Jump height of an iced transmission conductor considering joint action of ice-shedding and wind

Lou, Wenjuan; Zhang, Yue-long; Xu, Hengyu; Huang, Mingfeng

doi:10.1016/j.coldregions.2022.103576

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…The training loss for different pooling kernels is shown in Figure 6. Figure 6 shows the experimental results, where the training loss curve with combinations of (5,9,13) decreases the fastest and the segmentation effect is the best. This combination takes into account large, medium, and small scales, thus obtaining the most comprehensive local feature information.…”

Section: Feature Pyramid Pooling Experimentsmentioning

confidence: 99%

“…Ice-covered transmission lines in winter are a common hazard. After the transmission lines freeze, the significant increase in the weight of the cables can exceed their load-bearing capacity, causing cable deformation, and potentially leading to the collapse of the towers at both ends of the transmission lines [3][4][5]. Severe ice-covered transmission lines affect the normal operation of the transmission system and bring great inconvenience to daily life.…”

Section: Introductionmentioning

confidence: 99%

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GMSA-Net: A Transmission Line Ice Thickness Identification Network Based on Global Micro Strip Awareness

Zhang,

Dou,

Jiao

et al. 2024

Sensors

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Ice-covered transmission lines seriously affect the normal operation of the power transmission system. Resonance deicing based on different ice thicknesses is an effective method to solve the issue of ice-covered transmission lines. In order to obtain accurate ice thickness of transmission lines, this paper designs an ice thickness of transmission line recognition model based on Global Micro Strip Awareness Net (GMSA-Net) and proposes a Mixed Strip Convolution Module (MSCM) and a global micro awareness module (GMAM). The MSCM adapts to the shape of ice-covered transmission lines by using strip convolutions with different receptive fields, improving the encoder’s ability to extract ice-covered features; the GMAM perceives through both global and micro parts, mining the connections between semantic information. Finally, the ice thickness of the generated segmented image is calculated using the method of regional pixel statistics. Experiments are conducted on the dataset of ice-covered transmission lines. The mean Intersection over Union (mIoU) of image segmentation reaches 96.4%, the balanced F-Score (F1-Score) is 98.1%, and the identification error of ice thickness is within 3.8%. Experimental results prove that this method can accurately identify the ice thickness of transmission lines, providing a control basis for the application of resonant deicing engineering.

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Section: Feature Pyramid Pooling Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

GMSA-Net: A Transmission Line Ice Thickness Identification Network Based on Global Micro Strip Awareness

Zhang,

Dou,

Jiao

et al. 2024

Sensors

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“…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. Based on the FEM results, they proposed an empirical formula for estimating the maximum height jump considering the combined effect of ice and wind.…”

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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“…By means of the FE method, the dynamic responses of multispan transmission lines after ice-shedding were simulated by some authors [11][12][13][14][15] under various structural and iceshedding parameters, and their effects on the jump height and tension in the conductor were investigated. Lou et al [16] investigated the coupling effects of wind action and ice shedding on the jump height based on the aerodynamic force coefficients of the iced conductor. Meng et.…”

Section: Introductionmentioning

confidence: 99%

“…Lou et al. [16] investigated the coupling effects of wind action and ice shedding on the jump height based on the aerodynamic force coefficients of the iced conductor. Meng et.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on dynamic response characteristics of isolated‐span transmission lines after ice‐shedding

et al. 2022

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The dynamic response characteristics, including maximum jump height and unbalanced tension, of isolated‐span transmission lines after ice‐shedding are investigated by means of experiments. A reduced‐scale modelling method for ice‐shedding from conductor lines is presented and verified with numerical simulations and full‐scale test results in the literature. A parameter study on dynamic responses of isolated‐span conductors under three ice‐shedding scenarios, including whole span ice‐shedding, partial ice‐shedding and unzipping ice‐shedding, is carried out by means of reduced‐scale modelling tests. The effects of these parameters on the maximum jump height at typical positions and unbalanced tension in the tension tower are obtained. It is observed that the partial ice‐shedding scenario may be the worst situation for electrical insulation clearance rather than the whole span ice‐shedding scenario. Moreover, the position of maximum jump height along the span of isolated‐span transmission lines after ice‐shedding could be at around 2/5 of span length, which is different from the conventional opinion that the position is at the midpoint. The results may provide a foundation for the defining of the insulation clearance for an isolated‐span transmission line and the structure design of tension tower arms in an iced zone.

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Jump height of an iced transmission conductor considering joint action of ice-shedding and wind

Cited by 15 publications

References 32 publications

GMSA-Net: A Transmission Line Ice Thickness Identification Network Based on Global Micro Strip Awareness

GMSA-Net: A Transmission Line Ice Thickness Identification Network Based on Global Micro Strip Awareness

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

Experimental study on dynamic response characteristics of isolated‐span transmission lines after ice‐shedding

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