Environmental Impact Analysis of Radio Interference on 750‐kV AC Transmission Line in High‐Altitude Area

The design of transmission lines is being constrained by the corona phenomenon and electromagnetic environmental issues associated with extra high voltage (EHV) transmission lines in high‐altitude areas. The radio interference (RI) caused by corona has become a widespread concern due to its electromagnetic interference with radio stations. This study analyzes the environmental factors that impact the RI level of AC transmission lines in high‐altitude areas using the 7‐month test results of the Guanting electromagnetic environment observation station. The findings indicate that the RI level is relatively stable in fair weather but varies significantly across seasons. Furthermore, there is a strong linear relationship between the RI value and the common logarithm of rainfall under rainy weather conditions, and this study provides a reasonable fitting curve of RI value and rainfall. The dispersion of RI is also greater under rainy, snowy, and haze weather conditions compared with fair weather conditions. Lastly, under haze weather conditions, RI is negatively correlated with meteorological optical visibility. The results of this study have significant implications for suppressing RI on EHV transmission lines.