Based on the background of urban development of transmission lines floating object prevention thinking（LEC）

This paper analyzes the current situation and preventive measures of the floating objects in the main grid of EHV transmission in the south of our country in the past five years, defines the types of floating objects and the high-frequency environment, uses LEC model to quantify the risk, and refines various parameters, adjust the impact factors, directly reflect the risk level of floating objects, effective hierarchical management and control, establish scientific preventive measures.