US3584133A - Vibration damper for electric lines - Google Patents

Vibration damper for electric lines Download PDF

Info

Publication number
US3584133A
US3584133A US1723A US3584133DA US3584133A US 3584133 A US3584133 A US 3584133A US 1723 A US1723 A US 1723A US 3584133D A US3584133D A US 3584133DA US 3584133 A US3584133 A US 3584133A
Authority
US
United States
Prior art keywords
wires
twisted
wire
cable
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
US1723A
Other languages
English (en)
Inventor
Rodolfo Claren
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.)
A Salvi and C SRL
Original Assignee
A Salvi and C SRL
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 A Salvi and C SRL filed Critical A Salvi and C SRL
Application granted granted Critical
Publication of US3584133A publication Critical patent/US3584133A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/14—Vibration-dampers; Shock-absorbers of cable support type, i.e. frictionally-engaged loop-forming cables

Definitions

  • Vibration damper for suspended cables of elecalms g g tric lines comprising a pair of inertia members fixed to the [S2] U.S.Cl 174/42 ends of a resilient member or carrying cable, said resilient [51] Int.
  • Cl l-l02g 7/14 member being constituted by a length of wire rope formed by [50] Field ofSearch 174/42, at least 18 wires twisted helically over a rectilinear central PATENTEU JUN 8l97
  • the present invention relates to a vibration damper for suspended cables, comprising a pair of counterweights or inertia members fixed to the ends of a resilient element or carrying cable and a clamp which engages the resilient element for attachment of the damper to a suspended cable subjected to vibrations due to the wind.
  • the present invention relates to some constructive modifications aimed at further enhancing the optimum properties of the dampers described in my U.S. Pat. No. 3,432,610 and, above all, at obtaining greater uniformity in the characteristics thereof.
  • the present invention now proposes a type of carrying cable which has substantially improved damping characteristics, especially as regards the uniformity of behavior, which is a fundamental characteristic for carrying out mass production.
  • the carrying cable according to the present invention is characterized in that it is constituted by a length of wire rope formed by at least I8 wires twisted helically over a rectilinear central wire there being at least one short bush which tightly encloses and grips the twisted wires of the wire rope at a localized area thereof, leaving the major part of the twisted wires unenclosed.
  • the 18 helically twisted wires are disposed in two layers, the inner one of which comprises six wires in direct contact with the rectilinear central wire, while the outer layer comprises l2 wires twisted in a helix of opposite sense to the helix of the wires of the inner layer.
  • FIG. 1 consists of a side view, partly in section, of a carrying cable of known type
  • FIG. 2 is a view, similar to FIG. I, of a carrying cable according to the invention.
  • FIG. 3 is a side view, partly in section, of a complete damper according to the invention.
  • FIGS. 4, 5 and 6 are graphs respectively illustrating the behavior of a seven-wire cable of known type and of two alternate embodiments of the l9-wire cable according to the invention.
  • FIG. I a cross section with a longitudinal view of a galvanized steel cable with seven wires, which is generally employed for conventional Stockbridge-type dampers.
  • the cable is composed of a straight central wire over which six wires forming the outer layer of the cable are twisted.
  • the stranding pitch P varies in function of the pitch diameter D of the cable.
  • Each of the six wires of the outer layer bears on the straight central wire according to a helical profile actually defined by the stranding pitch P and by the diameter D.
  • FIG. 2 shows a cross section and a longitudinal view of a 19- wire galvanized steel cable according to the invention.
  • this cable differs from the sevenwire cable in that it has another layer of 12 wires twisted over the layer of six wires.
  • the stranding pitch P is slightly different to the stranding pitch P.
  • the sense in which the l2-wire outer layer is twisted is opposite to the sense in which the six-wire layer is twisted.
  • Each of the 12 wires of the outer layer bears on the six wires of the inner layer along a helical profile (defined by the pitch P and by the diameter D not continuously but only at the points where it crosses the wires of the inner layer.
  • the six wires of the outer layer of the seven-wire cable and the I8 wires of the two layers of the 19- wire cable are subjected to a permanent deformation, called preforming, as a result of which when the stranding has been effected the wires tend.to close up, the six wires of the first layer exerting a pressure on the straight central wire and the 12 wires of the second layer exerting a pressure on the six wires of the first layer.
  • the l9- wire cables having two stranding layers exhibit damping characteristics which are substantially more constant and uniform. This may be attributed, at least in part, to the fact that in a seven-wire cable the variation in the coefficient of friction or in the pressure of one or two wires has an effect on the total damping value of the cable which is far greater than that to be observed in a cable comprising 19 wires.
  • the uniformity of behavior of the carrying cable can be further improved by fitting to the cable one or more suitably compressed short bushes apt to tightly enclose and grip the wires of the cable in localized area thereof, leaving the major part ofthe twisted wires unenclosed. It has been found that the provision of such bushes produces a reduction in the scattering of the response values as shown below, because it tends to equalize the friction between the wire strands.
  • FIG. 3 shows precisely a damper of the type described in my U.S. Pat. No. 3,432,6l0, to the carrying cable of which are fitted a bush A, on the central portion of the cable, and two bushes B, at the two ends of the cable.
  • the bushes A and B are of metal and are clamped on the carrying cable by simple compression and deformation with a technique known per se.
  • H6. 6 shows, in a similar manner to FIGS. 4 and 5, the response curves ofa group of 50 dampers with l9-wire cables, equipped with bushes according to the invention. The positive effect of the bushes on the reduction of the scattering of the response values can easily be observed by a comparison with the graphs of FIGS. 4 and 5.
  • a vibration damper comprising a pair of inertia members secured to the opposite ends of a resilient member, the latter having a single clamp for attaching same to a suspended elongated member subject to aeolian vibration, the improvement wherein said resilient member is constituted by a length ofthe wire rope formed of at at least 18 wires twisted helically over a rectilinear central wire, and wherein there is at least one short bush which tightly encloses and grips the twisted wires of the wire rope at a localized area thereof leaving the major part ofthe twisted wires unenclosed.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Flexible Shafts (AREA)
  • Ropes Or Cables (AREA)
  • Bridges Or Land Bridges (AREA)
US1723A 1969-08-05 1970-01-09 Vibration damper for electric lines Expired - Lifetime US3584133A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2060569 1969-08-05

Publications (1)

Publication Number Publication Date
US3584133A true US3584133A (en) 1971-06-08

Family

ID=11169437

Family Applications (1)

Application Number Title Priority Date Filing Date
US1723A Expired - Lifetime US3584133A (en) 1969-08-05 1970-01-09 Vibration damper for electric lines

Country Status (8)

Country Link
US (1) US3584133A (enrdf_load_stackoverflow)
JP (1) JPS51720B1 (enrdf_load_stackoverflow)
AT (1) AT300081B (enrdf_load_stackoverflow)
DE (1) DE1963959C3 (enrdf_load_stackoverflow)
ES (1) ES375550A2 (enrdf_load_stackoverflow)
FR (1) FR2057621A6 (enrdf_load_stackoverflow)
GB (1) GB1295880A (enrdf_load_stackoverflow)
SE (1) SE351534B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4620060A (en) * 1984-03-22 1986-10-28 A. Salvi & C. S.P.A. Adjustable vibration damper for stretched suspended cables
US20040035601A1 (en) * 2000-07-14 2004-02-26 Dulhunty Philip Wellesley Vibration damper for overhead power lines
US20040149474A1 (en) * 2003-01-30 2004-08-05 Brittain Carl C. Clamp for a vibration damper and method of installing same
US20100314210A1 (en) * 2006-12-26 2010-12-16 Toyota Jidosha Kabushiki Kaisha Vibration damping device
US20110024152A1 (en) * 2009-02-19 2011-02-03 Jose Joao Espindola Device for dynamically neutralizing vibrations in single cable overhead power transmission lines
US20190229512A1 (en) * 2018-01-22 2019-07-25 Hubbell Incorporated Self-seating damper clamp
CN111555227A (zh) * 2020-06-09 2020-08-18 国网冀北电力有限公司秦皇岛供电公司 防震锤装置
US20240218912A1 (en) * 2023-01-03 2024-07-04 Preformed Line Products Co. Vibration damper

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052747A (en) * 1960-08-11 1962-09-04 Aluminum Co Of America Aeolian vibration dampers
US3327048A (en) * 1966-04-28 1967-06-20 Haro Lauri Petter Allan Vibration damping apparatus
US3432610A (en) * 1967-01-14 1969-03-11 Salvi & Co Spa A Vibration dampers for suspended members
US3443019A (en) * 1968-06-20 1969-05-06 Lacol Ind Ltd Spacer damper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052747A (en) * 1960-08-11 1962-09-04 Aluminum Co Of America Aeolian vibration dampers
US3327048A (en) * 1966-04-28 1967-06-20 Haro Lauri Petter Allan Vibration damping apparatus
US3432610A (en) * 1967-01-14 1969-03-11 Salvi & Co Spa A Vibration dampers for suspended members
US3443019A (en) * 1968-06-20 1969-05-06 Lacol Ind Ltd Spacer damper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Bellino, Robert A., Insulation, How to Select a Multiconductor Cable, Dec. 1967, pages 64 70. Copy in 174-128. *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4620060A (en) * 1984-03-22 1986-10-28 A. Salvi & C. S.P.A. Adjustable vibration damper for stretched suspended cables
US20040035601A1 (en) * 2000-07-14 2004-02-26 Dulhunty Philip Wellesley Vibration damper for overhead power lines
US6943290B2 (en) * 2000-07-14 2005-09-13 Dulhunty Power (Aust) Pty. Limited Vibration damper for overhead power lines
US20040149474A1 (en) * 2003-01-30 2004-08-05 Brittain Carl C. Clamp for a vibration damper and method of installing same
US6774303B1 (en) * 2003-01-30 2004-08-10 Pinnacle West Capital Corporation Clamp for a vibration damper and method of installing same
US20040194990A1 (en) * 2003-01-30 2004-10-07 Brittain Carl C. Clamp for a vibration damper and method of installing same
US6943291B2 (en) 2003-01-30 2005-09-13 Pinnacle West Capital Corporation Clamp for a vibration damper and method of installing same
US8807304B2 (en) * 2006-12-26 2014-08-19 Toyota Jidosha Kabushiki Kaisha Vibration damping device
US20100314210A1 (en) * 2006-12-26 2010-12-16 Toyota Jidosha Kabushiki Kaisha Vibration damping device
US20110024152A1 (en) * 2009-02-19 2011-02-03 Jose Joao Espindola Device for dynamically neutralizing vibrations in single cable overhead power transmission lines
US8309846B2 (en) * 2009-02-19 2012-11-13 Jose Joao de Espindola Device for dynamically neutralizing vibrations in single cable overhead power transmission lines
US20190229512A1 (en) * 2018-01-22 2019-07-25 Hubbell Incorporated Self-seating damper clamp
US10965112B2 (en) * 2018-01-22 2021-03-30 Hubbell Incorporated Self-seating damper clamp
US11721964B2 (en) 2018-01-22 2023-08-08 Hubbell Incorporated Self-seating damper clamp
CN111555227A (zh) * 2020-06-09 2020-08-18 国网冀北电力有限公司秦皇岛供电公司 防震锤装置
US20240218912A1 (en) * 2023-01-03 2024-07-04 Preformed Line Products Co. Vibration damper

Also Published As

Publication number Publication date
DE1963959A1 (de) 1971-02-18
FR2057621A6 (enrdf_load_stackoverflow) 1971-05-21
ES375550A2 (es) 1972-06-01
SE351534B (enrdf_load_stackoverflow) 1972-11-27
AT300081B (de) 1972-07-10
JPS51720B1 (enrdf_load_stackoverflow) 1976-01-10
DE1963959B2 (de) 1978-10-26
DE1963959C3 (de) 1979-06-21
GB1295880A (enrdf_load_stackoverflow) 1972-11-08

Similar Documents

Publication Publication Date Title
US2587521A (en) Cable reinforcing and supporting device
US3813481A (en) Steel supported aluminum overhead conductors
US2469167A (en) Vibration damper
US3400209A (en) Aeolian vibration damper
US3463870A (en) Spacer/damper
US6943290B2 (en) Vibration damper for overhead power lines
US3584133A (en) Vibration damper for electric lines
US3539139A (en) Appliance for linear bodies
US3749813A (en) Expanded self-damping electrical conductor
CN102210076A (zh) 多级响应振动阻尼器组件
US4549035A (en) Aerodynamic damper for suppressing galloping in overhead transmission lines
US1999273A (en) Conductor
US2359090A (en) Composite electrical conductor
US2998696A (en) Gripping surface for preformed helical rods
US3496285A (en) Self-damping electrical line
US3445586A (en) Loose-core conductor having improved self-damping combined with improved internal wear resistance
US3664010A (en) Line tie
US3378631A (en) Conductor with self-damping characteristics
US3555625A (en) Double support line tie
US2075996A (en) Electrical conductor
US2172810A (en) Reinforcement for transmission lines and the like
US2321021A (en) Composite electrical conductor
US2118630A (en) Electric cable
GB2068081A (en) Vibration dampers of the stockbridge type
US3443019A (en) Spacer damper