Study on Fluid-Solid Coupling Galloping Characteristics of Overhead Conductors Under Different Icing Forms

Icing galloping of overhead conductors will lead to wire breakage, fittings wear, and even tower collapse accidents, which may lead to large-scale power outages. In order to study the galloping law of conductors with different icing forms, this paper takes the 110 kV transmission line of Liannan line as the research object. Based on the aerodynamic theory, the analysis model of wind-induced vibration response of conductors with different icing forms is established. The time history analysis of each iced conductor model was carried out by fluid-solid coupling method. The results show that the most galloping wind attack angles of crescent, fan and D-shaped iced conductors are around 20 °, 160 ° and 60 °, respectively. With the increase of icing thickness, the galloping velocity of the conductor decreases significantly. Under the same conditions, the galloping amplitude of crescent-shaped iced conductor is the largest, followed by fan-shaped, and D-shaped is the smallest. When the velocity is small, the galloping amplitude of the conductor increases with the increase of velocity. When the velocity reaches a certain value, the galloping amplitude of the wire decreases with the increase of the velocity. The research results can provide an important reference for the study of icing galloping law of overhead conductors.