Research On Lightning Protection Of The Mengxi-Tianjin South 1000kV UHV AC Transmission Lines

Shielding failure is the main reason to cause lightning trip-out accidents of UHV transmission lines.In a sense, the lightning performance of UHV transmission line depends on its lightning shielding failure performance, the focus of the lightning protection in UHV transmission lines is lightning shielding failure prevention.So, studying the characteristics of shielding failure trip-out and the measures to prevent shielding failure is vital significance to improve the reliability and stability of the HUV lines.in this respect,Through the elaboration of fundamental methods and concepts about lightning protection of UHV AC transmission line, For case analysis of the Mengxi-Tianjin 1000kV UHV AC transmission line that under construction, According to the lightning activity, topography and typical tower type along its route, calculate and research the shielding failure flashover rate and counterattack trip rate of the whole line using EGM and traveling wave method; At the same time, get lightning protection measures of UHV AC transmission line combined with the actual characteristics of the construction site, And apply in Mengxi-Tianjin engineering practice, improve the level of line lightning.