CA1210104A - Damping spacer for bundle conductors of high-voltage electric lines, with improved damping effectiveness - Google Patents
Damping spacer for bundle conductors of high-voltage electric lines, with improved damping effectivenessInfo
- Publication number
- CA1210104A CA1210104A CA000442272A CA442272A CA1210104A CA 1210104 A CA1210104 A CA 1210104A CA 000442272 A CA000442272 A CA 000442272A CA 442272 A CA442272 A CA 442272A CA 1210104 A CA1210104 A CA 1210104A
- Authority
- CA
- Canada
- Prior art keywords
- central body
- damping
- spacer
- damping spacer
- inertial masses
- 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
Links
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
- H02G7/12—Devices for maintaining distance between parallel conductors, e.g. spacer
- H02G7/125—Damping spacers
Landscapes
- Suspension Of Electric Lines Or Cables (AREA)
- Communication Cables (AREA)
- Inorganic Insulating Materials (AREA)
- Insulated Conductors (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Vibration Prevention Devices (AREA)
- Organic Insulating Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention concerns a damping spacer for bundle conductors of high-voltage electric lines, which comprises a stiff central body (1), at least two connecting clamps (3) each anchored to a respective conductor of the bundle, each clamp having rigid extension (2), and at least one springing hinge element for connecting the extension (2) to the stiff body (1).
Rigid arms (4), carrying at the ends inertial masses (5), are furthermore fixedly connected to the central body (1), said masses being so arranged that their barycenters are far from the barycenter of the central body (1), beyond the axes of said springing hinges.
The invention concerns a damping spacer for bundle conductors of high-voltage electric lines, which comprises a stiff central body (1), at least two connecting clamps (3) each anchored to a respective conductor of the bundle, each clamp having rigid extension (2), and at least one springing hinge element for connecting the extension (2) to the stiff body (1).
Rigid arms (4), carrying at the ends inertial masses (5), are furthermore fixedly connected to the central body (1), said masses being so arranged that their barycenters are far from the barycenter of the central body (1), beyond the axes of said springing hinges.
Description
~2~(~1Q4 I~PROVED LIFE PROTECTION DEVI~E
As known, the use of conductor bundles for high-volta ge electric lines determi.nes the need to dispose of spacing elements - at regular intervals along the line - between the elementary conductors of a same bundle, apt to prevent said bundles from intersecting, or anyhow from overlapping.
Such a drawback may be determined by relative move ments of one conductor in respect of the other - deriving from different elongations, from the action of the wind, from breaking loose of ice or snow muffs, or from other external mechanical pulses - as well as by electrodynamic effect of mutual attraction, deriving from the short cir-cuit currents which may occur on the line.
Spacers designed to connect the sub-conductors of a same bundle should hence satisfy two opposite requirements:
on one hand, they must be sufficiently flexible, so as not to damage the conductors at the connection point when they are subjected to normal stresses; on the other hand, they must be sufficiently stout in order to stand, without undergoing permanent deformation, the compressive stresses deriving from the electrodynamic effect of short circui.t currents.
Several types of spacers, apt to perform this double function, are already known. Among these, there is for example the spacer described in the Italian Patent No.
83~.61g.
An important improvement of such spacers has been realized with the so-called "damping spacers", for instance of the type described in the Italian Patent No. 864.054.
This patent actually illustrates a structure which - as well as performing the described function of keeping the sub-conductors of the bundle separated and spaced, with a differentiated behaviour according to the stresses to which lZ~O~
the conductors are subjected - is apt to perEorm a Eunction of dampening the oscillations produced on said conductors by the action of the wind.
The spacer described in this patent has a defor-mable elastic structure, anchored to the conductors of thebundle through connecting clamps, herein said clamps comprise rigid extensions, the free ends of which are asso-ciated to a stiff central body through at least one springing hinge element. Each hinge element has structural characteristics such as to dissipate energy when subjected to oscillations, in order to accomplish the desired dam-pening of said oscillations.
In the cited ~talian Patent No. ~64.054, each hinge element simpl~7 consists of a short length of wire rope, the ends of which are firmly fixed onto the rigid parts which it has to connect. The oscillation energy is dissipated due to -the sliding friction between the single strands of the wire rope length.
Other types of damping spacers are described in the Italian Patents No. 936.310 and No. 962~511; these in turn comprise a central stiff body, to which the rigid extensicns of the connecting clamps are connected by way of springing hinges. Said hinges consist of a pair of mutually rotating elements, between which are interposed rubber pads, which get compressed on rotation - even to a slight extent - of one element in respect of the other, due to oscillation of the clamps in respect of ~he stiff central body.
Applicants have also developed a damping spacer that comprises springing hinges, incorporating rubber ~Zl(~CP4 elements. In this structure, however, the rubber elements are not subjected to compressive stresses, but rather to shearing stresses.
In the first as well as in the second case, to the elastic deformation of the rubber elements - produced by the oscillations to which the hinges are subjected - there is associated a dissipation of energy, deriving from the mechanical hysteresis of said rubber elements, and to this dissipation of energy corresponds the desired damping of the oscillations.
All such known devices, though considered fairly effi-cient for the normal uses foreseen, have however evidenced - in the course of accurate tests - a very low damping force in the event of the bundle of conductors being subjected to low frequency oscillation movements and/or to torsional oscillation movements. Tn fact, in these cases -and particularly ~Jhen a so-called "twin-wire" bundle is involved - the stiff central body of the spacer tends to follow the low frequency oscillation or the torsion of the bundle, determining only slightest deformations in corre-spondence of the hinges and thus very low dampening effect.
The object of the present invention is to eliminate these drawbacks and to realize a spacer with a structure allowing to obtain a sat;isfactory damping even in the case of low frequency or torsional oscillations.
This result is achieved essentially owing to the fact that the stiff central body of the spacer has a high moment of inertia obtained, withou-t considerable weight increase, by associating to said stiff central body, far from its barycenter, inertial masses rigidly connected thereto.
According to a preferred embodiment, in a damping spacer structure of the type having a stiff central body and hinge elements incorporating deformable rubber pads -for instance as described above for -the damping spacer developed by applican-ts - the increase of the moment of inertia is obtained by -Fixing inertial masses, preferably spherical, to one end of rigid arms, the other end of which is fixed to the stiff central body, the barycenter of each inertial mass being placed, far from the barycenter of the stiff central body, beyond the axis of the hinges.
Further characteristics and advantages of the structure according to the present invention will anyhow be more evident from the following description of a preferred embodiment, illustrated by way of example in the accom-panying drawing, in which:
Figure 1 is a diagrammatic side view of a damping spacer, to be used in a "twin-wire" bundle, and ~igure 2 is a plan view of one of the two extre-mities of said spacer.
As said, the drawing illustrates the embodiment of a spacer to be used with a "twin-wire" bundle. This embodiment has been chosen, on one hand, because it places more in evidence the problems concerning the dampening of low frequency and/or torsional oscillations, with respect to bundles with more than two conductors and, on the other hand, because this is the simplest form of spacer and a technician in the field may, without any difficulty, transfer the teachings deriving therefrom to bundles with more than two conductors.
The illustrated spacer comprises a stiff central body 1, whose shape substantially corresponds to that of the central body of the spacer of the above development by applicants; the body has an elongated shape, with enlarged end portions incorporating springing hinges with rubber pads subjects to shearing stresses.
~21~
On the hinge axes la are mounted oscillating the extensi.ons 2 of the clamps 3 of connection to the conduc-tors C (shown by a dashed line).
According to the invention, on the hinge axes la are also mounted the rigid arms 4, carrying at their free end inertial masses 5, of preferably spherical shape.
The arms 4 are anchored to the hinge axis la and are furthermore housed, with their end portion connected to said hinge, into a recess lb of the stiff body 1; said recess is apt to prevent their rotation about the axis la, thereby making them rigidly connected to the body 1 itself.
The arms 4 project outwardly from the body 1, so that the barycenter of the inertial masses 5 is well beyond the axis of the corresponding hinge~ in respect to the bary-center of the body 1. Preferably, the length of the arms 4is such that the barycenter of the masses 5 lies substan-tially on the vertical plane Y~Y crossing the axis of the conductor G. Also preferably, the arms 4 are curved frorn the outside towards the center of the body 1, so that the barycenter of the masses 5 lies - as clearly shown in figure 2 - substantially on the median vertical plane X-X
of the stiff body 1.
Having obtained, wit;h this structure, to considerably increase the moment of inertia of the spacer in its ~hole, without however increasi.ng its weight to an undesirable extent, it has been possible to ascertain that, in the presence of low frequency and/or torsional oscillations -during which the spacers of known technique tend to rigidly follow the movement of the conductors, without producing any oscillation of the hinges - the sp&cer according to the invention behaves in a fully efficient manner: the stiff body 1, thanks to its high moment of inertia, tends to keep its initial rest position and the oscillations of the lQ~
conductors - even low frequency or torsional osci]lations -turn into an oscillation of the extensions 2 in respect of the body 1, with deformation of the rubber elements of the hinges and consequent effective damping actionO
It is anyhow understood that the invention is by no means limited to the embodiment illustrated, which has been given by mere way of example, but that there may be various other embodiments differing from the same, all within reach of a technician in the field and hence all falling within the scope of the invention itself. In par-ticular, as already said, the invention should not be limited to spacers for "twin-wire" bundles, and even less to the use of a space:r such as that described above as the development by applicants, this development has in fact been cited merely to facilitate the understanding of the invention, whose fundamental characteristics should instead be considered as applicable to any other type of spacer of known technique, and in particular to the spacers described in the other patents cited in the introductory part of this specification.
As known, the use of conductor bundles for high-volta ge electric lines determi.nes the need to dispose of spacing elements - at regular intervals along the line - between the elementary conductors of a same bundle, apt to prevent said bundles from intersecting, or anyhow from overlapping.
Such a drawback may be determined by relative move ments of one conductor in respect of the other - deriving from different elongations, from the action of the wind, from breaking loose of ice or snow muffs, or from other external mechanical pulses - as well as by electrodynamic effect of mutual attraction, deriving from the short cir-cuit currents which may occur on the line.
Spacers designed to connect the sub-conductors of a same bundle should hence satisfy two opposite requirements:
on one hand, they must be sufficiently flexible, so as not to damage the conductors at the connection point when they are subjected to normal stresses; on the other hand, they must be sufficiently stout in order to stand, without undergoing permanent deformation, the compressive stresses deriving from the electrodynamic effect of short circui.t currents.
Several types of spacers, apt to perform this double function, are already known. Among these, there is for example the spacer described in the Italian Patent No.
83~.61g.
An important improvement of such spacers has been realized with the so-called "damping spacers", for instance of the type described in the Italian Patent No. 864.054.
This patent actually illustrates a structure which - as well as performing the described function of keeping the sub-conductors of the bundle separated and spaced, with a differentiated behaviour according to the stresses to which lZ~O~
the conductors are subjected - is apt to perEorm a Eunction of dampening the oscillations produced on said conductors by the action of the wind.
The spacer described in this patent has a defor-mable elastic structure, anchored to the conductors of thebundle through connecting clamps, herein said clamps comprise rigid extensions, the free ends of which are asso-ciated to a stiff central body through at least one springing hinge element. Each hinge element has structural characteristics such as to dissipate energy when subjected to oscillations, in order to accomplish the desired dam-pening of said oscillations.
In the cited ~talian Patent No. ~64.054, each hinge element simpl~7 consists of a short length of wire rope, the ends of which are firmly fixed onto the rigid parts which it has to connect. The oscillation energy is dissipated due to -the sliding friction between the single strands of the wire rope length.
Other types of damping spacers are described in the Italian Patents No. 936.310 and No. 962~511; these in turn comprise a central stiff body, to which the rigid extensicns of the connecting clamps are connected by way of springing hinges. Said hinges consist of a pair of mutually rotating elements, between which are interposed rubber pads, which get compressed on rotation - even to a slight extent - of one element in respect of the other, due to oscillation of the clamps in respect of ~he stiff central body.
Applicants have also developed a damping spacer that comprises springing hinges, incorporating rubber ~Zl(~CP4 elements. In this structure, however, the rubber elements are not subjected to compressive stresses, but rather to shearing stresses.
In the first as well as in the second case, to the elastic deformation of the rubber elements - produced by the oscillations to which the hinges are subjected - there is associated a dissipation of energy, deriving from the mechanical hysteresis of said rubber elements, and to this dissipation of energy corresponds the desired damping of the oscillations.
All such known devices, though considered fairly effi-cient for the normal uses foreseen, have however evidenced - in the course of accurate tests - a very low damping force in the event of the bundle of conductors being subjected to low frequency oscillation movements and/or to torsional oscillation movements. Tn fact, in these cases -and particularly ~Jhen a so-called "twin-wire" bundle is involved - the stiff central body of the spacer tends to follow the low frequency oscillation or the torsion of the bundle, determining only slightest deformations in corre-spondence of the hinges and thus very low dampening effect.
The object of the present invention is to eliminate these drawbacks and to realize a spacer with a structure allowing to obtain a sat;isfactory damping even in the case of low frequency or torsional oscillations.
This result is achieved essentially owing to the fact that the stiff central body of the spacer has a high moment of inertia obtained, withou-t considerable weight increase, by associating to said stiff central body, far from its barycenter, inertial masses rigidly connected thereto.
According to a preferred embodiment, in a damping spacer structure of the type having a stiff central body and hinge elements incorporating deformable rubber pads -for instance as described above for -the damping spacer developed by applican-ts - the increase of the moment of inertia is obtained by -Fixing inertial masses, preferably spherical, to one end of rigid arms, the other end of which is fixed to the stiff central body, the barycenter of each inertial mass being placed, far from the barycenter of the stiff central body, beyond the axis of the hinges.
Further characteristics and advantages of the structure according to the present invention will anyhow be more evident from the following description of a preferred embodiment, illustrated by way of example in the accom-panying drawing, in which:
Figure 1 is a diagrammatic side view of a damping spacer, to be used in a "twin-wire" bundle, and ~igure 2 is a plan view of one of the two extre-mities of said spacer.
As said, the drawing illustrates the embodiment of a spacer to be used with a "twin-wire" bundle. This embodiment has been chosen, on one hand, because it places more in evidence the problems concerning the dampening of low frequency and/or torsional oscillations, with respect to bundles with more than two conductors and, on the other hand, because this is the simplest form of spacer and a technician in the field may, without any difficulty, transfer the teachings deriving therefrom to bundles with more than two conductors.
The illustrated spacer comprises a stiff central body 1, whose shape substantially corresponds to that of the central body of the spacer of the above development by applicants; the body has an elongated shape, with enlarged end portions incorporating springing hinges with rubber pads subjects to shearing stresses.
~21~
On the hinge axes la are mounted oscillating the extensi.ons 2 of the clamps 3 of connection to the conduc-tors C (shown by a dashed line).
According to the invention, on the hinge axes la are also mounted the rigid arms 4, carrying at their free end inertial masses 5, of preferably spherical shape.
The arms 4 are anchored to the hinge axis la and are furthermore housed, with their end portion connected to said hinge, into a recess lb of the stiff body 1; said recess is apt to prevent their rotation about the axis la, thereby making them rigidly connected to the body 1 itself.
The arms 4 project outwardly from the body 1, so that the barycenter of the inertial masses 5 is well beyond the axis of the corresponding hinge~ in respect to the bary-center of the body 1. Preferably, the length of the arms 4is such that the barycenter of the masses 5 lies substan-tially on the vertical plane Y~Y crossing the axis of the conductor G. Also preferably, the arms 4 are curved frorn the outside towards the center of the body 1, so that the barycenter of the masses 5 lies - as clearly shown in figure 2 - substantially on the median vertical plane X-X
of the stiff body 1.
Having obtained, wit;h this structure, to considerably increase the moment of inertia of the spacer in its ~hole, without however increasi.ng its weight to an undesirable extent, it has been possible to ascertain that, in the presence of low frequency and/or torsional oscillations -during which the spacers of known technique tend to rigidly follow the movement of the conductors, without producing any oscillation of the hinges - the sp&cer according to the invention behaves in a fully efficient manner: the stiff body 1, thanks to its high moment of inertia, tends to keep its initial rest position and the oscillations of the lQ~
conductors - even low frequency or torsional osci]lations -turn into an oscillation of the extensions 2 in respect of the body 1, with deformation of the rubber elements of the hinges and consequent effective damping actionO
It is anyhow understood that the invention is by no means limited to the embodiment illustrated, which has been given by mere way of example, but that there may be various other embodiments differing from the same, all within reach of a technician in the field and hence all falling within the scope of the invention itself. In par-ticular, as already said, the invention should not be limited to spacers for "twin-wire" bundles, and even less to the use of a space:r such as that described above as the development by applicants, this development has in fact been cited merely to facilitate the understanding of the invention, whose fundamental characteristics should instead be considered as applicable to any other type of spacer of known technique, and in particular to the spacers described in the other patents cited in the introductory part of this specification.
Claims (6)
1. Damping spacer for bundle conductors of high-voltage electric lines comprising, in known manner, a stiff central body, and at least two connecting clamps each anchored to a respective sub-conductor of the bundle, each clamp having a rigid extension connected, through at least one springing hinge element, to said stiff central body, characterized in that, inertial masses are furthermore rigidly associated to said central body, the barycenters of the masses being far from the barycenter of the central body.
2. Damping spacer as in claim 1, comprising rigid arms fixedly connected to the central body and out-wardly projecting therefrom, carrying at the ends said inertial masses.
3. Damping spacer as in claims 1 or 2, wherein the barycenters of said inertial masses are placed, in respect of the barycenter of said stiff central body, beyond the axes of said springing hinges.
4. Damping spacer as in claim 1 or claim 2, wherein the barycenters of said inertial masses lie substantially on the vertical plane crossing the axis of the corresponding sub-conductor.
5. Damping spacer as in claim 1 or claim 2, wherein the barycenters of said inertial masses lie substantially on the median vertical plane of said central body.
6. Damping spacer as in claims 1 or 2, wherein said inertial masses have a substantially spherical con-figuration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT24501/82A IT1154351B (en) | 1982-11-30 | 1982-11-30 | DAMPING SPACER FOR BAND CONDUCTORS OF HIGH VOLTAGE ELECTRIC LINES, WITH IMPROVED DAMPING EFFECTIVENESS |
| IT24501A/82 | 1982-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1210104A true CA1210104A (en) | 1986-08-19 |
Family
ID=11213769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000442272A Expired CA1210104A (en) | 1982-11-30 | 1983-11-30 | Damping spacer for bundle conductors of high-voltage electric lines, with improved damping effectiveness |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4525596A (en) |
| EP (1) | EP0113035B1 (en) |
| AT (1) | ATE62089T1 (en) |
| BR (1) | BR8306568A (en) |
| CA (1) | CA1210104A (en) |
| DE (1) | DE3382232D1 (en) |
| ES (1) | ES283483Y (en) |
| IN (1) | IN161779B (en) |
| IT (1) | IT1154351B (en) |
| PT (1) | PT77729B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL192662B1 (en) * | 1998-11-02 | 2006-11-30 | Tyco Electronics Logistics Ag | Line spacer for power transmission lines |
| CA2274402A1 (en) | 1999-06-11 | 2000-12-11 | Hydro-Quebec | Damper for an overhead cable |
| US8203074B2 (en) * | 2006-10-25 | 2012-06-19 | Advanced Technology Holdings Ltd. | Messenger supported overhead cable for electrical transmission |
| CN102005711B (en) * | 2009-09-03 | 2012-12-19 | 四平线路器材厂 | Jumper device for 6-4 bundle conductors of power transmission line |
| CA2728821C (en) | 2010-01-19 | 2018-09-25 | Albert S. Richardson Jr. | Spacer device |
| US10014677B2 (en) | 2010-01-19 | 2018-07-03 | Elaine M. Richardson | Spacer device |
| US10063043B2 (en) | 2010-01-19 | 2018-08-28 | Ar Patents, Llc | Spacer device |
| US9106062B2 (en) | 2011-06-06 | 2015-08-11 | Hubbell Incorporated | Geared spacer assembly for conductor bundle |
| US9412493B2 (en) * | 2011-06-08 | 2016-08-09 | Hubbell Incorporated | Spacer assembly for conductor bundle |
| US9093202B2 (en) | 2011-06-08 | 2015-07-28 | Hubbell Incorporated | Elastomeric gripping member for spacer assembly |
| CA2938428C (en) * | 2014-02-03 | 2021-08-10 | Albert S. Richardson Jr. | Spacer device for overhead line |
| US9570897B2 (en) | 2014-02-11 | 2017-02-14 | Hubbell Incorporated | Hinged clamp for spacer-damper |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH403901A (en) * | 1963-11-22 | 1965-12-15 | Fischer Ag Georg | Spacer for electrical bundle conductors |
| US3230295A (en) * | 1964-05-25 | 1966-01-18 | Line And Cable Accessories Ltd | Spring loaded spacer-damper |
| US3885086A (en) * | 1971-07-22 | 1975-05-20 | Herbert James Houston | Spacer-damper assembly |
| US3904811A (en) * | 1971-07-28 | 1975-09-09 | Fujikura Ltd | Overhead transmission lines with damper means for preventing galloping oscillations |
-
1982
- 1982-11-30 IT IT24501/82A patent/IT1154351B/en active
-
1983
- 1983-11-24 EP EP83111769A patent/EP0113035B1/en not_active Expired - Lifetime
- 1983-11-24 DE DE8383111769T patent/DE3382232D1/en not_active Expired - Lifetime
- 1983-11-24 AT AT83111769T patent/ATE62089T1/en active
- 1983-11-25 PT PT77729A patent/PT77729B/en unknown
- 1983-11-29 US US06/556,046 patent/US4525596A/en not_active Expired - Fee Related
- 1983-11-29 BR BR8306568A patent/BR8306568A/en not_active IP Right Cessation
- 1983-11-29 ES ES1983283483U patent/ES283483Y/en not_active Expired
- 1983-11-30 IN IN1468/CAL/83A patent/IN161779B/en unknown
- 1983-11-30 CA CA000442272A patent/CA1210104A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0113035A3 (en) | 1987-04-08 |
| US4525596A (en) | 1985-06-25 |
| EP0113035A2 (en) | 1984-07-11 |
| BR8306568A (en) | 1984-07-03 |
| ES283483U (en) | 1985-06-16 |
| PT77729A (en) | 1983-12-01 |
| IT8224501A0 (en) | 1982-11-30 |
| DE3382232D1 (en) | 1991-05-02 |
| EP0113035B1 (en) | 1991-03-27 |
| IT8224501A1 (en) | 1984-05-30 |
| IN161779B (en) | 1988-02-06 |
| IT1154351B (en) | 1987-01-21 |
| ATE62089T1 (en) | 1991-04-15 |
| PT77729B (en) | 1986-03-18 |
| ES283483Y (en) | 1986-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |