Conductor galloping is common during the operation of transmission lines

which may result in electrical and mechanical accidents of the transmission line. In order to ensure the safety and stable operation of power grid

it is necessary to study the characteristics of galloping deeply. The multi-span 3-degree-of-freedom（3 DOF） dynamic model for conductor was established in this paper

and the aerodynamic parameters were calculated by the Fluent software

and the research on a 500 kV iced quad bundle conductor galloping was also conducted in detail. Based on the explicit central difference integral algorithm

the galloping conditions under different wind speeds

ice thickness

wire types were discussed

and the results under sudden ice shedding were analyzed. The research results show that the amplitude between the minimum and maximum wind velocity that leads to gallop will increase almost linearly corresponding to the wind velocity; the increasing ice thickness makes the conductor easier to gallop

but too large thickness will destroy the conductor galloping; under the same ice cover

the small cross-section conductor is easier to produce galloping; sudden ice shedding will rapidly decrease the galloping amplitude

leading to a small vibration. The research results have a certain guiding effect on the prediction of the amplitude of the 500 kV wire in actual engineering under different meteorological conditions and the application of anti-dance technology.