Simulation of iceshedding on transmission lines considering iceshedding velocity effect
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Abstract:
Iceshedding on transmission lines results in longitudinal unbalanced forces on adjacent transmission towers,which significantly threaten the safety of transmission lines.The methodology of iceshedding simulation on transmission lines is developed by using the finite element method and validated by comparing the simulation results with those obtained from the modelscale experiments done by previous researchers.The responses of the towerline system induced by simultaneous iceshedding on the conductor and ground wire are analyzed.The developed methodology is then applied to study iceshedding considering unzipping effect,in which the influence of the velocity of iceshedding on the responses is investigated.Results from this study show that the longitudinal unbalanced forces induced by simultaneous iceshedding from the ground wire are greater than those from the conductor under similar condition.During the analysis of iceshedding considering unzipping effect,the slower the velocity of iceshedding is,the closer the responses are to those resulting from static unloading;and the faster the velocity of iceshedding is,the closer the responses are to those resulting from simultaneous iceshedding.
