With the consideration of conductor-ground contact, damping coefficient, bundle numbers and spacers, a seven continuous span FEA model of conductors and insulators was established. Under different load cases, the dynamic responses of the broken conductors were analyzed. The calculated results are well agreed with the experimental values, and the rationality of the FEA model was verified. The unbalanced tensions from broken conductors are almost same with and without conductor-ground contact. When all the sub-conductors are not broken simultaneously, the unbalanced tensions calculated by the model with spacers are much lower than those by the model without spacers. For suspension towers in 20mm and 30mm icing areas, the tensions calculated by the static analysis method are a little lower than the limit values in the regulation. For other icing areas, the calculated values are higher than the regulated values by about 10 percentages. Four sub-conductors of the eight bundle conductor are assumed broken in the dynamic analysis. The tensions from broken conductors are lower than the regulated values.