A method to calculate jump height of iced transmission lines after ice-shedding

Wu, Chuan; Yan, Bo; Zhang, Liang; Zhang, Bo; Li, Qing

doi:10.1016/j.coldregions.2016.02.001

Cited by 42 publications

(14 citation statements)

References 10 publications

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“…And the quantitative analysis was carried out (see [13]). According to energy conservation, stress-sag relation, geometrical relation of spans, and equilibrium of suspension insulators of multispan transmission lines after ice shedding, Wu et al proposed the theoretical method for calculating the maximum jump of transmission lines (see [14]). Xie et al studied the dynamic characteristics of two-span suspended transmission lines and introduced the frequency avoidance phenomenon (see [15]).…”

Section: Introductionmentioning

confidence: 99%

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

Xie

Liang

et al. 2020

Advances in Civil Engineering

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Taking the 220 kV transmission line as the prototype, a test model of the double-span tower-line system with a scale ratio of 1 : 20 was proposed on the basis of dynamic similarity theory. 14 different working conditions including zippered, simultaneous, entire, and local ice-shedding were controlled and realized by use of the program-controlled mode. The displacement transient responses of transmission line under these ice-shedding conditions were analyzed in detail. The results show that the variation laws of the ice-shedding dynamic-load coefficient and the jump height with the velocity, quantity, and position of the ice-shedding are obtained, which can provide references for the design of the transmission tower-line system.

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Section: Introductionmentioning

confidence: 99%

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

Xie

Liang

et al. 2020

Advances in Civil Engineering

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“…Changes in the static state of suspended cables are due to temperature variations [17,18], ice loads [19,20], moving mass [21][22][23], vibrations [24][25][26][27], or intentional power overloads that raise cable temperatures [28]. Although most of the works start from an initial static curved state [16][17][18][19][20][21][22][23][24][25][26][27][28], Yang [29] considered the initial state without mechanical tension (stress) and with the cable in a horizontal position. Luongo and Zulli [30] described the first step in solving the static response equation in cables under vertical loads.…”

Section: Introductionmentioning

confidence: 99%

A Didactic Procedure to Solve the Equation of Steady-Static Response in Suspended Cables

et al. 2020

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Students in the electrical branch of the short-cycle tertiary education program acquire developmental and design skills for low voltage transmission power lines. Aerial power line design requires mathematical tools not covered well enough in the curricula. Designing suspension cables requires the use of a Taylor series and integral calculation to obtain the parabola’s arc length. Moreover, it requires iterative procedures, such as the Newton–Raphson method, to solve the third-order equation of the steady-static response. The aim of this work is to solve the steady-static response equation for suspended cables using simple calculation tools. For this purpose, the influence of the horizontal component of the cable tension on its curvature was decoupled from the cable’s self-weight, which was responsible for the tension’s vertical component. To this end, we analyzed the laying and operation of the suspended cables by defining three phases (i.e., stressing, lifting, and operation). The phenomena that occurred in each phase were analyzed, as was their manifestation in the cable model. Herein, we developed and validated the solution of the steady-static response equation in suspended cables using simple equations supported with intuitive graphics. The best results of the proposed calculation procedure were obtained in conditions of large temperature variations.

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“…temperature rise) cause a vertical jump of the power lines and may lead to flashover if the phase-to-phase or phase-to-tower distance is smaller than the tolerable insulation distance. Therefore, it is necessary to determine the maximum jump height of an overhead power line after ice-shedding and to provide a reference for the design of the overhead power lines [1]. Ice-shedding can also cause dangerous vibrations in power lines, which can result in mechanical damage of the power line and power line pylons.…”

Section: Introductionmentioning

confidence: 99%

“…In [4,5] the dynamic behavior of bundle conductors and five-span line section after ice-shedding is numerically simulated. In [1], a new theoretical method to calculate the jump height of the overhead power line after ice-shedding is presented.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Ice-Shedding from ACSR Power Line

Hrabovský

Gogola

Muŕın

et al. 2017

Strojnícky Casopis – Journal of Mechanical Engineering

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Abstract:In this contribution, the analysis of ice-shedding from Aluminium Conductor Steel Reinforced (ACSR) power lines is presented. The impact of the icing position on the overhead power lines, the resulting jump height, and impact on attachment tension points after ice-shedding is examined. In the numerical simulations the effective material properties of the ACSR conductor is calculated using the homogenisation method. Numerical analysis of one power line and double-bundle power lines with icing over the whole range or only on certain sections of single and double-bundle power lines are performed. KEYWORDS:ACSR power line, ice-shedding, finite element method, transient analysis IntroductionIn cold regions, atmospheric icing is one of the major external loads threatening the reliability and mechanical integrity of overhead power lines. Ice-shedding form an iced overhead power line (eq. temperature rise) cause a vertical jump of the power lines and may lead to flashover if the phase-to-phase or phase-to-tower distance is smaller than the tolerable insulation distance. Therefore, it is necessary to determine the maximum jump height of an overhead power line after ice-shedding and to provide a reference for the design of the overhead power lines [1]. Ice-shedding can also cause dangerous vibrations in power lines, which can result in mechanical damage of the power line and power line pylons. Therefore, the transient analysis of ice-shedding is necessary.Ice-shedding has been investigated with experimental, numerical and theoretical methods by many authors. Very approximate practical models have been suggested as early as the 1940s [2]. With the improvement of computational mechanics, numerical simulation methods (over all the finite element method -FEM) were used to study ice-shedding from the power lines eq. in [3] the simulation of the dynamic responses of transmission lines with different parameters after ice-shedding by means of FEM. In [4,5] the dynamic behavior of bundle conductors and five-span line section after ice-shedding is numerically simulated. In [1], a new theoretical method to calculate the jump height of the overhead power line after ice-shedding is presented.In this paper, the results of the transient analyses of ice-shedding from the ACSR power lines are presented. The results are calculated using a commercial finite element software ANSYS. 2 Modelling of ACSR power lineAluminium Conductor Steel Reinforced (ACSR) cable are multi-wire conductors commonly used in overhead power lines. The outer strands of ACSR are made of aluminium due to its excellent conductivity, low weight and low cost. The center strands are made of steel for the strength required to support the weight without stretching the aluminium due to its ductility.

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A method to calculate jump height of iced transmission lines after ice-shedding

Cited by 42 publications

References 10 publications

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

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

A Didactic Procedure to Solve the Equation of Steady-Static Response in Suspended Cables

Modeling of Ice-Shedding from ACSR Power Line

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