Dynamical analysis of transmission line cables. Part 2—damping estimation

Barbieri, Nilson; Júnior, Oswaldo Honorato de Souza; Barbieri, Renato

doi:10.1016/s0888-3270(02)00218-2

Cited by 39 publications

(9 citation statements)

References 6 publications

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“…where is the wire tension at the point. When the tension exists, the vibration damping effect of the wire will be reduced and the bandwidth of vibration frequencies will increase, the wire is easier to start oscillation [8,9]. In this paper, the tension is the maximum tension of the wire at the lowest point.…”

Section: Parametermentioning

confidence: 98%

Overhead Transmission Lines Deicing under Different Incentive Displacement

Zhao

2014

Journal of Applied Mathematics

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Overhead transmission line icing is one of the main factors affecting safety and reliability of power grid. This paper proposed an excitation deicing method of iced wire and theoretically revealed the ice removal mechanism under displacement excitation conditions, by taking the LGJ-70/10 glaze icing wire as the 3D model and analyzing and studying its dynamic response under the effect of displacement excitation. The simulation results show that the stress of wire icing area is enlarged with the increase of excitation displacement and frequency. Through the comparison of the compression strength experimental results on a series of different iced wires in low temperature environment, the authors found out that the stress generated from the wire icing area is greater than the crushing strength of the ice within the scope of the calculation parameters, which proved the validity and the feasibility of the method, and finally the suitable excitation displacement is determined. Following studies show that, as far as possible, it is necessary to reduce the incentive displacement and also to select the appropriate constraint length in order to avoid the line jumping that may be caused by large span ice shedding.

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Section: Parametermentioning

confidence: 98%

Overhead Transmission Lines Deicing under Different Incentive Displacement

Zhao

2014

Journal of Applied Mathematics

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“…In previous numerical studies, damping was modeled either by nonlinear spring/damper elements parallel to the cable elements and ice elements as in [6,7,[16][17][18][19] or by Rayleigh damping as in [9,14,23]. Since the Rayleigh damping model can consider explicitly the system mass and stiffness, it is used in the present study to check the differences between dynamic responses with and without considering the induced-iceshedding effect.…”

Section: Time-varying Damping Matricesmentioning

confidence: 99%

The Time-Varying Characteristics of Overhead Electric Transmission Lines Considering the Induced-Ice-Shedding Effect

Rui

Lin

et al. 2015

Shock and Vibration

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More ice deposits accreted on conductors or ground wires may be shed off when an overhead electric transmission line is responding to shocks initiated by natural ice shedding. Ice shedding causes the global mass, stiffness, and damping of the tower-line system to vary with time, and the successive shedding effect beyond a trigger event has not been taken into account in previous studies due to the lack of an adequate ice detachment model. In this paper, the ice shedding effect induced by initial shocks was considered in finite element (FE) analysis. An ice detachment criterion, in the way of user-defined element rupture subroutine, was implemented into the main commercial nonlinear FE program ADINA, making it possible to consider the induced-ice-shedding effect numerically. The incremental FE form of the system’s governing equations of motion is presented where the variations in the mass and stiffness matrices of the system are taken into consideration. Taking a transmission line section following natural ice shedding as a case study, the results indicate that neglecting successive ice shedding underestimates the adverse influence of natural ice shedding. The proposed method can help to improve the design and evaluation of transmission lines in cold regions and to ensure their mechanical security.

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“…The damping of a conductor line can be depicted by Raleigh damping [10] , which can be expressed as follows:…”

Section: The Updated Lagrangian Formulationmentioning

confidence: 99%

Nonlinear numerical simulation method for galloping of iced conductor

Liu

Yan

Zhang³

et al. 2009

Appl. Math. Mech.-Engl. Ed.

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Based on the principle of virtual work, an updated Lagrangian finite element formulation for the geometrical large deformation analysis of galloping of the iced conductor in an overhead transmission line is developed. In numerical simulation, a threenode isoparametric cable element with three translational and one torsional degrees-offreedom at each node is used to discretize the transmission line. The nonlinear dynamic system equation is solved with the Newmark time integration method and the NewtonRaphson nonlinear iteration. Numerical examples demonstrate the efficiency of the presented method and the developed finite element program. A new possible galloping mode, which may reflect the saturation phenomenon of a nonlinear dynamic system, is discovered under the condition that the lowest order of vertical natural frequency of the transmission line is approximately two times of the horizontal one.

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Dynamical analysis of transmission line cables. Part 2—damping estimation

Cited by 39 publications

References 6 publications

Overhead Transmission Lines Deicing under Different Incentive Displacement

Overhead Transmission Lines Deicing under Different Incentive Displacement

The Time-Varying Characteristics of Overhead Electric Transmission Lines Considering the Induced-Ice-Shedding Effect

Nonlinear numerical simulation method for galloping of iced conductor

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