Wind-induced failure analysis of a transmission tower-line system with long-term measured data and orientation effect

Bi, Wenzhe; Tian, Li; Li, Chao; Ma, Zhen; Pan, Haiyang

doi:10.1016/j.ress.2022.108875

Cited by 27 publications

(3 citation statements)

References 40 publications

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“…The vibration response-based wire tension state monitoring system studied in this paper has a promising application prospect and can be applied to various lines that currently receive high attention from State Grid. For example, threespan lines severely affected by traffic loads, related lines in heavy ice areas prone to wire de-icing jumping, and lines in strong wind areas prone to wire dancing and wind deflection [32]. The wire tension state monitoring method proposed in this paper is a wire health monitoring method that considers factors such as accuracy, real-time performance, ease of operation, and economy.…”

Section: Engineering Pilot Applicationmentioning

confidence: 99%

Research on online monitoring method for time-varying tension in transmission lines based on operational modal response

Liu,

Zhao,

Wen

et al. 2024

Meas. Sci. Technol.

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The cumulative overload of conductor tension under severe weather conditions is an important cause of accelerated fatigue fracture of transmission lines. Traditional tension measurement methods require the replacement of ball head hanging rings, which poses safety risks. In this paper, a method for monitoring conductor tension based on acceleration data under operating conditions is proposed. Firstly, a modal order extraction based method for identifying the modal frequencies of conductor operation is proposed, and then the time-varying tension of the conductor is estimated based on the instantaneous modal frequencies. Since this method directly installs sensors on the conductor, there is a certain error in the obtained intrinsic characteristic data of the conductor. Therefore, a modal correction method is used to remove the influence of the sensors. The accuracy of modal identification, modal correction, and tension identification methods is verified through finite element models. Based on the above methods, a monitoring system for conductor tension status is designed, and the feasibility of this system is verified through experiments. Finally, the vibration data obtained from the field engineering pilot test is successfully used for conductor tension analysis. The results show that the proposed method can effectively identify time-varying tension and provide a new approach for monitoring the status of transmission line conductors.

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Section: Engineering Pilot Applicationmentioning

confidence: 99%

Research on online monitoring method for time-varying tension in transmission lines based on operational modal response

Liu,

Zhao,

Wen

et al. 2024

Meas. Sci. Technol.

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“…When these excitations propagate to the endpoint, they generate reflected waves that interact with propagating waves, ultimately leading to increased amplitude and vibration instability. It is worth noting that previous literature has also addressed similar factors [25,26].…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Wind Field Digital Twins Sandbox System for Transmission Towers

Zhang,

Li,

Feng

et al. 2023

Sensors

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Given the digitalization trends within the field of engineering, we propose a practical approach to engineering digitization. This method is established based on a physical sandbox model, camera equipment and simulation technology. We propose an image processing modeling method to establish high-precision continuous mathematical models of transmission towers. The calculation of the wind field is realized by using wind speed calculations, a load-wind-direction-time algorithm and the Continuum-Discontinuum Element Method (CDEM). The sensitivity analysis of displacement- and acceleration-controlled transmission tower loads under two different wind direction conditions is conducted. The results show that the digital model exhibits a proportional relationship with the physical dimensions of the transmission tower model. The error between the numerical simulation results and the experimental results falls within a reasonable range. Nodes at higher positions of the transmission tower experience significantly higher forces compared to those at lower positions, and the structural forms with larger windward projected areas yield similar simulation results. The proposed digital twin system can help monitor the performance of structural bodies and assess the disaster degree in extreme conditions. It can guide specific maintenance and repair tasks.

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“…The procedure is intuitive and the calculation speed is the biggest advantage of this method. [4] However, many reports [5] pointed out that the safety coefficient of the static analysis is not precise enough, the static calculation result is sometimes unreasonable, and the simplified mode needs to be further studied. Reliability analysis can solve these problems and has become an important method for the safety assessment of transmission tower structures.…”

Section: Introductionmentioning

confidence: 99%

Structural Safety Assessment of the Transmission Tower Using Bayesian Network

Sun,

Ou,

et al. 2024

ACETR

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To clarify the disaster-causing factors and preventive measure for the transmission tower, a structural safety assessment method based on Bayesian network is proposed in this study. Firstly, various disaster-causing factors triggering structural damage of transmission towers are systematically analyzed, and three layers network model is constructed based on Bayesian causality. And then, the a priori probability and conditional probability of the network model are quantitatively calculated by combining expert scoring and fuzzy theory. A connectivity tree is formed by building a doxastic map and eliminating elements of the Build Constructive Tree (BuildCT) algorithm. Finally, forward and backward reasoning algorithm using the monitoring data is implemented to capture probabilities of disaster-causing and resulting factors for maintenance. Results shows that the possibility of wind bias tripping is the most feasible factor to be triggered under specific meteorological conditions condition, which is in line with expectation of experts. And strong winds and Serious icing are the key causative factors for tower disconnection and excessive deformation.

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Wind-induced failure analysis of a transmission tower-line system with long-term measured data and orientation effect

Cited by 27 publications

References 40 publications

Research on online monitoring method for time-varying tension in transmission lines based on operational modal response

Research on online monitoring method for time-varying tension in transmission lines based on operational modal response

Wind Field Digital Twins Sandbox System for Transmission Towers

Structural Safety Assessment of the Transmission Tower Using Bayesian Network

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