Study On Influences Of Meteorological Factors On The Ground Electric Field Strength Of Transmission Lines Based On Matlab

With the continuous development of social economy,increasing the social demand for electricity.Because of unbalanced distribution of natural resources and unreasonable distribution of power and energy consumption centers,it is necessary to develop EHV/UHV transmission project in order to realize long-distance and low energy transmission of electric energy.Although the increase of line voltage level can reduce the line loss,but at the same time,it also aggravates the electromagnetic environment pollution around the circuit.Considering the strong electromagnetic field may affect the health of human body,so as to eliminate unnecessary concerns,it is necessary to simulate the ground electric field.However,most researchers do not consider the influence of meteorological factors on the field intensity,but according to the measured data,meteorological factors will affect the ground strength of transmission lines.Therefore,in order to evaluate the electromagnetic environment around the transmission line accurately,it is necessary to construct a model for estimating the ground strength of transmission lines considering meteorological factors.On the basis of referring to relevant literatures,the advantages and disadvantages of the calculation methods of electric field strength are compared and analyzed,and the simulation charge method is adopted to estimate the electric field intensity of transmission lines after considering the accuracy and simplicity of the calculation method.Then,by studying the basic process of corona discharge,the physical mechanism and the common effects,the corona discharge of wire has been fully understood.After clearing the mechanism of meteorological factors,using the wire state equation,charge simulation method,Peek formula to study on the electric field distribution with different meteorological conditions considering the discharge corona.Finally,because of the strong ground electric field value of EHV/UHV transmission lines,the effect of optimizing the line parameters,adding shielding wire,planting trees,smearing surface coating and other related mitigation measures are studied.In order to provide a reference for the relevant staff to optimize the design of the line,and to help reduce the public's excessive panic on the electromagnetic environment pollution caused by ultra/UHV transmission lines.Through the research of this paper,the following conclusions are obtained:1)The environmental humidity will increase the contribution rate of space charge to the ground field,but it will not affect the distribution trend of the ground field intensity;The maximum of ground field strength will decrease first and then increase with the increase of humidity;The influence degree of ambient humidity on ground field intensity is positively related to voltage level.2)The environmental temperature will increase the wire sag;The environmental temperature will increase the contribution rate of space charge to the ground field,but it will not affect the trend of the field strength distribution;The maximum field strength will increase as the temperature increases;With the upgrade of voltage level,effect of line corona discharge on the electric field increases,the influence degree of sag changes on the ground field strength gradually decreased.3)Optimizing the line parameters,adding shielding lines,planting trees,spreading surface coating and other mitigation measures can reduce the ground electric field strength of transmission lines,and it is helpful to solve the electromagnetic environment problems of EHV/UHV transmission lines.