Research On Lightning Protection Of 110kV Transmission Lines In Yangzhou Power Grid

According to the known power system faults,transmission line faults account for the main part,and the number of transmission line faults caused by lightning trip is the highest.Therefore,in order to improve the security and stability of power grid operation,effectively reduce the lightning fault of transmission lines,so as to fundamentally reduce the frequency of lightning accidents in the power grid,the new lightning protection technology is studied.The occurrence of lightning activity has a strong randomness,and the various factors are extremely complex.Therefore,the research on the understanding of transmission line lightning damage in the world is still very shallow,and many unknown factors have not been fully investigated.Firstly,the lightning current situation in Yangzhou area is analyzed,including the general situation of Yangzhou Power Grid,the lightning activity in Yangzhou area,its regional distribution and the previous lightning trip data.The statistical classification of transmission line tripping caused by lightning stroke is analyzed from different angles.Combined with a lightning trip fault case,the fault data is analyzed,the fault causes are judged,and the lightning protection guidance is given.Combined with the lightning trip in Yangzhou area,based on the conventional lightning protection measures,this paper studies the new lightning protection technology,including the anti counterattack lightning and the new method of reducing the grounding resistance.The simulation tower model is established to carry out the test analysis of different lightning protection measures,such as erecting lightning protection coupling line,installing lightning rod,reducing the grounding resistance between the tower and the earth,which can improve the lightning protection effect to a certain extent.Finally,taking the 110 kV Guangheng line of Yangzhou Power Grid as an example,the risk level of lightning trip of the transmission line is divided,and various factors that may cause lightning trip are considered respectively.And corresponding improvement measures are given according to the different risk levels and the specific situation of the tower.The measures such as strengthening the insulation and reducing the protection angle of the lightning line effectively reduce the probability of lightning trip,It provides a new idea for lightning protection of 110 kV transmission line in Yangzhou Power Grid.