Three-dimensional Surface Computation Model of the Reradiation Interference From UHV Angle-steel Tower

Abstract

A three-dimensional surface simulation computation model of reradiation interference on radio station from ultra high voltage(UHV) angle-steel tower was designed intending to offer higher accuracy in the assessment of passive interference protecting distance between radio station and UHV transmission lines.Based on the wire and surface electric field integral equations of reradiation interference,the equivalent principle and the reasons for the increased error at high frequency were analyzed.In order to assure the continuity of induced current on steel tower and embody the structure of angle-steel effectively,three-dimensional surface simulation model with and without auxiliary angle-steel based on triangular element were presented.With the RWG base function and Galerkin's method,method of moments was applied to calculate the reradiation interference level of surface model,and the result was compared with that of wire model.The result shows that the values drawn from wire model and surface model have the same trend and the error gradually increases with the increase of frequency.To 0.1dB as the deviation allowable value,the surface model should be used when the frequency is over 16.7MHz.