Analysis of the influence of airflow wind angle and wind speed on the flow field distribution characteristics near double I-string composite insulators in transmission lines

Abstract In strong wind environments, changes in airflow patterns can affect the degree of deflection of insulator skirts. Deflection or tearing of composite insulator skirts can reduce their insulation performance. This article takes the double I-string composite insulator of the 330 kV transmission line as the research object. The wind angles are set as 0°, 16°, 30°, 60°, and 90°. The wind speeds are set as 5m/s, 10m/s, 20m/s, 30m/s, and 40m/s. The simulation results show that under the 0° windward angle condition, the upstream insulator completely blocks the airflow. The flow state near the double I-string changes with the variation of airflow velocity. The flow states on the high, medium, and low voltage sides of the upstream and downstream insulators are different. In future research, it may be considered to analyze the impact of airflow on the long-term performance of insulators and provide a reference for the optimization of insulator umbrella skirt structures.