Real-Scale Measurement Results for Audible Noise from AC Overhead Transmission Lines and Prediction Formula in Heavy Rain

Abstract

The audible noise produced by corona discharge from AC overhead transmission line conductors is one of the major factors affecting the design of conductors, particularly for transmission lines with voltages above 500 kV. The audible noise has two components, which are random noise with frequency components from several hundreds to 20 kHz and pure tones with a power line frequency and frequency components of its even multiples.
In this paper, measurement results for random noise in heavy rain using a real-scale facility, namely, UHV corona cage, which has a cross section of 8 m×8 m and a length of 24 m, are shown and a new prediction formula for the sound level of random noise in heavy rain is proposed.