Study on differentiated lightning protection for 10 kV distribution lines

Distribution lines are susceptible to induced lightning overvoltage and lightning accidents, the installation of lightning protection facilities on the distribution line can effectively reduce the impact of induced lightning overvoltage on the line, the conventional lightning protection facilities are installed without taking into account the topography of the line is located in the problem, resulting in poor technical economy, there is a certain degree of blindness.This paper establishes an induced lightning overvoltage calculation model in ATPDraw, simulates and analyses the level of induced lightning resistance of the line when the line is equipped with different lightning protection facilities as well as different densities of installation. According to the topographic and geomorphological characteristics of Guangxi,distribution network line tower spacing, conductor type and regional minefield level, the distribution line lightning protection level is divided into A, B, C, D, E five levels, corresponding to the design of different lightning protection scheme. Finally, through the comparison of lightning parameters before and after the lightning protection transformation of two 10kV distribution network lines, it is verified that the differentiated lightning protection scheme proposed in this paper can effectively improve the level of lightning resistance of the line and reduce the impact of induced lightning on the line, improve power supply reliability and reduce operating costs, while the relevant research conclusions can guide production practice and reduce the pressure on first-line workers to overhaul.