Electric Field Characteristic and Corona Performance of 1000 kV AC for High-Altitude Transmission Lines

Due to the uneven distribution of energy resources across China, transmitting electricity from the west to the east is an important solution. However, some regions in western China have an altitude exceeding 4000–5000 m, making it necessary to conduct research on the corona characteristics of high-altitude transmission lines. This paper employs the finite element method to calculate the electric field distribution characteristics of 750 kV AC high-altitude lines. Furthermore, corona characteristics of high-altitude 750 kV lines are measured using ultraviolet imaging detection technology, which verifies the accuracy of the calculation method. Additionally, this study calculates the electric field distribution of 1000 kV AC high-altitude lines with Gan-type tower and investigates the effect of different conductor sizes. The results of this research can provide guidance for the design of high-altitude transmission lines.