What is the difference between corona effect and skin effect in power transmission lines??

CORONA:

In electricity, a corona discharge is an electrical discharge brought on by the ionization of a fluid surrounding a conductor that is electrically charged.

 “Corona is a discharge caused by electrical over stress.”

The ionization of air surrounding the conductor, due to which a spark produces, this is one of the power loss during transmission.

 

SKIN EFFECT:

1. Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor.
2. In this case resistance of the conductor increases, thus increase the power loss.

1- corona effect is due to the ionization of air and decompozition of fluids ( rain water on line or moisture) and also by any injury on conductor.2- skin effect mostly occurs on solid conductor. As electricity is THE FLOW OF ELECTRONS and the nature of electon is, IT FLOW NEAR the surface. When it use less area of conductor it automatically increase the line losses. To avoid it strended counducter we use.