The dielectric distributed around the surface of electrodes has significant influence on the corona discharge. Corona discharge in power transmission lines in fine weather is different from that in rainy days as the surface condition is greatly changed. The surface of conductors is filled with the drops of rainwater; hence, the electric field around the conductors will be distorted. Corona cage is an effective and economical means for duplicating corona progress in power transmission lines with lower voltage on the conductor in the cage. The practical conductor was utilized in this experiment in both fine and rainy weather, and three rain rates were taken as 101.2mm/hr, 153.5mm/hr and 208.1mm/hr. The process of corona discharge was recorded and investigated, it was founded the corona discharge turned to be much more intense when the rain drops was enlarged and more compressed around the conductor. The corona inception voltage which is an important parameter of corona discharge was also gained through the Ultraviolet (UV) Imager. The radio interference (RI) level and audible noise (AN) level of the three rain rates and dry condition were compared.
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