Abstract: This paper is proposed to analyze the dynamic response of the tower-line system subject to ice shedding. The existing steel cross arms and the improved composite ones are to be analyzed. The before and after improvement of finite element models for a four-span transmission line system are built by ANSYS. The overhead conductor with ice-coating and ice-shedding are simulated by using the modifying density method. The results show that composite cross arm tower can effectively increase electrical safety distance when the conductor jumps with ice shedding and prevent flashover accident. Furthermore, by selecting appropriate length of electrical fittings, the adverse impact of ice shedding on the composite cross arm can be effectively reduced.

Key words: composite cross arm tower, improvement, icing to transmission line, ice shedding, vibration, the finite element