◙ What is Corona Loss? ◙ Ans: When current is flowing through a conductor, the air surrounding the conductor gets ionized due to which some power loss occurs in the system. This phenomenon is known as corona loss and it can be explained more accurately. Besides air molecules, some free electrons are also present in the atmosphere. Now, when the potential across the conductors are increased, the voltage gradient surrounding the conductors are also increases. Now for the electric field generated around the conductors, these free electrons get acceleration and move with a certain velocity. These moving electrons collide with the molecules present in the air and free some electrons from the outer radius of those molecules. And after some time, the air surrounding the conductor gets ionized and finally an electron avalanche takes place and a flash over may occur. Though this case is very rare because of the design of the transmission lines. This phenomenon of ionization of air surrounding the conductors is known as Corona loss.
Posted on: Mon, 10 Jun 2013 16:10:43 +0000
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