Study on Broken Wire Impact and Safety Degree Evaluation

摘要

Considering transmission tower-line system coupling vibration, construct a three dimensional finite element nonlinear analysis model for 500KV Shanghai to Xuzhou transmission line project. Execute Dynamic response analysis of transmission tower-line system under broken wire impact with SAP2000. The results show that : broken wire influence on the reaction of transmission tower-line system displacement and internal force can not be ignored ;influence on the reaction of transmission tower-line system displacement and internal force caused by ground wire broken is less while that of conductor is significant, peak value of a stem internal force can be as much as 2 times initial axial force ; the more wires are broken, the vibration response of transmission tower-line system is greater, the safety degree is lower;when it comes to internal force, there is significant difference between consider broken wire load as impact load and as static load, dynamic effects cannot be ignored.