Finite Element Analysis And Experimental Verification Of XGU Suspension Clamp

Hanging wire clips of High voltage transmission fixed on the insulator string is to realize the support of high voltage line on transmission tower wire,and ensure the line insulation.Also,the wire weight,wind load and hanging ice load in some parts of the line are the work of Hanging wire clips,so,if they fracture,line open circuit,short circuit will be happen.And even worse resulting to disastrous consequences which break down the whole high voltage transmission.Based on the typical wire single cable structure and differential equations of overhead transmission line,analyzing the stress of the transmission line conductor and wire line,especially,making a detailed load analysis to a high voltage transmission in different working conditions To type of malleable iron casting XGU suspension clamp,creating the finite element simulation mode to researching the distribution of stress on the clamp under different loading on,figuring out the most dangerous section about carrying,And the influence of different size and depth hole defects on the bearing capacity of the suspension clamp is analyzed.The simulation results show that the non-stress concentration defect has little effect on the strength of the suspension clamp structure,and the stress concentration area defect has a great influence on the strength of the suspension clamp,so the depth of defects in the center of the clamps shall not exceed 1 mm and the diameter shall not exceed 1 mm.Designing and fabricating the actual hanging clamp to simulate the working strength,and the test was carried out on the complete clamp and the clip with the artificial defect.The strength test results showed that the fracture position of the malleable cast iron clip was determined by the simulation The deformation and stress distribution of the clip were in good agreement with the finite element calculation(correlation 99.9%).The fracture of the strength test is analyzed,which indicates that the fracture is macroscopic brittle fracture.The starting point of the crack is the maximum point of the calculation,and the fracture is the transgranular fracture.The micro-mechanism part of the fracture is large and shallow.The results show that under the conventional ray detection process of the sensitivity of2.8% and the film quality grades to class AB can meet the detection of wire clips.The finite element simulation model and the load calculation method proposed in this paper can be used to guide the actual engineering design,which lays the foundationfor the formulation of the nondestructive testing acceptance standard.