Reliability Analysis Of Transmission Line Structural System Subjected To Wind Load

Power system is an important life line engineering of our country,and is the foundation to solve the energy problem increasingly prominent in our country.Being an integral part of the power system,transmission line is crucial to guarantee the power system's continuous and stable operation.Transmission line engineering requires huge investment,and has a far-reaching influence.The breakdown of the transmission line will bring about serious influence on and great harm to people's life and work and the stable development of national economy,so the safety and reliability of the transmission line are important for the stable development of our country.Reasonable and reliable line engineering design can ensure the safe and stable operation of the transmission line,and structural design is the basis of transmission line engineering design.The key point of structural design lies in the reliability analysis of structure,thus it is significant to carry out reliability analysis on transmission line structural system.In this paper,research is conducted on the reliability of typical tower structural system,tower line structural system and transmission line structural system in the transmission line under the wind load.Firstly,modeling analysis is conducted on the typical tower structure and tower line structural system with ANSYS,according to the basic line information,which includes geographic and meteorological information,to provide basis for the study of the structural reliability.Secondly,equivalent description method is introduced,and the moment method is adopted to calculate and analyze the reliability of typical tower structural system in the transmission line under wind load,wherein the moment method is based on the Rosenblatt,converted,simplified,and based on the cubic normal distribution.Then,equivalent value event is introduced,and moment method is adopted to calculate and analyze the reliability of the tower line structural system corresponding to the typical tower in the transmission line under the wind load.Finally,analytic hierarchy process and variable weight principle areintroduced,three-level subsystem recurrence reliability analysis model and calculation method of the transmission line structural system are established,influence of the channel environment of the tower section on the transmission line structural system is analyzed based on the reliability of typical tower line system obtained by analysis,and the reliability of the structural system of the whole transmission line is reasoned out.Through comparative analysis,it is obvious that the reliability analysis model and calculation method proposed in this paper much more conform to the engineering practice and can meet the actual demand of engineering.