Design And Research Of Overhead Transmission Line Renovation Project

Most of the power plants are built in or near the primary energy sources.At the same time,larger load centers are often located in large cities and industrial areas,that is,power plants and load centers are usually far apart.Therefore,power transmission system is needed to carry out power transmission.This paper mainly relies on the long party line transmission transmission line transformation project to carry out overhead transmission line design research.The main design stage of power engineering has feasibility study,preliminary design,construction drawing design and so on.In this paper,the main research contents for the prelininary design stage are as follows.In the first part,the design status of high-voltage transmission lines is discussed,and the design specifications and design status of high-voltage transmission lines at home and abroad are compared.Then,the calculation method for checking the distance between the two transmission lines is discussed.The conventional design calculation method and finite element calculation method are explained and compared,and the new calculation method is presented.The necessity of the method.In the second part,the electrical design technology of overhead transmission lines in the preliminary design and construction drawing stage is studied.Taking this project as an example,the impedance and natural power of transmission lines,electric field strength of overhead transmission lines,corona,radio interference and noise interference,insulation coordination,lightning protection and grounding are calculated,and the calculation is based on the above.The traverse type is selected according to the calculation results.In the third part,the technical mechanics of the planning and design of overhead transmission lines in the preliminary design and construction drawing stages is studied.Taking the steel-core heat-resistant aluminum alloy strand used in this project as an example,the basic nechanical parameters of conductors,conductor model,catenary nodel,oblique parabola model and oblique parabola model,flat parabola model are studied.The determination of sag in traverse construction is introduced and explained.The fourth part,with the increase of the voltage level of transmission lines,the weight of tension insulator strings also increases.It is necessary to consider the influence of tension insulator strings when checking the distance between incoming conductors.In this chapter,the method of checking the distance between incoming conductors considering the weight of insulators strings is studied.Firstly,the emptiness of tension insulator strings is studied.According to the above calculation method of insulator string space shape and the formula of space oblique parabolic conductor,the VBA module in AutoCAD is used to program to realize the automatic calculation of the minimum distance between the inlet gears.The calculation is carried out through an engineering example and the calculation is carried out through calculation and analysis.Verify that the developed program can meet the design requirements of normal high voltage transmission lines.Finally,the full text is summarized.