Research And Application Of Lightning Protection Technology For Transmission Lines In Shaoguan Power Grid

Transmission lines are an important part of the power system and are responsible for the transmission of power in the power system.Because transmission lines are mostly dominated by overhead lines,long paths,and complex geographical environments,and most of them are over the mountains and across many mountains and rivers,they are vulnerable to various internal and external factors and cause fault trips.Among them,lightning trip has always been the most important factor affecting the safe and stable operation of transmission lines.According to relevant statistical data,the number of trips caused by lightning strikes accounts for 50% to 80% of the total number of trips in the year.The tripping of transmission lines caused by lightning strikes has long threatened the safe and stable operation of the power grid.The research and application of lightning protection technology for transmission lines is one of the long-term concerns of power systems.In recent years,with the rapid development of the economy in Shaoguan,the demand for power supply reliability has become higher and higher.Shaoguan City is located in the northern part of Guangdong Province,and most of the areas are mountains and hills.Due to the complex terrain and the harsh atmospheric conditions,and the transmission line corridors are mostly mountainous areas,the people are inaccessible,the line operation and maintenance workload is large,and the tasks are heavy.However,the situation of the transmission line tripping caused by lightning strikes in the Shaoguan power grid has occurred frequently.Therefore,it is urgent to study the application of lightning protection technology for transmission lines,effectively improve the lightning resistance level of transmission lines,and reduce the lightning trip rate of transmission lines.This paper takes Shaoguan Power Grid as the research object,and discusses the research and application of lightning protection technology for transmission lines.The full text is divided into five parts.The first part is the introduction,which mainly leads to the purpose and content of this paper.The second part mainly introduces the scale and operation of the transmission circuit of Shaoguan Power Grid.The third to the fifth partare the key parts of this paper.Before conducting the research on lightning protection technology of transmission lines,it is necessary to determine which areas of the transmission lines need lightning protection and which areas are not needed.Therefore,there is the third part and the third part of this paper.Some of them mainly study the distribution of minefields in Shaoguan Power Grid and determine the key areas for lightning protection of transmission lines.The fourth part is the research on lightning protection equipment and lightning protection measures.The fifth part is selected in the key lightning protection areas identified in the third part.The application of lightning protection technical measures for the fourth part of the transmission line set up in the same tower was determined,and the implementation effect of lightning protection technical measures was verified.Because the typical mountainous transmission lines are selected,the research results of this paper can provide a good reference value for lightning protection of mountain transmission lines.Firstly,this paper introduces the background and purpose of this paper.Shaoguan is a mountainous city in northern Guangdong.The lightning protection work of transmission lines is very important and the task is arduous.Based on the research status at home and abroad,the general methods and methods of lightning protection work for transmission lines are analyzed.The composition of the full text and the research content have opened the topic for this article.Secondly,starting from the operation scale and operation status of Shaoguan power grid,the importance of lightning protection of transmission lines on the operation of Shaoguan power grid is analyzed in detail.Then,the detailed research and demonstration of the distribution of minefields in Shaoguan Power Grid is carried out.The lightning protection measures of the corresponding transmission lines in different levels of lightning strikes are also different.The analysis shows that Wengyuan County has the highest frequency of lightning activity and is at The lightning risk level III area is the key lightning protection area of Shaoguan Power Grid.Furthermore,the current lightning protection equipment for transmission lines and lightning protection design principles are introduced,and specific lightning protectiontechnical measures are proposed.At the same time,according to the lightning risk level area of Shaoguan Power Grid,technical measures for lightning protection are proposed,namely: The Class II risk zone tower can keep the lightning protection design unchanged.The transmission line of the Class III risk zone is modified by lightning protection optimization.The transformation measures mainly include improving the grounding device,installing the line arrester and installing the parallel gap.Finally,taking the application of lightning protection technology for Shaoguan power transmission line as an example,110 k V Wengtie A and B lines,which are located in the Wengyuan County area and with a lightning risk level of III,were selected as pilot projects for lightning protection measures.The effect of mine measures transformation,because Shaoguan Power Grid belongs to mountain power grid,the methods and measures proposed in this paper have the value of popularization and application in mountainous transmission lines.