aluminum.
  • Md Modulus of elasticity of damper material.
  • the length l for the small values of Q is so nearly equal to L that the tension of the cable may be assumed constant and equal to P.
  • Q is less than approximately 1/2 degree.
  • a circle of radius (R) is drawn tangent to the axis of (X) as the origin (O)
  • a tangent is' drawn to this circle parallel to (OC). This tangent makes an angle (Q) with ⁇ the axis of The arc OB subtends an angle at the center equal to (Q) and the angle (BOE) equals
  • the arc length (OB) 4 is obtained las follows:
  • (I) must usually be greater than the value corres onding to the wire itself.
  • This Dvalue may e obtamed by a reinforcing wrapping or damper, the proportions of which may be determined from the following expression:
  • the cable as illustrated by Fig. 3, is composed of a steel core and an aluminum envelope.V It is to 'be understood, however, that the-cable may consist entirely of any single metalor material or any combination moment at (O) is yrepresented ⁇ of materials. Also, the damper may consist of an suitable material.
  • Figs. 4 to 8 inclusive designates a portion of a conductor employed for electric powerftransmis- The particular preferred construction of this conductor is illustrated by Fig. 3, and has heretofore been described.
  • 6 designates generally the yvibration damper.
  • the damper structure or device includes a plurality of wires, rods, or other similar cylindrical elements 7, each of the individual wires being of tapered form, or formed with a central non-tapered middle portion 8 of the desired cross sectional area and gradually tapering end portions 9.
  • These elements 7, of sufficient number and diameter are superimposed upon the conductor or cable at or adjacent to its point of support to completely surround it, said elements being arranged about the cable or conuctor, parallel with its axis.
  • a clamp device 10 of any preferred design, is applied to the central portionof lthe elements and brought into binding engagement therewith. As shown. the clamp is a divided one,
  • the moment of inertia of a bundle of wires is equal to the sum of the moments of the individual wires about their respective neutral axes. If the wires are all under tension, the moment of inertia of the bundle may be taken as the sum of the moments of the individual wires about the neutral axis of the bundle.
  • the wires are usually arranged in a spiral, Vwhich tends to equalize the stresses due to bending.
  • friction between the wires counteracts this tendency to a large extent and at the support where the weight of the span plus the pressure of the clamping bolts increases the friction, it is only safe to assume that the conductor behaves in the manner of a solid member. If the damper can be made to adhere closely to the conductor and not be subject to longitudinal slipping, it will give a maximum amount of resistance to bending.
  • This clamping action of the elements 7 on the conductor may be eifected by twisting the wires or elements 7, and particularly the tapered portions 9 thereof.
  • a suitable tool is employed for e ecting lthe twisting of the tapered portions of the elements 7.
  • Suitable clamps 7a V may be applied to the ends of the damper, and the en s of the elements or wires 7 may be bent thereover, as particularly shown by Fig. 6 of the drawm n the form of Fig. 6, Ihave shown an application of my invention to a pin type insulator made up of a plurality of insulator shells 16, mounted on a supporting pin 17, extending upwardly from a cross arm or other structural element 18 of a tower; In this latter form of my invention, the same idea of having the damper structure larger at the middle and gradually decreasing towards its ends is carried out; also, the feature of having the elements 7 at their middle portions arranged parallel with the axis of the cable or conductor and untwisted, whereas the ends are twisted around the conductor as in the other form. In the form of Fig. 6, 19 designates a means for securing the cable at its point of support to the pin type insulator.
  • the method of suspending aerial cables to prevent damage due to vibrations set up in the cable, whlch consists in lapplying to the cable at its point of support a plurality of elements with the central portions thereof disposed parallel with the axis of the cable and untwisted and with the end portions thereof twisted about the cable.
  • the method of. protecting an aerial cable from vibrations which consists in arranging a plurality of tapered elements ⁇ upin Lavande len hwise about a relatively short 'length of t e cable at the point to be protected, and
  • a vibration protector for cables comprising a plurality of individual elements each having a central non-tapering middle portion and tapering twistable end portions,
  • the method of suspending aerial cables to prevent damage due to vibrations set up in the cable which consists in securing to the cable at its point of support a taperr ing contacting mass so elongated and proplortioned to the length and amplitude of a eely vibrating loop lsimultaneously existing in an adjacent span, that the combined moments of inertia of the jcable and the mass at an section between the point of support and t e outer end of the mass will limit the bending of the cable at that section to a curvature substantially equal to the curvature simultaneously existing in thecable at the middle point of the freelyl vibrating loop, said mass being formed of individual tapering elements a plied to the cable and intimately connecte therewith by twisting portions of the tapered elements thereon.
  • the method of suspending aerial cables to revent damage due to vibration set e cable which consists in securing that the combined l to the cable at its pointr of support a tapering contactin mass so elongated and proortioned to t e length and amplitude of a eely vibrating loop simultaneously existing in an adjacent span, as to limit the bending of the cable adjacent the point of'support to a curvature substantially equal to the curvature simultaneously existing in the cable at the middle point of the said loop.
  • the method of suspending aerial cables to revent damage due to vibration set up in t e cable which consists in securing tothe cable at its point of support a tapering contacting mass so elongated and proportioned to the length and amplitude of a so freely vibrating loop simultaneously existing in an adjacent span, as to limit the bending of the cable adjacent the point of support to a curvature substantially equal to the curvature simultaneously existing in the cable at the middle point of the said loop, said mass comprising a plurality of elonated elements closely wound about the conuctor and presenting portions of varying ross section.

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  • Suspension Of Electric Lines Or Cables (AREA)
US249984A 1928-01-27 1928-01-27 Method of and means for suspending and protecting aerial cables Expired - Lifetime US1873798A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL27312D NL27312C (ja) 1928-01-27
US249984A US1873798A (en) 1928-01-27 1928-01-27 Method of and means for suspending and protecting aerial cables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US249984A US1873798A (en) 1928-01-27 1928-01-27 Method of and means for suspending and protecting aerial cables

Publications (1)

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US1873798A true US1873798A (en) 1932-08-23

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NL (1) NL27312C (ja)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457419A (en) * 1944-10-14 1948-12-28 Bbc Brown Boveri & Cie High-voltage bushing
US2587521A (en) * 1945-06-23 1952-02-26 Thomas F Peterson Cable reinforcing and supporting device
US2609653A (en) * 1948-04-27 1952-09-09 Preformed Line Products Co Helically preformed elements on stranded line
US2722393A (en) * 1951-06-08 1955-11-01 Thomas F Peterson Reinforcement and suspension of linear bodies
US2729054A (en) * 1952-11-19 1956-01-03 Thomas F Peterson Helically-preformed armor for linear bodies
US2884476A (en) * 1955-09-26 1959-04-28 Anderson Brass Works Strain clamp for cables and the like
US2894057A (en) * 1954-10-15 1959-07-07 Submarine Cables Ltd Submarine cables having anti kink armouring
US2929195A (en) * 1952-11-19 1960-03-22 Preformed Line Products Co Oversize helically-preformed armor for linear bodies
US3026077A (en) * 1951-06-08 1962-03-20 Preformed Line Products Co Support for armored cables
DE1230477B (de) * 1958-03-18 1966-12-15 Aluminium Francais Haengeklemme mit Schwingungsdaempfer fuer Freileitungen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457419A (en) * 1944-10-14 1948-12-28 Bbc Brown Boveri & Cie High-voltage bushing
US2587521A (en) * 1945-06-23 1952-02-26 Thomas F Peterson Cable reinforcing and supporting device
US2609653A (en) * 1948-04-27 1952-09-09 Preformed Line Products Co Helically preformed elements on stranded line
US2722393A (en) * 1951-06-08 1955-11-01 Thomas F Peterson Reinforcement and suspension of linear bodies
US3026077A (en) * 1951-06-08 1962-03-20 Preformed Line Products Co Support for armored cables
US2729054A (en) * 1952-11-19 1956-01-03 Thomas F Peterson Helically-preformed armor for linear bodies
US2929195A (en) * 1952-11-19 1960-03-22 Preformed Line Products Co Oversize helically-preformed armor for linear bodies
US2894057A (en) * 1954-10-15 1959-07-07 Submarine Cables Ltd Submarine cables having anti kink armouring
US2884476A (en) * 1955-09-26 1959-04-28 Anderson Brass Works Strain clamp for cables and the like
DE1230477B (de) * 1958-03-18 1966-12-15 Aluminium Francais Haengeklemme mit Schwingungsdaempfer fuer Freileitungen

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Publication number Publication date
NL27312C (ja)

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