Abstract: The distribution network is an important component of the power system, and its operating status affects the stability and safety of the power system directly. However, due to the characteristics of the distribution network itself, its failure rate is relatively high and there are many types of faults, which has a great impact on the normal operation of the power grid. Therefore, studying the fault phenomena in the distribution network, identifying their causes, and adopting effective operation and maintenance management methods are of great significance for improving the operational efficiency and safety level of the distribution system.

Key words: distribution network and distribution lines, common faults, operation and maintenance