Overhead-line oscillations and the effect of aerodynamic dampers

Hunt, J. C. R.; Richards, D.

doi:10.1049/piee.1969.0344

Cited by 20 publications

(5 citation statements)

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“…Based on the energy balance method, Hunt and Richards gave a simplified formula for calculating the amplitude (peak-peak) of conductor galloping (Hunt and Richards, 1969):…”

Section: Analysis Of Conductor Tension Tension Change In the Process ...mentioning

confidence: 99%

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

et al. 2022

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In this article, the numerical model of the multi-span iced eight-bundle conductor is established using the nonlinear finite element method, the galloping of the line under different parameters is simulated, and the tension in the galloping process is analyzed. Based on the aerodynamic characteristics and galloping characteristics of conductors, the galloping modes, frequency characteristics, vibration amplitudes, and galloping orbits of multi-span lines under different wind velocities, span lengths, ice shape, and number of spans are analyzed, compared with those of single-span lines. It is demonstrated that there are differences in galloping characteristics between multi-span transmission lines and single-span lines. Each span of the transmission line is different, so it should be fully considered in the research of galloping prevention and control technology.

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“…Based on the energy balance method, Hunt and Richards gave a simplified formula for calculating the amplitude (peak-peak) of conductor galloping (Hunt and Richards, 1969):…”

Section: Analysis Of Conductor Tension Tension Change In the Process ...mentioning

confidence: 99%

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

et al. 2022

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“…Many different approaches can be found in literature to simulate ice-galloping on bundle conductors, the most of them using Finite Element Modelling (FEM) to reproduce the structural part of the system (single of multi-span sections of the transmission Line) and relying on the Quasi Steady Theory (QST) to reproduce the fluid-elastic forces [7] [8].The QST uses the static lift, drag and moment coefficients of the bundle with ice formation on the conductors measured in wind tunnel as a function of the angle of attack of the wind. This approach can be very useful to define what kind of device can be used to control the different types of instabilities that may occur: onedegree-of-freedom or Den Hartog instability and two-degrees of freedom or flutter type instability.…”

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confidence: 99%

“…It has to noted that -as reported in the EPRI Orange Booksome attempts to compute in an easy way the maximum amplitudes of ice-galloping as a function of the wind speed have been already made [7] [8]. All of these methods are mainly based on very simple formulations that cannot take into account all the complexity of the problem, especially when the type of instability is due to the combination of torsional and vertical modes of vibration, as mainly occurs in bundle conductors.…”

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confidence: 99%

Energy Method to Compute the Maximum Amplitudes of Oscillation Due to Galloping of Iced Bundled Conductors

Diana

Manenti

Melzi

2021

IEEE Trans. Power Delivery

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The paper presents a modal model to describe the interaction between a 4-conductor bundle and wind. A finiteelement model of the bundle is used to perform a linear analysis, to extract mode shapes and natural frequencies of the system. The motion of the expanded bundle is then described through mode coordinates representing the first horizontal, vertical and torsional modes. Wind tunnel tests were performed adding templates over the cables to mimic the presence of ice over the same conductor bundle; tests allowed to characterize the aerodynamic coefficients of the entire bundle and provided data for the model validation. The model was then applied to a case study to predict the maximum oscillations produced by ice galloping. Time-domain simulations were used for the purpose, together with an alternative approach named energy method; this last directly estimates the amplitude of limit cycles avoiding the integration of the equations of motion and can be much more useful from the engineering point of view.

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“…The analytical model was checked versus the results of a wind tunnel experiment. The amplimdes used in the analytical model were calculated using the equation developed by Hunt and Richard [48] (see Equation 2.7). Not all of the presented experimental results were very close to the results calculated using the analytical model.…”

Section: Loads Generated By Gallopingmentioning

confidence: 99%

Development of computer software for simulation of transmission line dynamic behavior

Nafie

Mohamed²

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CHAPTER 1-INTRODUCTION 1 1.1 Background 1 1.2 Objective 2 1.3 Methodology 2 CHAPTER 2-LITERATURE REVIEW 4 2.1 The Cable Element 4 2.1.1 Theoretical Analysis of Cables 4 2.1.2 Numerical Analysis of Cable Elements 8 2.2 Broken Conductor Analysis 9 2.2.1 Experimental Studies of Broken Conductors 9 2.2.2 Analytical Analysis of Broken Conductors 2.3 Broken Insulator Analysis 11 2.4 Conductor Galloping 2.4.1 The Galloping Phenomena 2.4.2 Modeling Galloping using Analytical Methods 2.4.3 Modeling Galloping using Statistical Methods 2.4.4 Loads Generated by Galloping 2.5 Object Oriented Progranuning 20 2.5.1 Benefits of Object Oriented Programming 20 2.5.2 Using Object Oriented Programming in Structural Analysis Software 21 iv 2.5.3 Efficiency Issues in Object Oriented Programs 23 CHAPTER 3-DESIGN OF THE SIMULATION SOFTWARE 24 3.1 Overview of Object Oriented Programming 24

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Overhead-line oscillations and the effect of aerodynamic dampers

Cited by 20 publications

References 0 publications

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

Energy Method to Compute the Maximum Amplitudes of Oscillation Due to Galloping of Iced Bundled Conductors

Development of computer software for simulation of transmission line dynamic behavior

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