Study On De-icing Transmission Line By Explosive Blast Based On ABAQUS

Because of the serious disaster caused by the icing of power transmission lines,a method of deicing of power transmission lines by blasting with explosives was proposed.In order to ensure the safety and reliability of this method in practical application,there are great significance to study the optimization of blasting parameters and the dynamic response of de-icing under blasting.Based on ABAQUS finite element software,the deicing effect under the action of blasting are simulated.In simulation,the transmission line are described by an elastic-plastic model,the ice are simulated with porous elastic model,The linear explosive are simulated by JWL state equation.This paper Using ABAQUS studied the optimum setting parameters for different thickness ice.The simulation results show that the blasting parameters of 1.55g/cm~3explosive density and 20mm interval can meet the requirements of de-icing for the common ice line(ice covering thickness 15-30mm).When the icing thickness increases,the ideal de-icing effect can be obtained by increasing the charge amount of the explosive,but the interval should be increased appropriately to ensure the blasting will not damage the wire.In this paper,the transmission line equation under gravity are studied.and the program of transmission line shape-finding are written by MATLAB numerical solution software.The full size transmission line was accurately modeled by using the hybrid element T3D2H and beam element B31,and then the field variable quantum program USDFLD was developed based on ABAQUS,this program can realized the simulation of ice-induced shedding.The simulation results show that the static shape-finding method based on the suspension line equation is an accurate and efficient modeling method.Using subroutine to determine the simulation method can effectively simulate the ice coating induced detachment.On an outdoor single-span line,we carried out a real blasting de-icing experiment,and studied the amount of de-icing under blasting.Then the numerical simulation method was used to simulate the experiment,and analyzed the amount of de-icing under blasting.The results show that:deicing only occurred in the explosion zone of transmission line under blasting load.So the deicing amount can be controlled accurately by the blasting deicing method.In order to reduce the jump height of transmission line,it is better to blast at both ends of the single span line.Based on the project background of 220kV transmission line in Pingshun County,Shanxi Province,This paper studied the dynamic response of 200m single span transmission line without height difference by numerical simulation.The simulation results show that:for the single-span line.When blasting deicing,the maximum jumping height of the line are located in the blasting area.When the de-icing position are located at position 0.3 of the line,the jumping height of the line reaches the maximum.In addition,when the de-icing area are located at the end of the line and the deicing rate are more than 10%,the dynamic maximum tension at the hanging point of the line exceeds the static tension.Considering the effect of deicing to the tower line coupling system.This paper carried out the blasting de-icing simulation for a single span tower line system,and the results show that the ice shedding can cause the insulator string and the strain tower to be lateral displacement.When the de-icing area are located in the middle of the line,the displacement of the tension tower and the insulator string are largest,and the jump height of the transmission line are also higher.For the single span tower-line system in this paper,when the ice shedding rate are less than 20%,the displacement and the tension of the whole tower line system are within the safe range.