Overhead transmission lines form a catenary for which vibration is predominately in the vertical. The purpose of the guideline is to guarantee satisfactory performance of the vibration dampers during the lifetime of the overhead transmission line and shall be used for the purchase of vibra tion dampers. Mar 20, 2011 vibration dampers are widely used to control aeolian vibration of the conductors and earth wires including optical ground wires opgw. Dec 10, 2017 vibration dampers are widely used to control aeolian vibration of the conductors and earth wires including optical ground wires opgw. How does a small size damper reduce vibration in the. Vibration control of overhead transmission lines kasap, huseyin m. The invention provides a stockbridge vibration damper comprising a pair of damping weights joined by a stranded steel cable, a clamp attached to the cable at a location intermediate the weights for attachment to an overhead power transmission line. Vibration damper for overhead power lines dulhunty power.
Aeolian vibration is one of the most important problems in transmission lines because it represents. The invention provides a stockbridge vibration damper comprising a pair of. Vibration damper in transmission line vibration damper in. Construction maintenance and repair liveline barehand annotated instructors guide module overview this module introduces trainees to tasks in the power transmission environment that are. This product is intended for use by trained craftspeople only. Ribe vibration dampers remove the wind energy from the conductor and reduce vibration stresses sufficiently to ensure a long life for the overhead transmission lines. Most overhead lines damped with stockbridge dampers have satisfactory performance. Experiments are performed to determine the equivalent viscous damping of the damper. Research advances of aeolian vibration of damperline. Vibration and vibration dampers in transmission line.
The vibration level is evaluated by determining the balance between the. Vibration in transmission line is solved by using specially designed dampers. Vibrations dampers are usually employed to handle aeolian, gallop and wakeinduced vibrations in the transmission lines. A vibration damper and transmission line comprising. Stockbridge dampers installed on high voltage power lines. Vibration minimisation by this method can only be considered for systems with a single frequency of excitation. 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. 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. Wind induced aeolian vibrations of conductors and overhead shield wires ohsw on transmission and distribution lines can produce damage that will negatively impact the reliability or serviceability of these lines.
About 3% of these are power distribution equipment, 77% are power accessories. Aeolian vibration is a low amplitude conductor diameter high frequency 5 to 150 hz phenomenon. The lines are simulated by cable element, the dampers by mass element and beam. Jun, 2014 dampers used in electrical transmission lines slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Control of vibration of transmission lines article pdf available in international journal of acoustics and vibrations 152. The damper is designed to dissipate the energy of oscillations in the main cable to an acceptable level. Simplified vibration model and analysis of a singleconductor transmission line with dampers o barry, r long, and dcd oguamanam proceedings of the institution of mechanical engineers, part c. Aeolian vibrations occur almost on any transmission line, for low to moderate steady winds.
Mmpt iron vibration damper, rs 310 piece mm powerline. Study of breeze vibration of overhead transmission lines with. The conductor galloping is a selfexcited vibration caused by wind excitation to iced transmission line conductors which leads to strand break and wire break due to conductor fatigue and. Request pdf on aug 31, 2018, sooman park and others published vibration characteristics of stockbridge damper for transmission line find, read and cite all the research you need on researchgate. They are characterised by small amplitudes of vibration one conductor diameter with frequency between 5 and 100 hz, depending on the conductor size and tensile load. Energy balance method ebm is another method used to examine the forcedvibration analysis of transmission lines. And iee standard is a good way to verity the damper performance. Vibration damper in transmission line electrical notes. A vibration damper for an overhead cable having a cshaped cushioned elastomer lined suspender engaging the cable and a vibration damper suspended below it. Journal of vibration and control on the vibration analysis of.
Reciprocating machines building excited by an earthquake. The purpose of the guideline is to guarantee satisfactory performance of the vibration dampers during the lifetime of the overhead transmission. Aug, 2017 vibrations dampers are usually employed to handle aeolian, gallop and wakeinduced vibrations in the transmission lines. Pdf study of new dampers for application to overhead. A stockbridge damper is a tuned mass damper used to suppress windinduced vibrations on slender structures such as overhead power lines and long cantilevered signs. Vibration dampers are used to absorb aolian vibrations of conductor of transmission lines, as well as ground wire, opgw, and adss. Index termstransmission lines, aeolian vibration, stockbridge dampers, laboratory test. Aeolian vibration, transmission line vibration, overhead conductors, vibration dampers. The dynamic damper uses the inherent phase shift of resonance to provide a mass that will absorb energy from the vibrating system and thereby reduce amplitudes. Aeolian vibration of overhead electrical transmission lines, also referred to as conductors, are very common and can lead to fatigue damage. This invention relates to the design and manufacture of stockbridge type vibration dampers for overhead power transmission lines. Request pdf vibration damper in transmission line vibration damper in transmission line windinduced vibration of overhead conductors is common worldwide and can cause conductor fatigue. Aeolian vibrations are usually caused by winds ranging in. The lines are simulated by cable element, the dampers by mass element and beam element.
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. To reduce the vibration of a primary device by adding an absorber to the system applications. When working in the area of energized lines with this. Transmission conductor vibration dampers stockbridge type. Final feasibility update report casa update f2 02094srp030001 f. As shown in the figure they are fitted at a position most effective in damping the. Overhead transmission lines form a catenary for which vibration is predominately in the vertical plane. Simplified vibration model and analysis of a singleconductor. Rao department of applied liechanics, indian institute of. Dampers are used both in the phase and ground conductors.
Stock bridge damper is most popular damper used for prevention of vibration in transmission line. Comparative testing was conducted in 1993 at a private test site using afl stockbridge dampers and those of two competitors. Energy balance method ebm is another method used to examine the forced vibration analysis of transmission lines. Overhead transmission lines vibrationdampers svenska kraftnat.
If you continue browsing the site, you agree to the use of cookies on this website. Documents for the proposal the bidder will submit together. The damper of claim 1 in which said helical rod extends along the line and both sides of said suspender. As the need for transmission of communication signals increase, many optical ground wiresopwg are replacing traditional ground wires. The dampers are so designed that they attenuate the line.
Conference paper pdf available october 1998 with 728 reads. Ohsw on transmission and distribution lines can produce damage that will negatively impact the reliability or serviceability of these lines. The vertical, steadystate breeze vibration of transmission line with dampers attached are studied using fem analysis. In recent years, aaac conductor has been a popular choice for transmission lines due to its high electrical carrying capacity and high mechanical tension to mass ratio.
As shown in the figure they are fitted at a position most effective in damping the vibration. Aeolian vibration known as windinduced vibration, has a high frequency and smallamplitude motion, which arises. In recent years, aaac conductor has been a popular. Vibrec damper recommendation program the vibrec damper recommendation program assists in damper requirements for transmission and distribution lines. Research advances of aeolian vibration of damperline system.
Jiangmentongtangjia 220kv transmission line which distance from the coastline in the range of 5km. This product should not be used by anyone who is not familiar with and trained in the use of it. Lines damaged by vibration may have to be derated or even taken out of service until repairs can be made. Online monitoring analysis of aeolian vibration of jiangmen. Documents for the proposal the bidder will submit together with his offer the following documents from the manufacturer. The degree of protection needed on a specific line depends upon a number of factors such as line design, temperature, tension, exposure to wind flow, and vibration history on similar construction in the same area. Mm powerline transmission offering mmpt iron vibration damper at rs 310piece in howrah, west bengal. A stockbridge vibration damper is a seismic device used for damping overhead power transmission lines. Vibration dampers are widely used to control aeolian vibration of the conductors and earth wires including optical ground wires opgw. Apr 26, 2018 vibration in transmission line is solved by using specially designed dampers.
The analytical expression of the kinetic energy of the cable is compared with the. The requirements of transmission lines tend to be higher and softer which make the diameter of wire diameter and span larger, transmission line suspension points. Vibration damper in transmission line divyas blog for. Stockbridge dampers in the shape of dumbbell with midpoint clamped to the line are used for damping the aeolian vibration. Afl vibration dampers may be installed without disassembly of the clamp parts. Study on aeolian vibration of overhead conductors with dampers. Vibration characteristics of stockbridge damper for. Technical guideline for vibration dampers with preformed helical rods for overhead earth wire, see tr 05092e. Sep, 2005 a stockbridge vibration damper is a seismic device used for damping overhead power transmission lines. The authors emphasize the importance of choosing appropriate design tension, type, quantity and placement of vibration dampers to avoid failure of lines. Stockbridge vibration dampers comprise of a pair of weights joined by a stranded. Windinduced vibration of overhead conductors is common worldwide and can cause conductor fatigue near a hardware attachment. The data got from the monitoring of a6 and a7 tower to analysis the aeolian vibration situation, and.
On the vibration analysis of power lines with moving dampers ma bukhari1, o barry1 and e tanbour2 abstract this work investigates the performance of a moving damper for overhead transmission lines. Feb 22, 1972 a vibration damper and transmission line comprising. They are characterised by small amplitudes of vibration one conductor diameter with frequency between 5. But transmission line and damper system cannot completely protect the lines from the destruction of aeolian vibration. 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. Journal of sotmd and vibration 1978 60 2, 217237 transmission line vibrations m. The free vibration of a transmission line conductor equipped with a number of stockbridge dampers is modelled by a differential equation of motion of a tensioned beam acted on by concentrated frequency. 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.
This provides maximum effectiveness in controlling the levels of subconductor motions. Spiral vibration dampers are also effective on certain size overhead. The dumbbellshaped device consists of two masses at the ends of a short length of cable or flexible rod, which is clamped at its middle to the main cable. Apr 19, 2019 apr 19, 2019 wazipoint is an engineering blog. Aeolian vibration is a low amplitude conductor diameter high frequency 5 to 150. Stockbridge vibration dampers comprise of a pair of weights joined by a stranded steel cable commonly known as a messenger cable and a clamp attached to the cable at a location intermediate the weights for attachment to an overhead. The dampers are so designed that they attenuate the line vibrations by reaching the same frequency as the cable that has wind. The free vibration of a transmission line conductor equipped with a number of stockbridge dampers is modelled by a differential equation of motion of a tensioned beam acted on by concentrated frequency dependent forces, and an exact solution is obtained using integral transformation. The vibration level is evaluated by determining the balance between the energy imparted to the conductor by the wind and the energy dissipated by the conductor via conductor selfdamping and the added dampers. In recent years, aaac conductor has been a popular choice for transmission lines due to its high electrical carrying capacity and high mechanical. Dampers used in electrical transmission lines slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. When more than one plane of vibration is anticipated, stockbridge dampers may be mounted at right angles to each other. A damper is basically a device which is so designed to absorbed vibration energy and prevent vibration in transmission line. Stockbridge dampers are devices extensively used to reduce vibration amplitude on electric.
This new transmission concept shows how enjoyment, consumpti on and comfort can be combined with impressive results. Study of new vibration suppression devices for application to ehv. There are thus normally two dampers per span, though more can be installed if necessary on longer spans. Vibration dampers are used to absorb aolian vibrations of conductor of transmission lines. Us6943290b2 vibration damper for overhead power lines. In any conductor the dampers are used at both the ends of the span. The damper performance tests for the aeolian vibration of. Helical rods are wrapped around the cable and suspender to hold the suspender in place. Modern spacer dampers are characterized by an accurate coordination between the inertial and elastic damping properties. This paper is a resume of available data concerning the causes of and remedies for wire failure in overhead line conductors subject to the eddy vibration due to steady winds ranging from 5 to 25. The vibrec damper recommendation program assists in damper requirements for transmission and distribution lines.
Aeolian vibration of overhead groundwires is intense in transmission lines located. Pdf aeolian vibration of overhead groundwires is intense in transmission lines located in flat and windy areas. A damper is basically a device which is so designed to absorbed vibration energy and prevent vibration in. Keywords aeolian vibration, transmission line vibration, overhead conductors, vibration dampers 3. Vibration dampers are used to absorb aolian vibrations of conductor of transmission. Construction maintenance and repair liveline barehand. Valid iso 9001 certificate, as defined in the threshold conditions. Construction maintenance and repair liveline barehand annotated instructors guide module overview this module introduces trainees to tasks in the power transmission environment that are often conducted while lines and components are live, performed with intentional contact between the worker and the energy source. The authors emphasize the importance of choosing appropriate design tension, type, quantity and placement of vibration dampers. Lines damaged by vibration may have to be derated or even. Karman vortex street ribe vibration dampers effective protection against conductor vibrations. Dampers are also used as supplemental protection at deadends.
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