Research And Application On Lightning Protection Technology To Transmission Lines In Laiwu City

With the rapid growth of our society and economy,the development of the power gird construction is growing faster and faster,and the mileage of the power lines is increasing dramatically,which means the impact of electric power on people’s life and work is profound.As a result,people require the enterprises of the power grid provide safe and stable power.The safe operation of the overhead power lines not only has direct influence on the power transmission,but also affects the stability of the whole power grid.Once the power grid malfunctions,huge economic damage,or even the safety accident will be unavoidable.According to related statistics,the biggest threat to the safe power operation is lightning.So it’s vital and necessary to strengthen the lightning protection and reduce the lightening accident.The thesis mainly analyzes the lightening fault in overhead transmission lines and overhead distribution lines,and separately proposes specific lightning protection measures based on actual situation of Laiwu City.The thesis firstly introduces how the lightning happens,explains why the overhead power lines trip as lightening happens,and introduces the computing method of inductive thunder overvoltage and direct lightning overvoltage.The paper also introduces some common lightning protection methods in overhead transmission lines and overhead distribution line,and elaborates theories,merits and demerits,and suitable conditions.In the second part.,the thesis analyzes the lightening protection measures in overhead distribution lines,and conclude different lightening-proof effects through simulation analysis Last but not least,according to the statistics of trip by lightning strike in recent years of Laiwu City,the thesis c the reasons of the lightning tripping and the regular pattern of the malfunction.Based on typical cases,the paper points the shortage of present lightning protection and put forward solutions to these problems,which may provide some solutions for reference to the reduction of the lightning tripping in Laiwu City or in other areas which shares the similar landform with Laiwu City.