Study on Radio Interference of ±500 kV DC Double Circuit Transmission Lines on Same Tower

There is no precedent of applying double circuit lines on same tower technology in long distance HVDC transmission project home and abroad.The problem of electro-magnetic environment is the key technique problem in building DCHV power transmission.Radio interference as the characteristic of conductor corona will directly influence the choice and arrange way of the line conductor and the settlement of the height of the conductor over the earth and the tower type.This study carried out the calculation and analysis of the radio interference of same tower double DCHV power transmission.Based on continuation of mirrorimage of F tower model,this paper researched radio interference in four different arrangement schemes for polar line and influence of line average height,splitting spacing,sub-conductors cross section and conductor number,and proposed the line parameter and arrangement scheme for polar line which satisfied with the requirement of radio interference.