During the process of the energized icing on transmission line

partial corona discharge will be produced by the behavior of the water drops around the conductor surface

and the discharge could be more obvious after rime icing

which will threat the safe operation and economic benefits of the transmission lines. Although the corona discharge characteristics under dirty or rain conditions were studied intensively by the scholars

there is no research on dynamic characteristics during the icing process has been reported. In this paper

the authors make energization of rime icing in the artificial climate chamber

the Q-U method is applied to measure the change of corona discharge and discharge power. Results show that different surface potential leads to various short-time corona discharge or discharge power

and the quantity will be increased with the field strength. The icing time will increase the quantity of the corona discharge and discharge power first

and then it will be saturation and slightly reduced. The maintain discharge will be increased gradually under the strong electrical field. The conclusion of this paper can provide a theoretical basis for revealing the corona characteristics of the transmission line in the rime area.