Effects of Meteorological Parameters on Radio Interference of EHV AC Transmission Lines at High Altitudes

Radio interference (RI) is a key environmental indicator of extra-high-voltage (EHV) AC transmission lines. In high-altitude regions, the harsh climate and thin air result in a more intense corona discharge of the conductors, making the effects of meteorological parameters on RI even more complex. In this study, we perform statistical analysis of RI data collected over 1–2 years from three EHV transmission line observation stations located at an altitude of 1854, 3320, and 3950 m to investigate the effects of meteorological parameters on the RI level of EHV AC transmission lines at high altitudes. The correlation coefficients between RI and meteorological parameters under different weather conditions were calculated, followed by an analysis of the effects of rainfall rate, relative humidity, temperature, dew point, and other meteorological factors on the RI level. The statistical values of RI under different seasons and weather conditions were then compared. The findings are of significant importance for the measurement, prediction, and control of RI in high-altitude AC transmission lines.