What is Corona Discharge And it's effect on Transmission Lines: What is Corona Discharge and it's effect on Transmission Lines. This phenomenon occurs when the electrostatic field across the transmission line conductors produces the condition of potential gradient. In transmission lines, conductors are surrounded by the air. Air acts as a dielectric medium.ir Advantages & Disadvantages of Corona Effect: Advantages: Due to corona across the conductor, the sheath of air surrounding the conductor becomes conductive which rises the conductor diameter virtually. Disadvantages: A non-sinusoidal voltage drop occurs in the transmission line due to non-sinusoidal corona current, which causes interference with neighboring communication circuits. Factors Affecting Corona Discharge: The phenomenon of electric discharge associated with energized electrical devices, including transmission lines results in a power loss. The following factors can change the magnitude of the Corona Effect: Supply Voltage: As the electrical corona discharge mainly depends upon the electric field intensity produced by the applied system voltage. Air Density Factor: Air density factor also determines the corona loss in transmission lines. The corona loss in inversely proportional to air density factor. Learn more about Corona Effect at www.allumiax.com