Experiment Study on Dynamic Effects of Tower‐Line Systems Induced by Ice Shedding

Xie, Xianzhong; Wu, Yuanting; Liang, Kaiyuan; Liu, Sai; Jian, Peng

doi:10.1155/2020/6241789

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…The research on ice shedding mainly focuses on the displacement at key positions of conductors and the dynamic tension, mainly including physical test methods, theoretical analysis methods, and numerical simulation methods. Among them, the physical test method includes full-scale tests and reduced-size tests [1][2][3][4]. The former directly uses real transmission lines to carry out experiments, and the results are closer to the ice-shedding reaction under real conditions, but the cost is high and the test is difficult [1][2].…”

Section: Introductionmentioning

confidence: 99%

“…The former directly uses real transmission lines to carry out experiments, and the results are closer to the ice-shedding reaction under real conditions, but the cost is high and the test is difficult [1][2]. The reduced-size test, using a small size or scaled reduction model, can carry out a large number of tests [3][4]. Because the ice-shedding process is a strong nonlinear movement, the reduced-size test is based on linear theory, so there are certain limitations in the test results.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Ice-shedding induced flashover accident on a transmission line in mountainous terrain

Ji,

Liu,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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Transmission lines are essential infrastructure for modern society. Large amplitude vibration of conductors due to ice shedding may cause electrical faults, resulting from insufficient clearance among different phases and phase conductors and ground wires. A flashover fault on a 500kV transmission line located in a mountainous area, which is caused by ice shedding, is analysed in this paper. The approximate reason and history of the flashover accident were restored by the nonlinear finite element method with the help of ANSYS software. The key physical parameters such as conductor ice thickness and amount of ice shedding at the moment of the accident were analysed. The study in this paper helps to gain a deeper understanding of the ice-shedding–induced disasters of transmission lines and provides important reference for the design of transmission structures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Ice-shedding induced flashover accident on a transmission line in mountainous terrain

Ji,

Liu,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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“…Wu et al [18] established a theoretical model of deicing jump height of ice-covered transmission lines, but only considered the energy relationship under static state, and its extensive engineering applicability remains to be determined. Xie et al [26] established a quantitative relationship between jump height and sag based on the parabola, but the formula contained tension in different states and did not consider the influence of cable dynamic characteristics. Lou et al [27] obtain aerodynamic force coefficients of the iced conductor with crescent sections by wind tunnel experiment.…”

Section: Introductionmentioning

confidence: 99%

Study on the Maximum Ice-Shedding Height of Conductor Based on Energy Method

Wang,

Yan,

Zhong

et al. 2023

IEEE Access

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Ice shedding of transmission lines may lead to interphase flashover and thereby endanger power transmission. The ice shedding of transmission lines is essentially an energy conversion process. Based on the vibration theory and energy method of cable structures, the iced load of a transmission line is regarded as the working load under the condition of a bare conductor. The theoretical analysis model of ice shedding for a single-span transmission line was established with a vertical symmetrical vibration mode configuration. Then the analytical solution of maximum jump height is given. The proposed formula makes clear the quantitative relationship among maximum jump height and the verticality of the conductor, the icing mass ratios, and the dimensionless frequency. The vibration of a single-span transmission line after ice shedding is investigated by the finite element method to validate the proposed formula. The results show that the maximum jump height calculated by the formula has a good agreement with the finite element analysis, which fully meets the engineering accuracy requirements. The total jump height calculated by the current method is only 1.6% lower than that from finite element method. The contribution of high-order vertical mode is small with a small sag. By considering the contribution of high-order vertical modes, the calculation formula was further modified to get more accurate results. Since the vertical modes are mainly determined by dimensionless parameters, a simplified calculation empirical formula for maximum jump height optimization was obtained by fitting based on parametric analysis results. The presented proposed formula can provide theoretical guidance and be employed to predict the maximum jump height after ice shedding for transmission line design.

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“…Social production and development cannot be separated from the support of power engineering construction. Power system is a large and complex lifeline system engineering, in which the transmission and transmission links are an indispensable part [1][2][3]. If there is a problem in the transmission link, it will lead to the normal operation of the entire power supply system, which will have a serious impact on the normal production and living order of the people.…”

Section: Introductionmentioning

confidence: 99%

Application of BPNN Optimized by Fireworks Algorithm on Structural Bearing Capacity Analysis of Transmission Tower under Icing Conditions

Guo,

Guo

2023

Advances in Civil Engineering

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With the increasing power demand in city development, the construction and application of transmission towers need to meet higher requirements. Icing is an extreme meteorological condition in the world, and icing disasters cause various accidents such as tower collapse and line disconnection of large-area lines every year. Therefore, it is of great significance to study the ultimate bearing capacity of transmission towers under icing conditions. The structural bearing capacity under icing is greatly affected by meteorological conditions and environmental factors, which has strong randomness and complexity, and brings a series of urgent problems to the structural stability of transmission towers. In the paper, the ultimate bearing capacity analysis and failure path research are conducted on the 500 kV linear cathead tower structure, and a structural bearing capacity prediction model based on the fireworks algorithm (FWA) is established. In order to accurately predict the structural bearing capacity, reduce the adverse effects of line icing, and ensure the structural stability of the transmission tower, the FWA is introduced into the neural network model. The self-adjusting mechanism of the local search ability and global search ability of the FWA is used to optimize the optimization process of weights and thresholds in the neural network, and a structural bearing capacity prediction model based on the FWA improved backpropagation neural network (BPNN) is proposed. Through the analysis and calculation of the measured data of the transmission tower in a certain area, and the comparative study with the traditional BPNN and the BPNN optimized by other common algorithms, the analysis and calculation results of the FWA-BPNN model used in this paper are closer to the actual value, the multiple indicators are more superior, and the model is more stable, which can realize the rapid and accurate analysis of the axial stress of tower members and maximum displacement between member nodes of the transmission tower under the icing condition.

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Experiment Study on Dynamic Effects of Tower‐Line Systems Induced by Ice Shedding

Cited by 7 publications

References 26 publications

Analysis of Ice-shedding induced flashover accident on a transmission line in mountainous terrain

Analysis of Ice-shedding induced flashover accident on a transmission line in mountainous terrain

Study on the Maximum Ice-Shedding Height of Conductor Based on Energy Method

Application of BPNN Optimized by Fireworks Algorithm on Structural Bearing Capacity Analysis of Transmission Tower under Icing Conditions

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