| Power grid is a power supply facility that directly serves users.The distribution network covers a wide range of areas and has a large number of equipment and facilities,so lightning strikes are more likely to occur.Compared with the transmission network,the distribution network has great limitations in lightning protection.Considering the poor insulation properties of the distribution network,direct lightning and inductive lightning are likely to bring great damage to the distribution network.When lightning falls close to the line,electromagnetic induction will occur in the distribution network wire,and the over-voltage will be at least twice as large as the line voltage,which will seriously damage the insulation structure and cause various accidents.When the line is struck by lightning,the impedance of the line to the ground will have a huge potential difference due to the lightning current,so the insulator will flashover.Although the current distribution line lightning protection has been carried out a lot of research,and put forward the installation of lightning protection device,strengthen the line insulation,install automatic reclosing device and other lightning protection measures.However,due to the various wiring forms of distribution lines and the complex environment of the lines,the lightning protection measures implementation scheme and the installation method of lightning protection devices for distribution lines under the conditions of different external environments,tower structures and wiring modes have not been clear yet,and the lightning protection effect has not been fully played.In addition,due to the following 10 k V distribution lines usually do not use direct lightning protection measures,because of direct lightning power distribution lines caused by disconnection,trip accidents also occur.Therefore,according to the different external environment,tower structure and line wiring mode,the protection effect and technical economy of different lightning protection measures are studied,and the implementation plan of lightning protection of distribution line is put forward,which is an urgent problem to be solved in the lightning protection of distribution line.This project will be based on the actual engineering,combined with the Anshan Power Supply Company 10 k V distribution network in the process of operation of the lightning analysis,to discuss the distribution network lightning protection and the possible lightning problems.The lightning protection measures and related influencing factors of distribution lines in different environments and wiring forms are studied.Through theoretical research,simulation experiment and simulation calculation analysis,the lightning protection performance of distribution lines under various conditions is evaluated,the comprehensive lightning protection measures are put forward,and the corresponding line lightning protection construction scheme is formulated,so as to improve the lightning protection performance of distribution network and the reliability of power supply.Through the study in this project,according to different environment,the structure of the tower and line connection mode of distribution line of the installation of lightning protection methods and measures of lightning protection scheme,based on the distribution circuit induction lightning protection,to give attention to two or morethings line lightning protection,in meet the distribution line lightning protection and safe operation of the system under the condition of technical requirements,realize the construction of economy. |
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