Study on jump height of transmission lines after ice-shedding by reduced-scale modeling test

Huang, Guizao; Yan, Bo; Wen, Nan; Wu, Chuan; Li, Qing

doi:10.1016/j.coldregions.2019.102781

Cited by 29 publications

(22 citation statements)

References 20 publications

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“…There are a lot of numerical simulation works on the dynamic responses of transmission lines under different dynamic loads such as ice-shedding and wind loads [23][24][25][26][27]. In these works, the conductors are simulated by cable or beam elements, which cannot reflect the real stress in the wires of the stranded conductors due to ignoring their structural details.…”

Section: Dynamic Characteristics Of Conductorsmentioning

confidence: 99%

“…However, the 3D model was not used in an integral model to reveal the responses when the whole span overhead line is subjected to external loads. There are some numerical and experimental works on tension variation in conductors during vibration, such as dynamic responses of transmission lines after ice-shedding [23][24][25], dynamic swing of transmission lines under steady and stochastic wind [26] and galloping of iced transmission lines [27]. However, in these researches the conductors are equivalent to uniform cables without considering the effects of the stranded details of the conductors on their stress, strength, fatigue and wear.…”

Section: Introductionmentioning

confidence: 99%

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Study on mechanical characteristics of conductors with three-dimensional finite-element models

et al. 2020

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Refined three-dimensional (3D) finite-element (FE) models of typical aluminium conductor steel reinforced (ACSR) and formed aluminium conductor steel reinforced (FACSR) with structural details to simulate their static and dynamic characteristics are proposed. Taking into account the elastoplastic behaviour of the aluminium wires, the tensile mechanical properties and coupling between tension and torsion of the two types of conductors under tensile loading are numerically investigated. Furthermore, dynamic responses of two transmission lines, in which the refined 3D segment models and equivalent beam models of the two types of conductors are used, after ice-shedding are numerically simulated and the dynamic characteristics of the conductors are analysed. Finally, based on the numerical simulation results, the fatigue lives of the aluminium wires are estimated and the wear between the wires is discussed. It is revealed that taking into account the structural details of the conductors in the strength design of transmission lines is necessary, and the mechanical characteristics of FACSR are better than those of the ACSR in both static and dynamic situations.

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Section: Dynamic Characteristics Of Conductorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on mechanical characteristics of conductors with three-dimensional finite-element models

et al. 2020

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“…Under the natural conditions, the construction cycle of the test foundation often lasts nearly one year, including the process of excavation, pouring, maintenance, backfilling, and refreezing and so on [1,5]. Therefore, the reduced-scale modeling test is selected in this work, which is refer to in [19] and [20].…”

Section: Reduced-scale Modeling Testmentioning

confidence: 99%

Uplift Bearing Capacity of Cone-Cylinder Foundation for Transmission Line in Frozen Soil Regions, Using Reduced-Scale Model Tests and Numerical Simulations

et al. 2020

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In order to analyze the uplift bearing capacity of cone-cylinder foundation for transmission line in frozen soil regions, a series of reduced-scale modeling tests and numerical simulations are carried out. First, three reduced-scale cone-cylinder foundations with the same sizes, that are five times smaller than the prototype, are made and then loaded under uplift load at −5 • C, −10 • C, and −15 • C, respectively. On this basis, the foundations of nine sizes are modeled and loaded by numerical simulation. The impact of three dimension factors, including the ratio of depth to bottom width (λ = h t /D t ), the top diameter of the cone-cylinder (d), and the bottom diameter of the cone-cylinder (D), on the uplift bearing capacity of foundations have been investigated. The results reveal that, for cone-cylinder foundation, the uplift bearing capacity is obviously affected by the freezing temperatures and the foundation sizes. The capacity is negatively correlated with the former. Whereas the order of correlation with the latter is as follows: λ, D, and d based on the comprehensive results of range and variance analysis, but none of them are the significant factors, according to the F-test. Furthermore, three failure mechanisms of frozen soil are distinguished and named T-mode, V-mode, and U-mode, respectively. Based on the above results, the bearing mechanism of cone-cylinder foundation in frozen soil is elaborated in detail.

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“…Based on the conservation of energy and the geometrical relationship between the span and the swing of an insulator, Wu et al [16] proposed a theoretical calculation method for the largest jump height of a transmission line; a comparison of the results with a finite element analysis revealed good agreement, and the theoretical method exhibited the advantages of both accuracy and convenience. Huang et al [17] proposed a method to study ice shedding using a scale test and verified the effectiveness of the proposed method by comparing the results with two full-scale tests. However, the paper mentioned above ignored the stiffness of ice, and assumed that the ice on the conductor fell off in a certain pattern that was unrealistic.…”

Section: Introductionmentioning

confidence: 99%

Collapse Analysis of a Transmission Tower-Line System Induced by Ice Shedding

Wang

Sun

et al. 2021

Front. Phys.

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Ice shedding causes transmission lines to vibrate violently, which induces a sharp increase in the longitudinal unbalanced tension of the lines, even resulting in the progressive collapse of transmission towers in serious cases, which is a common ice-based disaster for transmission tower-line systems. Based on the actual engineering characteristics of a 500 kV transmission line taken as the research object, a finite element model of a two-tower, three-line system is established by commercial ANSYS finite element software. In the modeling process, the uniform mode method is used to introduce the initial defects, and the collapse caused by ice shedding and its influencing parameters are systematically studied. The results show that the higher the ice-shedding height is, the greater the threat of ice shedding to the system; furthermore, the greater the span is, the shorter the insulator length and the greater the dynamic response of the line; the impact of ice shedding should be considered in the design of transmission towers.

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Study on jump height of transmission lines after ice-shedding by reduced-scale modeling test

Cited by 29 publications

References 20 publications

Study on mechanical characteristics of conductors with three-dimensional finite-element models

Study on mechanical characteristics of conductors with three-dimensional finite-element models

Uplift Bearing Capacity of Cone-Cylinder Foundation for Transmission Line in Frozen Soil Regions, Using Reduced-Scale Model Tests and Numerical Simulations

Collapse Analysis of a Transmission Tower-Line System Induced by Ice Shedding

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