Abstract: This paper analyzes a 220 kV substation bird fault trip accident, the location information of the faulty pole and tower was determined by combining the analysis of the environment of the fault section and the analysis of the distributed fault locating device. The fault cause was that birds excreted standing above the hanging point of the windproof offset insulator. The waste causes the breakdown and discharge of the air gap between the upper and lower pressure equalizing rings of the insulator. In this paper, put forward follow-up corrective measures, the pole tower to supplement the installation of anti-bird thorns, ultrasonic bird to prevent bird to bird and other anti-bird devices, targeted to strengthen the line anti-bird damage work, constantly improve the power grid line management level, to ensure the stable operation of the power grid.