The accumulation of pollution particles on insulator surface can reduce the insulation property of insulator string, which may result in pollution flashover accident of power transmission lines. This paper conducts modeling and analysis work to study the collision deposition process of contamination particles on composite insulator surface. Based on the adhesion force in the process of collision, the damping force caused by viscoelasticity of insulator material and the energy loss caused by the first collision contact are considered. The collision separation point is calculated through the motion equation of the collision process, and the critical velocity of the collision separation is obtained based on the energy conservation law. A particle collision deposition model is established by considering the factors of contact circle size, particle collision deformation, particle critical velocity and rebound velocity. Based on the proposed model, mathematical simulation is carried out, and the influence of grain size on the deposition of pollution particles on composite insulator surface is analyzed. Finally, the rationality of the model is demonstrated by comparing with the existing wind tunnel test results, which provides a reference for the study of composite insulator surface pollution deposition mechanism.

Composite insulator, Pollution deposition, Collision dynamics, Deposition model