Study On Anti-Earthquake Ability Of 500kV Transmission Tower-line System

With the development of economy, more and more demand for electricity is needed in our country. Transmission line engineering has become a large-scale lifeline project.In order to improve the transmission efficiency of the transmission line, 500 kv transmission line has become the main transmission lines in our country since the early 80 s when the first 500 kV high-voltage transmission line was build. According to the regulation of current Code for design of seismic of electrical installations,the concrete tower that is located in the seismic intensity of 7 degrees or above, the large crossing steel tower that is located in the seismic intensity of 8 degrees or above and All kinds of tower is located in the seismic intensity of 9 degrees or above all need to be checked. Recent academic studies show that the earthquake characteristics of high voltage transmission tower-line coupling system are different from the single tower’s earthquake characteristics. So it is necessary to study the earthquake characteristics of high voltage transmission tower-line coupling system.In this thesis, the 500 kV transmission line is taken as the research object. First of all, the finite element models, including a strain tower, a tangent tower and a transmission tower-line coupling system are created in ABAQUS which is a finite element analysis software. Then, do the modal analysis of the two single towers and the transmission tower-line coupling system, obtain the natural frequency and the mode of vibration.Response spectrum analysis is carried out for the two single towers based on the theory of response spectrum. The maximum stress, maximum displacement and maximum bearing reaction force of the two single towers are obtained in the process of the response spectrum analysis. And the earthquake characteristics of the two single towers are obtained through the analysis of response spectrum.This article chooses the three direction seismic waves collected by Shifang stations from Wenchuan earthquake at the same time, and introduces the minimum square velocity method which can correct the seismic wave baseline, and use this kind of method to correct the three direction seismic waves. Do the single-base tower’s time-history analysis of a strain tower and a tangent tower of 500 kV, and obtained the seismic response of the train tower and tangent tower at any moment. Analyze the stress of transmission line in the process of the earthquake.