Transmission line reference book wind induced conductor motion pdf

Design codes, standards, and manuals used in power line. Sep 21, 2015 electric power research institute, transmission line reference book, wind induced conductor motion, research project 795, 1978 5. The fact that the vortex frequency for an ohsw is much higher than that for a. Wind induced conductor motion electric power research institute, et al on. Pdf study of new dampers for application to overhead. Epri underground transmission systems reference book 2010 update ut workstation 2010 version 5. This is the most common type of vibration that results due to vortex shedding under laminar flow of wind.

Experiments are performed to determine the equivalent viscous damping of the damper. A novel model is developed for a vibrating single conductor transmission line carrying stockbridge dampers. Effect of ice and snow on the dynamics oftransmission. Windinduced conductor motion, the orange book, which was last issued in 1979.

In most of the transmission lines the conductor selfdamping mechanism is insuffi. To help utilities diagnose and solve conductor motion issues, epri has updated the longtime industry standard epri transmission line reference book wind induced conductor motion 1012317, known to. Galloping is one type of critical windinduced oscillation of slender structures with noncircular crosssections. Wind tunnel test investigation on unsteady aerodynamic. Sagtension calculation methods for overhead lines, cigre brochure 324, task force b2. Effect of motion path of downburst on wind induced. Hon tat hui transmission lines basic theories nusece ee2011 28 example 1 a 100.

Based on a revised analytical model recently developed for stationary downburst and harmonic superposition method, transient threedimensional wind fields of downbursts were successfully simulated. Blowout refers to the magnitude of the horizontal displacement of a conductor, due to wind. Effect of ice and snow on the dynamics oftransmission line. Problems in overhead transmission line linkedin slideshare. Simplified vibration model and analysis of a singleconductor. Wind excited vibrations generated by vortex shedding are very common in highvoltage overhead transmission lines.

Article information, pdf download for simplified vibration model and. Pdf updating the epri transmission line reference book. The general arrangement used for the self damping test is shown in figure 1. Davenport, a novel approach for wind tunnel modelling of transmission lines, journal of wind engineering and industrial aerodynamics, vol. Wind induced conductor motion the orange book 2009 edition. Electric power research institute epri, transmission line reference book, wind induced conductor motion, palo alto, california, 1979. Yellow book overhead transmission inspection and assessment guidelines 7. A stockbridge damper is a tuned mass damper used to suppress wind induced vibrations on slender structures such as overhead power lines and long cantilevered signs. Epri transmission line reference bookwindinduced conductor motion. Epri transmission line reference book wind induced conductor motion. Cfd numerical simulation of aeolian vibration of single.

The wind induced motion of the overhead line conductor with the above mentioned crosssection was simulated. Wind induced conductor motion, project 792, palo alto, ca, 2006. A complementary document to transmission line reference book windinduced conductor motion. Antigalloping potential of a new twisted conductor design, proceedings of the canadian electrical association, international symposium on overhead conductor dynamics, pp.

This damper is then reduced to an equivalent discrete massspringmass and viscous damping system. Design and testing of stockbridge vibration dampers. Wind induced conductor motion, electric power research institute, palo alto, ca, 1979. Aluminum electrical conductor handbook, third edition, aluminum association, 1989. Free vibration analysis of a single conductor with a stockbridg damper jun 2011.

Wind induced conductor motion, an epri transmission line reference book, epri project 792, 1979 ieee standard for calculating the currenttemperature relationship of bare overhead conductors, ieee std. Wind induced conductor motion, the orange book, which was last issued in 1979. Aeolian vibration basics enml10074 preformed line products. Allowable tension levels for overheadline conductors. Overview of the transmission line design process sciencedirect. Modeling and mechanism of rainwind induced vibration of. Some effects of mill practice on the stressstrain behavior of acsr. The stationary aerodynamic coe cients of the typical conductor crosssection were calculated by vvd method and approximated by smooth curves. These are low amplitude medium frequency 3 60 hz for wind speeds of 18 ms. This paper deals with the problem of wind induced oscillations, of the leeward conductor caused by the wake of the windward conductor, for twinbundled overhead transmission lines. Blowout blowout is the most basic conductor motion. Mchugh, wind tunnel investigation of conductors vibration using rigid models, ieee transaction paper, october 1956, pp. Epri publications request archive petroleum community forum. The test was carried out in a temperaturecontrolled laboratory at 22.

Mechanics of overhead electrical conductors under wind excitation is a complex problem. Transmission line reference book, wind induced conductor motion, chapter 4, electric power research institute. By john chan, dave havard, chuck rawlins, giorgio diana, louis cloutier, jeanlouis lilien, claude hardy, jeff wang and anand goel. Ieee std 6641993, ieee std 5631978 and the transmission line reference book windinduced conductor motion, epri 1979. Study of new vibration suppression devices for application to ehv. Wind induced conductor motion, an epri transmission line reference book, epri project 792, 1979. Although such vibrations are barely perceptible due to their low amplitudes less than a conductor diameter, they are, however, extremely important since they may lead to conductor fatigue.

These guidelines are applicable to stockbridge type vibration dampers which will be used on steel reinforced aluminium and aluminium alloy conductors according to svk. The main characteristics and effect of the wind induced conductor motions are. State of the art of conductor galloping a complementary document to transmission line reference book windinduced conductor motion chapter 4. To reveal the mechanism of rain wind induced vibration of bundled conductors, a series of. Rawlins cb, hard ar, ikegami r, doocy es 1979 transmission line reference book windinduced conductor motion. Windinduced conductor motion orange book, epri, palo alto. Analyses of the vibration level of an opgw at the catenary. Updating the epri transmission line reference book. Observation of transmission lines galloping shows that iced conductor motion occurs in the wind velocity from 4 ms to 20 ms in most cases. Wind tunnel test research on aerodynamic characteristics. Dynamic analysis of an overhead transmission line subject to gusty wind loading predicted by windconductor interaction.

Reworked by an international team of experts, this new edition. Concept of wind induced oscillations oscillations in conductors occur due the following phenomena. Quasisteady simulation was performed until time moment t 180 s, then unsteady. Wind induced conductor motion,electric power research institute, palo alto, ca, 2006. The orange book reworked by an international team of experts, this new edition provides an essential resource for all utilities involved in transmission line design and maintenance. Lilien, jeanlouis belgium convenor van dyke, pierre canada secretary asselin, jeanmarie canada. Composite technology corporation 2026 mcgaw avenue irvine, ca. Wind induced conductor motion ac transmission line reference book 200 kv and above, third edition. Under the certain rain wind conditions, bundled conductors exhibit a rain wind induced largeamplitude vibration. For example, the vortex frequency for a 795 kcmil 267 acsr drake conductor under the influence of an 8 mph wind is 23. Reliable transmission line design requires that sustained and not sustained con.

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. Following is a summary and comparison of aeolian, gallop, and wakeinduced oscillation, reproduced from epri transmission line reference book, windinduced conductor motion, based on epri research project 792. Teal book best practices and life extension guidelines for substations. Wind induced conductor motion epri electric power transmission. Effect of temperature on galloping of iced conductors guo. One of the major challenges faced by electric utilities and. This type of vibration can cause the fatigue fractures of conductors and fatigue failures of spacers, which threaten the safety operation and serviceability of highvoltage transmission line. Epri has published a new, updated edition of the longtime industry standard on vibration, epri transmission line reference book. Hagedorn, on the computation of damped wind excited vibrations of overhead transmission lines, journal of sound and vibration. State of the art of conductor galloping a complementary document to transmission line reference book wind induced conductor motion chapter 4. The damper is designed to dissipate the energy of oscillations in the main. A 38 ohsw under the same 8 mph wind will have vortices alternating at 72. Conductor galloping, based on epri research project 792 task force b2.