Mechanical Performance Optimization And Electrothermal Field Analysis Of GW17 UHV Disconnector

The high-voltage disconnector switch is an important high-voltage electrical equipment in the power grid system,and it is the key to ensure the normal operation of the power transmission system.In order to optimize the supply of power resources and ensure the normal operation of the power system,this paper studies and analyzes the GW17 type high-voltage disconnector,aiming to improve the stability of the system operation,dynamic analysis and optimization design of the mechanical characteristics of the disconnector main switch system,and the electric field and temperature field of its main conductive system are analyzed at the same time.The main research contents are as follows:Firstly,the structure and working principle of high-voltage disconnector are introduced,and the three-dimensional model of GW17 high-voltage disconnector is established according to the basic parameters.According to the motion diagram,the main knife switch mechanism is divided into two parts: transmission system and folding arm system.The mathematical models are established and the motion analysis is carried out respectively.Secondly,through the experimental study of the disconnector,it is found that the reason for the stagnation of the disconnector in the operation process lies in the motor steering hysteresis effect.The obtained test data are segmented and combined as the input driving function of the simulation,so as to achieve the effect of simulating the actual operation.The virtual prototype is established in ADAMS to analyze the dynamics of the key components and balance spring system.Thirdly,taking the optimal opening state and minimum external input as the optimization objectives,the optimization design model of disconnector is established,and the particle swarm optimization algorithm is used to optimize the main knife switch system.After optimization,the space tie rod of the transmission system is reduced by14 mm,and the maximum force of the space tie rod ball pair is reduced by 35.7%,which realizes the lightweight of the transmission system and reduces the failure rate of the system;The maximum lifting angle of the lower conductive rod is increased by 5.9%,which improves the motion state when opening and improves the stability of operation;The maximum driving torque after optimization is 50.6% less than that before optimization,and the external input torque is reduced.Finally,the electric field simulation analysis is carried out in ANSYS Electronics.It is obtained that the maximum field strength of the model is 2.58kv/mm,which is lower than the ionization field strength of air by 3.0kv/mm.It is verified that the electric field shielding of the grading ring is good and will not produce halo phenomenon;At the same time,the temperature field is analyzed in ANSYS Workbench,and it is obtained that the temperature rise at the soft connection part of the lower conductive rod is up to 48 ℃,which is lower than the allowable temperature rise value.Then,through the temperature rise test,it is verified that the high-voltage disconnector meets the design requirements.