Prediction of Egyptian 500 kV Overhead Transmission lines Radio- Interference by Using the Excitation Function

This paper presents applications of the excitation function on the prediction of the RadioInterference (RI) of overhead transmission line, due to corona effect. These applications are done under different weather conditions such as: heavy rain, wet conductor and fair weather. Also, this paper investigates the factors influencing the RI level namely; the height of conductors, phase spacing, number of subconductors in the bundle, diameter of subconductor and subconductor spacing in the bundle. In this paper, it is shown that the RI level is dependent on the weather conditions. Where, the RI level under heavy rain has the maximum level, hence, it should be considered as a basic level of any overhead transmission line (OHTL). Key-Words: Corona, Excitation function, Radio interference, Overhead transmission line