Ribe spacer dampers offer an intelligent solution to this problem. Let us explain the concept of tuned mass dampers in brief. Ozgen september 2012, 92 pages this thesis aims to examine the performance of stockbridge dampers used to suppress aeolian vibrations on overhead transmission lines arising from the wind. The damper of claim 1 in which the suspender has a journal through which the resilient member passes. Stockbridge damper, aeolian vibrations, energy balance method. Overhead line, requirements and tests for fittings 5. To reduce the windinduced vibration of a transmission tower, a new type of vibration control device that pounding tuned mass damper ptmd is proposed in the ptmd, a limiting collar with viscoelastic material laced on. The frequency of aeolian vibration ranges from 3 to 50 hz and the wind.
Jul 06, 2019 lines damaged by vibration may have to be derated or even taken out of service until repairs can be made. The result is that for future aeolian vibration activity, the conductor will not have the benefit of the dampers, and bending stresses will increase at the support hardware. The cable is then vibrated over a range of frequencies corresponding to what is expected to occur in. H shuhapt av 7 attorney united states patent 9 vibration damper for transmission lines john h. As a result of vibrations caused by wind, a conductor is subject to variable stresses which determine its durability. Aeolian vibration of transmission lines has been a. Transmission line engineers have sought an easy method for evaluating if external dampers are required on any new transmission line.
How vibration absorber works vibration absorber is applied to the machine whose operation frequency meets its resonance frequency. Conductor is the important carrier of power transmission, and major constituent part of overhead transmission lines. Overhead line spacers add reliability and protection to the conductor bundle, by separating conductors preventing clashing under operating conditions. Reciprocating machines building excited by an earthquake transmission lines or telephone lines excited by wind blowing. Tuned mass dampers are used as stabilizers against harmonic vibration. Aeolian vibration of overhead groundwires is intense in transmission lines located. Our full range of spacers and spacer dampers, including rigid and semi flexible types complete our catalogue range. Dissipator highefficiency stockbridge damper 1700aa series.
Vibration dampers for transmission of mechatronic systems. Vibration and vibration dampers in transmission line. Aeolian vibration basics enml10074 preformed line products. Study of new vibration suppression devices for application to ehv. Damping systems due to wind, overhead transmission lines will be excited to vibrations and oscillations that can lead to damage on the conductor of the overhead transmission line, single parts or the pole. The finite element method fem is employed to investigate windinduced vibration in matlab. Transmission line, groundwire, aeolian vibration, damper, damping wire 1. Aeolian vibration is a low amplitude conductor diameter high frequency 5 to 150 hz phenomenon. Simplified vibration model and analysis of a single. Simplified vibration model and analysis of a singleconductor. Index terms transmission lines, aeolian vibration, stockbridge dampers, laboratory test. As the need for transmission of communication signals increase, many optical ground wiresopwg are replacing traditional ground wires. Study on aeolian antivibration of bundled conductor of. Vibration control of overhead transmission lines kasap, huseyin m.
Radial lines with only one feed are called distribution lines. Ohsw on transmission and distribution lines can produce damage. The tests investigated the an vibration properties of stockbridge dampers at different tension, simultaneous. Conductor vibration induces a relative motion between the clamp and the inertia weights which causes flexure of the steel cable, resulting in dissipation of mechanical. Vibrations dampers are usually used in high voltage and extrahigh voltage electrical energy overhead transmission line to handle aeolian and galloping or dancing vibrations in the transmission lines conductors. Vibration absorber in the transmission lines tuned mass dampers beneath the bridge platform.
Shuhart vibration damper for transmission lines filed sept. Stockbridge damper what is its function in transmission. Sep 12, 2015 conductor tension and nontension joints and clamps, vibration dampers, erection, setting to work, testing and the replacement andor adjustment of defective material and workmanship for the duration of the 12 month warranty period of the transmission line s detailed in the extent of supply. Its function is to balance the vibration of a system with another comparatively lightweight component so as reduce the impact of the worstcase vibrations on the system. Vibration damper in transmission line windinduced vibration of overhead conductors is common worldwide and can cause conductor fatigue near a hardware attachment. The presence of the spacers spacing arms, frame means that the vibrations are reflected at the spacer installation points in. Distribution companies often classify, for overhead lines, stockbridge vibration dampers are for. In existing guidelines or standards,1,2 the wind load is still the key. Mar 20, 2011 vibration damper in transmission line. Windinduced vibration control of power transmission. Abstractaccording to tongtangjia 220kv transmission line in jiangmen, a city in southern china and iec standard, aeolian vibration experiments were designed and conducted in this paper. Chapter 15 dampers, jumpers and clamps a vibration damper is an energy dissipation device for removing the energy of vibration imparted to a conductor by wind. It is a common practice worldwide to use spacer dampers on high voltage overhead transmission lines ohtl involving bundle conductors, in order to withstand possible fatigue failures due to.
Pdf study of new dampers for application to overhead. Aeolian vibration, strouhal frequency, messenger, stockbridge damper, equivalent viscous damping. Us3644660a overhead transmission line and attached. Damping systems spacers and spacer dampers, vibration dampers due to laminar wind, overhead transmission lines will be excited to vibrations and oscillations that can lead to damage on the conductor of the overhead transmission line, single parts or towers. Stockbridge obtained us patent 1675391 on 3 july 1928 for a vibration damper. A new type of damper and its field tests on icecoating. The vibrec damper recommendation program assists in damper requirements for transmission and distribution lines.
In combination with an electrical conductor in a span, a vibration damper comprising a pair of substantially ushaped spring members downwardly depending from said conductor, extending transverse thereto and having their upper ends secured to said conductor, an inertia member aflixed to the free ends of said ushaped members below and in substantial vertical alignment with sad conductor, and means secured to the ends of one of said ushaped members for closing the gap therebetween to prevent. However, if the magnitude of the vibration is high enough, damage in the form of abrasion or fatigue failures will generally occur over a period of time. The damper performance tests for the aeolian vibration of. The transmission lines fatigue failure caused by aeolian vibration is increasingly apparent as the wide. Us2694101a vibration damper for transmission lines. Sep 22, 1978 journal of sotmd and vibration 1978 60 2, 217237 transmission line vibrations m. This innovation reduces the damper s unsuspended weight and cost, while making it more compact. Excessive vibration can result in conductor failure which can be catastrophic. Expired lifetime application number us53619a inventor philip w dulhunty.
These lines are usually stepped down to 8kv or 72kv. First, the fem model was used to develop the equation of motion of the power line conductor. The vibration damper is fixed in the transmission line through the clamp. Pdf spacer damper in transmission line naimatullah. Stockbridge, who was an engineer for southern california edison. Installation instructions fiber optic cable, transmission. The use of vibration dampers alone is no longer sufficient for damping the shortwave conductor vibrations in bundled conductors. Vibration and vibration dampers in transmission line electrical. Assessment inspection methods, diagnostic tools, testing, condition monitoring, life. Sep 06, 2017 windinduced vibration affects the performance and structural integrity of high voltage transmission lines.
The damages caused by aeolian vibration in transmission line 1, such as breakage of conductor strands, insulator strings, and the loosening of parts, have become a problem to be solved, since the largescale development of transmission line. Electranet owns, manages and operates transmission lines at 275kv, 2kv and 66kv. The top countries of supplier is china, from which the percentage of transmission line fitting vibration dampers supply is 100% respectively. Weights made up of cast iron, clamp made up of aluminum alloy, nuts and bolts made up of galvanized or stainless steel and messenger cable made up of galvanized steel. The power transmission tower, which is often a high and flexible structure, is very susceptible to windinduced vibrations. A damper is basically a device which is so designed to.
Index termstransmission lines, aeolian vibration, stockbridge dampers, laboratory test. Comparative testing was conducted in 1993 at a private test site using afl stockbridge dampers and those of two competitors. Pdf dynamic responses and vibration control of the. Study of new vibration suppression devices for application.
The dampers are designed such a way that they attenuate the line vibrations by reaching the same frequency as the cable that has windinduced vibrations. Galloping of transmission lines can cause the weights on stockbridge type vibration dampers to fall off. A damper is basically a device which is so designed to absorbed. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.
Introduction aeolian vibration caused by wake shedding under steady wind conditions is one of the most common forms of vibrations that affect transmission lines. It should be understood that the existence of vibration on a transmission or distribution line doesnt necessarily constitute a problem. A pounding spacer damper and its application on transmission. A vibration damper and transmission line comprising. Online monitoring analysis of aeolian vibration of jiangmen. Apr 26, 2018 stock bridge damper is most popular damper used for prevention of vibration in transmission line. A wide variety of transmission line fitting vibration dampers options are available to you, such as cutting. Vibration damper in transmission line electrical notes. Contribution to the cea workshop on transmission line asset maintenance. Many authors studied the forced vibration of transmission lines using methods based on impedance models. Experiments are performed to determine the equivalent viscous damping of the damper.
Pdf spacer damper in transmission line naimatullah khan. Vibration in transmission line is solved by using specially designed dampers. Aeolian vibration known as windinduced vibration, has a high frequency and smallamplitude motion, which arises from alternating forces caused by vortex shedding. These recorders are used to verify the conductor vibration severity and to confirm that the damping system installed on the transmission line is correct. A device fitted to an engine crankshaft to suppress or reduce the stresses resulting from torsional vibration. Bundled conductor systems are used in overhead transmission lines for highvol tage and extrahighvoltage grids for electrical reasons.
Vibration recommendation form can be found on page 404. Vibration damper transmission line fittings dampers vibration damper hot dip galvanised vibration damper for acsr 397. The stockbridge damper was invented in the 1920s by george h. In order to reduce these vibrations and oscillations to an uncritical dimension, damping systems will have to be installed in the overhead transmission lines. Most overhead lines damped with stockbridge dampers have.
The results as shown in denotes the axial displacement between the two ends of figure 16 demonstrate that the mr dampers can be utilized the friction damper, and is the slip deformation of the on the windinduced vibration control of transmission tower friction damper. The key element of such vibration damper is the ring 2 connected to the principal system 1 with two opposite frames 3. Vibration in overhead conductors is a very serious issue. The key function of a transmission line is to transfer bulk power between generation sources and load centres. Aeolian vibration is a risky problem of overhead transmission lines due to the conductor wire broken off sometimes for it. The switching stations also direct electricity on radial lines to customers. When the transmission line damper vibrates, the damper installed in the transmission line has the upper and lower vibration. Transmission conductor vibration dampers stockbridge type.
Rao department of applied liechanics, indian institute of technology, madras 600036, lndia received 31 august 1977, and hi revised form 23 march 1978 various forms of dampers are used to suppress vibrations in transmission lines. The aeolian vibrations caused in electrical transmission lines due to wind have to be sup pressed. Vibration dampers are widely used to control aeolian vibration of the conductors and earth wires including optical ground wires opgw. They observed that asymmetric stockbridge dampers were more effective at higher modes. Havard, cea workshop on transmission line asset maintenance, session on. It is characterized by high frequency, small amplitude. A wide variety of vibration damper in transmission line fittings options are available to you, such as cutting.
The term transmission lines broadly refers to overhead transmission lines and underground cables. The damper of claim 1 in which said helical rod extends along the line and both sides of said suspender. Windinduced vibrations in overhead transmission lines can damage conductors. Table of contents afl fiber optic cable, transmission. During these vibrations, the power dissipated by the damper is measured by determining various amplitudes of vibration present in the vibrating cable. Study of new vibration suppression devices for application to. Guide for laboratory measurement of the power dissipation characteristics of aeolian vibration dampers for single conductors 4. Vibration dampers are used to absorb aolian vibrations of conductor of transmission lines, as well as ground wire, opgw, and adss. Aeolian vibration is one of the most important problems in transmission lines because it represents the major cause of fatigue failure of conductor strands or of items associated with the support, use, and protection of the conductor.
These lines can either go directly to a large industrial customer ipsco or to a substation. Improper installation can result in mechanical failure of the cable system and possible injury to persons handling or in the vicinity of the cable systems. Spacer dampers subspan oscillation recorder vr500 pt fatigue type testing of a quad spacer. Vibration damping required for overhead lines ieee journals. This is generally due to a fatigue failure of the messenger strand. Aug 04, 2015 simplified vibration model and analysis of a singleconductor transmission line with dampers o barry1, r long1 and dcd oguamanam2 abstract a novel model is developed for a vibrating singleconductor transmission line carrying stockbridge dampers. Vibration dampers on aac and aaac conductors cired. Article information, pdf download for simplified vibration model and analysis.
Glyn havard published vibration dampers, by david g. Transmission wire vibration problem solve in hindi damper use in electrical system types of damper electrical dosti am aayush sharma welcome to our you. You can also choose from y transmission line fitting vibration dampers there are 109 suppliers who sells transmission line fitting vibration dampers on, mainly located in asia. To reduce the vibration of a primary device by adding an absorber to the system applications. In addition, dampers, conditions for damping, free and forced vibrations of the overhead conductor.
Vibrations should be kept within limits for safe operation of the transmission lines. Windinduced vibration of overhead conductors is common worldwide and can cause conductor fatigue near a hardware attachment. Pdf aeolian vibration of overhead groundwires is intense in transmission lines located in flat and windy areas. You can also choose from y transmission line fitting vibration dampers there are 109. His patent described three means of damping vibrations on lines. Wind causes a variety of motions on transmission line conductors.
Transmission conductor vibration dampers dissipator highefficiency stockbridge damper cont. Standard for the measurement of audible noise from overhead transmission lines 3. Design and testing of stockbridge vibration dampers. Table of contents fiber optic cable, transmission and. Why damper use in transmission line electrical engineering. Transmission line general requirements including typical. The steel strand wire connected to the hammerhead bends up and down because of inertia of the hammerhead. Stock bridge damper consists of two hollow weights of special shape fixed at either end of length of line and fastened to the line by aluminum clamp. They must be placed at the peak of a wave distance from insulator varies with conductor to work properly.
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