Accession Number : ADP001681

Title :   Ice Treeing under DC and AC Electric Fields at Different Intensities of Accretion,


Personal Author(s) : Phan,Luan C. ; Laforte,Jean-Louis ; Nguyen,Du D.

Report Date : JUN 1983

Pagination or Media Count : 9

Abstract : Atmospheric ice is accreted on an aluminium conductor of 3.15cm diameter at different intensities of accretion. High voltage (ac and dc) is applied to the conductor to produce an electric field at the surface of the conductor in the same range as that existing on actual power lines. The visual aspect of ice accretion shows the formation of ice treeing with thick branches under ac and dc positive fields. The ice trees are small and their branches are very thin under negative field above -10kV/cm. From the study of corona pulses it is shown that corona streamers are responsible for the ice treeing. The results obtained show that for low and medium precipitation intensities, the amount of ice accreted under dc negative field above -10kV/cm is negligeable. (Author)

Descriptors :   *Ice, *Ice formation, *Electric conductors, *Cold weather tests, Transmission lines, Electric fields, Test equipment, Aluminum, Cylindrical bodies, Crystal growth, Density, Electrical corona, Workshops

Distribution Statement : APPROVED FOR PUBLIC RELEASE