Table of Contents
What is corona formation?
As corona is formed due to ionization of air surrounding the conductors, there-fore, it is affected by the physical state of atmosphere. In the stormy weather, the number of ions is more than normal and as such corona occurs at much less voltage as compared with fair weather.
What is the definition of electric corona?
Corona is a luminous, audible discharge that occurs when there is an excessive localized electric field gradient upon an object that causes the ionization and possible electrical breakdown of the air adjacent to this point. Corona is characterized by a colored glow frequently visible in a darkened environment.
What is corona effect how do you reduce it?
By increasing conductor spacing : By increasing the spacing between conductors, the voltage at which corona occurs is raised and hence corona effects can be eliminated. However, spacing cannot be increased too much otherwise, the cost of supporting structure may increase to a considerable extent.
What are the causes of corona effect on a transmission line?
Raindrops, snow, fog and condensation accumulated on the conductor surface are also sources of surface irregularities that can increase corona. Air Density Factor: Air density factor also determines the corona loss in transmission lines. The corona loss in inversely proportional to air density factor.
What is the reason of corona?
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What is corona in substation?
Corona Discharge (also known as the Corona Effect) is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor that is electrically charged. This is common in high voltage electric power transmission lines.
What is corona effect in transmission?
Corona is a phenomenon associated with all transmission lines. Under certain conditions, the localized electric field near energized components and conductors can produce a tiny electric discharge or corona, that causes the surrounding air molecules to ionize, or undergo a slight localized change of electric charge.
What factors affect corona?
There are numerous factors such as system frequency, system voltage, air conductivity, air density, conductor radius, surface of conductor, load current and atmospheric conditions, on which the corona loss depends.
What are the advantages of corona effect?
The main advantages of corona effects are: Due to corona across the conductor, the sheath of air surrounding the conductor becomes conductive which rises the conductor diameter virtually. This virtual increase in the conductor diameter reduces the maximum potential gradient or maximum electrostatic stress.
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