A basis for setting limits to radio interference from high voltage transmission lines

Radio interference generated due to corona on transmission line conductors and hardware causes a deterioration in the quality of radio reception in the vicinity of the line, especially in the AM broadcast frequency band. It is therefore necessary, from the point of view of an acceptable line design, to define allowable limits to the RI. From a study of the characteristics of RI from transmission lines and of the factors influencing the quality of AM radio reception, a number of parameters which would best describe the influence of RI on radio reception are identified. On the basis of this study, an approach is suggested in the paper for defining tolerable limits for RI from high voltage transmission lines.