Calculating Method of Radio Noise Level and Its Application to Design of AC Power Transmission Line

The calculating method of the radio noise (RI) level of an extra-high-voltage (EHV) line is proposed. The mean value and standard deviation of the RI level in fair weather and the average RI level of the wet conductor at a rate of rain can be easily predicted by the calculating equations. Moreover, when an EHV line is designed, the conductor of the suitable diameter can be chosen easily and precisely by the application of this calculating method, as no disturbance given to the radio receiver exists at the RI levels of its line.