Research on Variation Law of Collision Coefficient of Super-cooled Water Drops in Transmission Lines

Ice-coating of overhead transmission lines will cause serious line disasters and seriously threat-en the safe operation of the power grid system. This paper uses finite element analysis software to numerically simulate the collision process of supercooled water droplets, and analyzes the influence of wind speed, diameter of supercooled droplets, electric field and other influencing factors on the collision coefficient of supercooled water droplets. The research results show that under no electric field, the collision coefficient of supercooled water droplets is positively correlated with wind speed and diameter of the supercooled droplets, that is, the greater the wind speed, the larger the diameter of the supercooled droplets, the greater the collision coefficient of the supercooled droplets, and the maximum value of the collision coefficient is close to At 1. When the wind speed is low and the diameter of the supercooled water droplets is small, the collision coefficient of the supercooled water droplets under the action of the electric field is lower than the collision coefficient under the action of no electric field, indicating that the electric field effect weakens the collision process of the supercooled water droplets. By studying the collision process of super-cold water droplets in the transmission line, it provides technical reference for the safe operation of the transmission line.