Dynamic response of tension plate for UHVDC transmission lines under ice shedding loads

Progressive ice shedding (PIS) along transmission lines is a common type of ice shedding during thermal de-icing that requires investigation to ensure the security of transmission lines. In current research, PIS is commonly analyzed using a constant speed for ice detaching from the conductor, which is not accurate for PIS simulation. Therefore, a mechanical model of PIS is established in this study to analyze PIS during thermal de-icing. First, an ice detachment model during thermal de-icing is built to determine the detachment times of the initial ice and remaining ice. Then, a two-node isoparametric truss element is employed to derive the static and dynamic equilibrium equations of an iced conductor to simulate the dynamic response of PIS. Relative to commercial software, these equations can easily accommodate the changing mass of ice with the flow of melted water. The dynamic equilibrium equations are then solved using the ice detachment model to obtain the dynamic response of PIS. Finally, small-scale and full-scale experimental results are employed to verify the proposed method. The simulation results show that the results of the proposed method are more consistent with the experimental results than are the results of existing methods that assume a constant propagation speed. The proposed method can be further applied to optimize transmission line designs and evaluate the application of thermal de-icing devices.

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Prediction models for dynamic response parameters of transmission lines after ice-shedding based on machine learning method

Electric Power Systems Research ◽

10.1016/j.epsr.2021.107580 ◽

2022 ◽

Vol 202 ◽

pp. 107580

Author(s):

Nan Wen ◽

Bo Yan ◽

Zheyue Mou ◽

Guizao Huang ◽

Hanxu Yang ◽

...

Keyword(s):

Machine Learning ◽

Dynamic Response ◽

Transmission Lines ◽

Prediction Models ◽

Machine Learning Method ◽

Learning Method ◽

Ice Shedding

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Dynamic Response of Iced Overhead Electric Transmission Lines Following Cable Rupture Shock and Induced Ice Shedding

IEEE Transactions on Power Delivery ◽

10.1109/tpwrd.2016.2520082 ◽

2016 ◽

Vol 31 (5) ◽

pp. 2215-2222 ◽

Cited By ~ 8

Author(s):

Kunpeng Ji ◽

Xiaoming Rui ◽

Lin Li ◽

Fengli Yang ◽

Ghyslaine McClure

Keyword(s):

Dynamic Response ◽

Transmission Lines ◽

Electric Transmission ◽

Electric Transmission Lines ◽

Ice Shedding

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

Frontiers in Physics ◽

10.3389/fphy.2021.712161 ◽

2021 ◽

Vol 9 ◽

Author(s):

Jiaxiang Li ◽

Biao Wang ◽

Jian Sun ◽

Shuhong Wang ◽

Xiaohong Zhang ◽

...

Keyword(s):

Finite Element ◽

Transmission Lines ◽

Progressive Collapse ◽

Element Model ◽

Transmission Tower ◽

Line System ◽

Finite Element Software ◽

Transmission Towers ◽

Ice Shedding ◽

The Impact

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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