The electrical characteristic of insulator after ice coating will be decreased seriously

which leads to frequent flashover accident of transmission line and therefore has been highly concerned by scholars both at home and abroad. Although a large number and deep work on the study of ice coating of insulator have been done by the scholars from different countries

yet most of them adopt the single insulator strings for ice-coating study. With the continuous development of the UHV power grid

the ice coating of parallel insulators string has received great attention

but the related study result is rarely reported. In this paper

the artificial climate chamber is used to coat the ice on the series and parallel insulator and the influence of different atmospheric parameters on the ice coating characteristic is studied. It is shown by the study that the ice thickness of series and parallel insulator nonlinearly increases with the increase of temperature T

wind velocity v and water droplet diameter MVD. Atmospheric parameters at initial ice-coating stage have great influence on the ice thickness and slow down with the increase of time.The insulator string with different layout are free from both temperature and water droplet diameter

while the ice coating influence of insulator string at different layout by wind velocity is great. In case of small atmospheric wind velocity of series and parallel insulator

its ice coating thickness is most identical. However

with of increase of wind velocity

the ice coating of parallel insulator string is more serious than that of single string. The conclusion in this paper is helpful in the study on the icing flashover characteristic of multiple series and parallel insulator for UHV transmission line.