Analysis Of Multiple Lightning Overvoltages In Tuned Half-wavelength Transmission Lines And Differentiated Lightning Protection Strategie

While clean energy hydropower is primarily distributed in China’s Yunnan,Sichuan,and Tibet,wind power and photovoltaic are primarily distributed in Xinjiang,Inner Mongolia,and Qinghai,it can be seen that clean energy is primarily distributed in the western region of China,while load centers like Jiangsu,Zhejiang,and Shanghai,Be,are mainly distributed in the eastern region of China.As a result,the distribution of China’s economic centers and energy sources shows that the country urgently requires long-distance,high-capacity,and high-voltage transmission lines.Tuned halfwavelength transmission technology has promising application potential as a longdistance transmission technology with superior economy,stability,and transmission capacity.But,other difficulties also arise,which will have more severe repercussions once the line has been struck by lightning several times.This study first modeled tuned half-wavelength transmission lines.Based on these models,it then examined the effects of multiple lightning strikes on tuned circuits,transmission lines,circuit breakers,and other overvoltages.Finally,it introduced a method for calculating lightning protection against winding and striking back with the aim of presenting various lightning protection strategies for winding and striking back.The breaker model and lightning arrester model are introduced on the basis of the tuned half-wavelength transmission line model created for the UHV demonstration project.Additionally,the mechanism of multiple lightning strikes is introduced,and the lightning current model used in this paper is chosen based on these mechanisms.In order to mimic the line side and station side of several lightning strikes,RTDS was developed based on these models.The over-voltage inside the tuned circuit of the CLC is lower than that of the LCL,and the over-voltage on both sides of the lightning strike phase of the tuned circuit is higher than that of the adjacent measurement points inside,according to this paper’s investigation into the effects of direct lightning and lightning intrusion waves.This paper also investigates the effect of multiple lightning strikes on the line overvoltage,specifically through RTDS simulation,and came to the conclusion that multiple lightning strikes transmission lines may be non-lightning strike overvoltage than the lightning strike,and that this is typically because the tuned halfwavelength transmission line is too long and the short interval between multiple lightning strikes caused by the superposition and accumulation of wave The investigation and analysis of the overvoltage induced by several lightning strikes on circuit breakers,which focus on the dangers associated with subsequent automated reclosing,serve as the paper’s conclusion.Through simulation and analysis,it was determined that when the circuit breaker is in the process of extinguishing the arc,the breaking overvoltage of the circuit breaker will still be present at this time.The overvoltage caused by subsequent lightning strikes is simply superimposed on the circuit breaker contacts,making the overvoltage there extremely high.If the automatic reclosing occurs at this time,the circuit breaker may be damaged.The gadget is prohibited.Because the half-wavelength transmission line is too long and typically passes through the pass,mountain ridges,valleys,and waters,four different types of terrain,different anti-bypass and anti-backlash measures can be applied depending on the effects of multiple lightning strikes on the station side of the tuned half-wavelength transmission system and line side overvoltage.