| With the rapid development of China’s electric power industry,power supply safety requirements of main parts of the power grid system in the lOkV outlet of the distribution network feed are increasing.However,due to the large coverage area of lOkV feeder line,the various structure,and the distribution network transmission lines of many branches,the situation of more faults brings to the company of operation and maintenance so much pressure.The main reason of the fault in the distribution network is caused by the lightning arrester,so it is very important to analyze the cause of the lightning arrester fault in the distribution network.This thesis starts from the theory of zinc oxide arrester,and it research the development and working principle,volt ampere characteristics,advantages and disadvantages,and functional characteristics of the zinc oxide arrester.It has a good theoretical basis for the analysis,the test and the disintegration of the arrester in practice.Then,the thesis gives a detailed reseach of the lightning protection of distribution network in Beijing area,focusing on the analysis of the faults occurred in the distribution network of Beijing in recent years and the understanding of its lightning protection measures.After that,the typical lightning arrester faults in Beijing area are analyzed and the lightning arrester are disintegrated.At last,the leakage current,reference voltage,impact current and square wave impulse current are tested under the laboratory conditions,and the test results are analyzed,It can be seen that the impact energy tolerance range of the measured Zinc Oxide arrester is 50-500J/cm3.This thesis carries out the statistical analysis of the distribution line faults in Beijing power grid,and carries out a number of experimental studies on the 10kV zinc oxide arrester combined with the example of Beijing power distribution network system,thus obtaining some recommendations of the operation and maintenance of power distribution network system. |
