Abstract
Wet snow shedding from overhead power transmission cables due to periodically repeated impacts was simulated using the finite element software ADINA. It was simulated by point loads whose mass depended on the snow load on the cable. The adhesion between snow and cable was modeled by vertical springs whose stiffness was determined so that the spring force simulates tensile adhesion. Failure criterion for snow detachment from the cable was defined based on the acceleration of the snow-covered cable. This model was applied on a real scale cable with span length of 470 m. Time history of displacement at the excitation point was the input to the model, where varying impacts lead to different accelerations of the cable. The results showed the effects of increasing impact loads on cable jump and, consequently, on the rate of shedding.
Highlights
The interest of numerical modeling of the effects of snow shedding phenomena is to assess the possible dynamic impacts on transmission line elements, and to check whether the amplitude of the induced motion is within design limits of clearances between the conductor and the ground or other conductors.The first attempts to estimate rebound heights of conductors due to sudden ice release were made decades ago (Morgan, and Swift, 1964, Kalman et al, 2007)
Matsuura et al performed the dynamic effects of sudden ice shedding by the finite element method using ADINA
A model is proposed to simulate snow shedding induced by a periodic load on a single-span overhead cable, where the mass of snow deposited and its adhesion to the cable are considered
Summary
The interest of numerical modeling of the effects of snow shedding phenomena is to assess the possible dynamic impacts on transmission line elements, and to check whether the amplitude of the induced motion is within design limits of clearances between the conductor and the ground or other conductors.The first attempts to estimate rebound heights of conductors due to sudden ice release were made decades ago (Morgan, and Swift, 1964, Kalman et al, 2007). The interest of numerical modeling of the effects of snow shedding phenomena is to assess the possible dynamic impacts on transmission line elements, and to check whether the amplitude of the induced motion is within design limits of clearances between the conductor and the ground or other conductors. Matsuura (Matsuura et al, 1995) carried out real scale observations and analyses of ice shedding, which are fully exposed to heavy atmospheric icing (6kg/m). They measured the meteorological conditions, weight of ice, and the tension of insulator strings. The numerical analysis of the ice shedding phenomena by the finite element method(using ADINA) could be useful for the design of transmission lines prone to severe atmospheric icing
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