The Research On Applying Technology Of The 500kV Compact Transmission Line

Overhead compact transmission lines has the characteristic of compact structure,less land and low cost,large transmission power,which is widely used in domestic power grid electricity.In this paper,the compact circuit adopts V-shaped insulator string,using the triangular arrangement.The distance between phases is chose according to the size of transmission capacity and the natural power,and is corrected by the altitude. The electric parameters are different in different wire alignment and spaces.The characteristics of compact transmission line are introduced by comparing with the conventional type lines. And the measured parameters between the power frequency and high frequency are also introduced.Take 1000-2000m compact line for example,list the calculation results of ground electromagnetic field and radio interference and noise.The analysis of the radio interference and noise level and attitude correction are made by using the prediction formula of transmission lines.The compact lines are used in engineering application.This paper introduces how to undertake engineering design.The triangle arrangement of wire array structure is applied to engineering.The design of vibration control of wire is made by choosing the different distances of different altitudes.According to the technical regulations for insulation design,which includes the selection of insulator,the installation of interval rods and minimum value of air gap.Finally,the analysis of characteristics of compact trasmission lines is made.The areas of distances are different in different residential areas.The ground distance of compact lines in non-residential area is smaller than the conventional type line.Compact transmission line has the following charateristics. Firstly,using triangle arranged compact transmission lines,the natural power of the conveyor is increased by 30% than the conventional lines.Secondly,In order to improve the compactness of the line,the distances between the three phase conductor using in inverted triangular are smaller and the insulation gap is smaller than conventional circuit,which reduces the insulation strength of tower in the large span and large elevation.Thirdly,this paper put forward the suggestion of the insulation coordination of insulator should be paid attention to selection and clearance requirements for insulation altitude correction.