In the process of bundle conductor icing

downstream conductor is in the wake zone of upstream conductor and shadowing effect has an influence on air flow field and water droplet trajectories

so icing accretion characteristics are different between them.We adopted the Lagrange framework to calculate the water droplet trajectories and obtained the relations between collision coefficient and key factors.Results show that shadowing effect plays a major role in icing accretion characteristics.Collision coefficient（β） is increased with the increasing of v or MVD.Within a certain diameter

D has a negative correlation with collision coefficient of bundled conductor（β）

that is

β is decreased with the increasing of D.ΔL has no influence on collision coefficient of upstream conductor while collision coefficient of downstream conductor is rising with the increasing of ΔL.The influence on ice shape on bundle conductor surface is analyzed in this paper based on control volume and thermodynamic equilibrium equations.In addition

icing tests on 2-bundled conductor were carried out in an artificial climate chamber

and the results verified the validity of the calculation method.