Abstract: Analysis and Prevention of Common Faults in Distribution Grids in Local Area Tianyu.bai, Haike.li，Gang.liang State grid Tianjin dongli electric supply company Abstract With the increasing demand for high-quality power supply to the distribution network, as well as random and uncertain new energy being continuously connected to the power grid, the data source, scale, and type of power grid regulation are rapidly expanding and enriching, and regulating and managing services to massively multi-sourced data. The requirements of analysis and processing have been continuously improved. How to use the value of power grid operation and management data, improve the level of power supply service, and reduce the loss of power outage become a key issue. This paper first analyzes the common faults in the operation and management of the power grid in Dongli District of Tianjin, and makes a corresponding treatment, and then analyzes the protection and management of power grid faults. It is hoped that the analysis of this paper can help improve the efficiency and level of power grid operation management and ensure the safe and stable operation of the power grid system. 1. Introduction 2. cable failure Figure 1. Cable faults in 2014-16 in Dongli Power Grid region 3. overhead grid failure Figure 2. 2014-2016 Overhead Grid Failures in Dongli Power Grid Region 4. fault reclosing situation Figure 3. Success rate of distribution grid Reclosing in 2014-16 of Dongli Power Grid Region 5. Regional power grid faults and seasonal relations Figure 4. Faults in the four seasons of 2014-2016 overhead grids in the Dongli Power Grid region 6. Prevention and judgment 7. Conclusion The impact of distribution grid faults on the power system is very obvious, and the destruction of power system stability and safe operation is also very large. This paper mainly elaborates the breakdown of various distribution grids during the 2014-2016 period in the Tianjin Dongli Power Grid, including cable faults, overhead grid faults, and fault assignments in spring, summer, autumn, and winter. Keywords: Grid Operation; Power Grid; Operation Management; Big Data; Failure analysis Author’s brief introduction and contact information: Tianyu.bai State grid Tianjin dongli electric supply company 18522291551 baity_1987627@126.com Xi er Road ;Tianjin port free trade zone; Tianjin