Modeling The Dynamic Response Of Ice-shedding On Transmission Line And Its Application In Induced-ice-shedding

Icing on transmission lines is one of the most common disasters.The excessive vibration of conductor while deicing can induce the short circuit,conductor broken,tower collapse and other accidents.At present,the most researches are modeling and simulating the dynamic response of deicing of transmission lines under simple scenarios(such as deicing in a specified location,deicing in a specified quantity,deicing in a specified sequence)by using the finite element software.The most common scenario in practice is that the icing in other locations was shed in the process of conductor’s vibration induced by the initial deicing.It has the disadvantage of complex operations in process of modeling by using the finite element software to simulate the dynamic response of deicing under the complex scenarios.Therefore,the deicing dynamic models based on the two node isoparametric truss element of isolated span and continuous spans transmission lines were established in this paper.This can be used to study the deicing dynamic response under the complex scenario of induced-ice-shedding.Firstly,the transmission line model of isolated span was established based on the two node isoparametric truss element.The method of Newton-Raphson was used to solve the static equilibrium equation.The method of newmark integration combined with Newton-Raphson was adopted to solve the dynamic equation of deicing.The results showed the validity of adopted model and methods by comparing with the simulation results of finite element method software and the test results of the isolated span transmission line.Secondly,the transmission lines model of continuous spans were established based on the element model.The method of newmark integration combined with Newton-Raphson was adopted to solve the dynamic equation of deicing on continuous spans.The model includes the model of insulator string,the model of the hinged connection between conductor and insulator and the method for determining the initial position of continuous spans transmission line.The results showed the validity of adopted model and methods by comparing with the simulation results of finite element method software and the test results of the continuous span transmission line.Thirdly,based on the model of isolated span and continuous span,the effect of induced-ice-shedding under scenarios of different critical acceleration,different icing thickness,different initial deicing quantity and different initial deicing locations were simulated.And a series of regular conclusions were drawn.