Research On Mechanism And Prevention Measure Of Galloping For Iced Transmission Lines

Serious impact on normal operation of power system at home and abroad of the natural disaster is the ice later produced a series of overhead transmission line fault.In recent years,China's overhead transmission lines because the ice and lead to failure or disaster often happen,the safety of the power system running stability is always a big threat,also will bring the development of the national economy great restriction and losses.Therefore,further study of overhead transmission lines ice dance move and dance prevention measures have important practical significance and engineering value.High voltage transmission structure is high load power transmission carrier,is an important project.Transmission line has many characteristics,such as large span,flexible strong,such as wind load,wire ice environment load sensitive,prone to vibration fatigue damage and extreme conditions of dynamic fracture damage.From the disaster situation analysis: the loading mechanism and the complexity of structure dynamic response characteristics of defects on the theoretical knowledge and the insufficiency,due to the limitation of design theory and the defects,make some unreasonable disaster prevention control measures of existing transmission lines,remains to be further fundamental research of the system.Meteorological features in North-East of China,the environmental loads such as wind,ice forms the load of the complexity of environmental load response lead to transmission line is very complicated.Therefore,combining with the study of the theory of the transmission lines at home and abroad and engineering background,a basic wave disaster prevention theory research has become an important topic to the current address.For the research of transmission line galloping,this paper studied the following content:based on the conductor is vertical,horizontal and torsional coupled vibration of three directions under the condition of three degrees of freedom mechanics analysis model of ice wire galloping mathematical model is deduced,and the aerodynamic characteristics of ice wire galloping validated numerical calculation,to calculate the single reply iced conductor under different wind Angle of attack of lift coefficient and drag coefficient and torque coefficient and get ice traverse the aerodynamic parameters on the influence law of galloping;On this basis,the simulation model of wire,the building principle of wind field is studied,and the three-dimensional wind field model is established to study the coupling method and meshing and solving method,to complete the grid division and structure of load,the finite volume method for solving,get the wire under the action of wind field wave deformation condition,compare the field observation data is verified.Finally,equipped with effective prevention dance dance techniques of device and interval rods of the solution are analyzed,and summarizes the value of interval great dance prevention effect.