Experimental and numerical study on the responses of a transmission tower to skew incident winds

Deng, Hongda; Xu, Hongjun; Duan, Chao; Jin, Xiang; Wang, Z.H.

doi:10.1016/j.jweia.2016.05.010

Cited by 37 publications

(15 citation statements)

References 28 publications

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“…For a real tower structure, the wind may approach from any direction; thus, the wind attack angle can be expected to change with the wind direction. Different wind attack angles can lead to different load distributions in the two horizontal directions, which will result in different responses . Thereby, it is essential to address the influence of the wind attack angle on the strength capacity and failure pattern for transmission towers.…”

Section: Analytical Resultsmentioning

confidence: 99%

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Wang

2019

Structural Design Tall Build

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Summary Many transmission towers have collapsed during severe gales and thunderstorms, and these failures have traditionally been attributed simply to wind loading. This study attempts to reveal the full failure mechanism of tower structures under strong wind excitation considering the rainfall effect. First, the calculation of rain load for a tower‐line system is provided. Then, an uncertainty analytical method for estimating the strength capacity and predicting the failure pattern of transmission towers induced by wind and rain loads is presented. Next, a real collapsed transmission line is considered to establish the finite element model, followed by the determination of the most vulnerable tower, which is then used to perform the uncertainty analysis. The results illustrate that the collapse basic wind speed considering the rainfall effect is smaller than the pure wind condition. In addition, the failure probability of the tower body is the largest, which is consistent with the deterministic method, whereas the most vulnerable tower began to fail from the tower leg in reality, indicating that the initial broken position of the transmission tower may not occur in the location with the largest probability and that the deterministic method is invalid in some cases. Finally, the influence of the wind attack angle and bundle number of transmission conductor is investigated. The most unfavorable wind attack angle is 90°, and the rainfall effect becomes increasingly significant with increases in the bundle number; this relationship should be given particular attention.

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Section: Analytical Resultsmentioning

confidence: 99%

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Wang

2019

Structural Design Tall Build

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“…In the first part, the 10 min average wind speed at 10 m height was simulated using the YanMeng typhoon model that was dynamically Numerous studies across the world have made their contributions to this area. Deng and Yang tried to study the response of a tower-line system under wind conditions through numerical simulation [2,3]. An's research based on numerical simulation considered both wind and rain effect [4,5].…”

Section: The Proposed Methodsmentioning

confidence: 99%

Research on Windage Yaw Flashovers of Transmission Lines under Wind and Rain Conditions

An¹,

Guan

Zhu

et al. 2019

Energies

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Windage yaw flashovers under strong wind and rain conditions leave a negative impact on the safe operation of transmission lines. However, the mechanism behind this is not well known yet. Therefore, this paper proposes a systematic method, including three basic parts described as simulation of wind and rain loads, calculation of windage yaw, and flashover analysis, to analyze windage yaw flashovers of transmission lines. The YanMeng-particle swarm optimization (YanMeng-PSO) algorithm is proposed to enhance the simulation accuracy. Unlike the conventional approach, the windage yaw status of conductors and insulator strings is dynamically described with key nodes and the breakdown voltage of their clearances rather than windage yaw angle. Furthermore, in the second part, a new method named key-node method (KNM) is proposed to calculate the conductors’ windage yaw. Moreover, the rain effect is also considered in this paper. This paper then presents a case study on a 110 kV double-circuit transmission line section that suffered severe collapse when the typhoon Rammasun landed in Hainan island. Particular focus was placed on the windage yaw flashover before the structural failure of the transmission line. The results validated the significant rain effect and found that conductors/ground suffer more severe windage yaw flashover than insulator strings. Finally, constructive solutions such as interphase spacers, reasonable conductor arrangement in the design phase, and regular measurements and adjustments of conductor sag in the maintenance phase are proposed to improve the design of transmission lines to enhance their capacity against windage yaw flashovers.

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“…Consider a power transmission line experiencing a vertical force, curvature and an axial force has an axial displacement modeled in Eq. (49) as [21]:…”

Section: Fem Matlab Model Setup Formulation and Implementationmentioning

confidence: 99%

“…The models were used to determine how wind loading influenced the oscillation of transmission lines. This form of investigation was done by experimental studies carried out in a wind tunnel [21,22]. The outcomes of these experiments were used to determine conductor input loading.…”

Section: Introductionmentioning

confidence: 99%

High Voltage Transmission Line Vibration: Using MATLAB to Implement the Finite Element Model of a Wind-Induced Power-Line Conductor Vibration

Onunka¹,

Ojo²

2018

MATLAB - Professional Applications in Power System

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Wind-induced vibration affects the performance and structural integrity of high voltage transmission lines. The finite element method (FEM) is employed to investigate windinduced vibration in MATLAB. First, the FEM model was used to develop the equation of motion of the power line conductor. In addition, dampers, conditions for damping, free and forced vibrations of the overhead conductor were considered in the FEM model. Wind-induced experiments were conducted in the laboratory using an actual overhead power conductor. The developed FEM models were simulated in the MATLAB computing environment. The results from the MATLAB simulation, finite element and experimental recordings were compared in order to evaluate the efficacy of models simulated in MATLAB and developed using the FEM.

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Experimental and numerical study on the responses of a transmission tower to skew incident winds

Cited by 37 publications

References 28 publications

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

Research on Windage Yaw Flashovers of Transmission Lines under Wind and Rain Conditions

High Voltage Transmission Line Vibration: Using MATLAB to Implement the Finite Element Model of a Wind-Induced Power-Line Conductor Vibration

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