Research On Lighting Protection For Transmission Lines With Special Type

As a significant part of the power grid, transmission line undertakes the difficult task of safe and reliable transmission of electricity. With the variation of environment in recent years, lighting caused transmission line trip occur more and more constantly. It not only causes malignant consequence such as equipment damage as well as blackout, but also greatly affects the people’s daily production and life. Therefore, it’s an important task in grid operation to improve the measures of Lighting Protection for Transmission Line (LPTL) to ensure the safe and stable operation of transmission line. In this paper, performance of LPTL on different tower type in fault frequently occurs area is researched, aiming to fully optimize the Performance of Lightning Protection (PLP).Firstly, lightning trip fault of various types’ transmission lines have been investigated. Lightning faults and lightning activities are Statistical analyzed, Mainly focusing on the current situation and rectification demand of lighting trip fault. The characteristics of lightning trip fault for compact and multi-circuit transmission line are analyzed. Technical requirements have been identified according to the rectification demand.Secondly, characteristics as well as weakness of lightning protection on special line type have been further analyzed, based on previous work. The optimization and ratio effect of transmission line fittings, wires and tower window has been researched. Target Lightning Protection Measures (LPM) such as tower window optimization, and insulation coordination have been proposed according to the transmission type.Finally, the current lightning protection technology has been optimized. A set of scientific and effective PLM and modification scheme has been formed, which includes ground resistance reformation, insulator string optimization, lightning protector installation, reducing ground wire protection angle and tower window size adjustment. The specific implementation of technical requirements have been put forward, and the effect of PLM has been evaluated. The proposed measures of lighting protection for transmission line with typical type discussed in this paper provide a strong guarantee for improving the PLP of transmission line and promoting the stable operation of the grid.