Start networking and exchanging professional insights

Register now or log in to join your professional community.

Follow

What is Corona discharge in Power Transmission Lines?

user-image
Question added by Ahmed Eltayeb , Projects Electrical Engineer , Khatib & Alami CEC
Date Posted: 2014/07/07
Mahmood Shaikh
by Mahmood Shaikh , Assistant Manager Electrical & Instumetation (E&I) , Aisha Steel Mills Private Limited (Steel Industry)

The corona will occur on transmission lines when the strength(potential gradient) of the electric field around a conductor is high enough to form a conductive region, but not high enough to cause electrical breakdown or arcing to nearby objects. It is often seen as a bluish (or other color) glow in the air adjacent to pointed metal conductors carrying high voltages, and emits light by the same property as a gas discharge lamp.

 

The ionized gas of a corona is chemically active. In air, this generates gases such as ozone (O3) and nitrogen oxide (NO), and in turn nitric oxide (NO2), and thus nitric acid if water vapor is present. Ozone is unintentionally created this way

Deleted user
by Deleted user

electrical discharge brought on by the ionization of a fluid surrounding a conductor that is electrically energized

Muhizi Jean Claude
by Muhizi Jean Claude , Head of Quality Control , Sahasra.Pvt.

A corona is an electrical discharge brought on by the ionization of a fluid such as air surrounding a conductor that is electrically charged.Corona discharge from high voltage electric power transmission lines constitutes an economically significant waste of energy for utilities.  

Sahil Billawria
by Sahil Billawria , SITE SUPERVISOR/ELECTRICAL , IRCON INTERNATIONAL LIMITED (GOVT. OF INDIA UNDERTAKING)

CORONA IS AN EFFECT IN OVERHEAD TRANSMISSION LINES.IT GENERALLY OCCURS ON THE ROUGH SURFACE OF CONDUCTOR DUE TO OVER VOLTAGE BY PRODUCING A BRIGHT LIGHT WITH HISSING SONG.THE OVERVOLTAGE CAUSES A LARGE CURRENT IN THE CONDUCTOR WHICH ACTUALLY IONIZED THE WHOLE AIR PARTICLES ARROUND IT BY PRODUCING OZONE GAS.

Badar -Ul-Zaman
by Badar -Ul-Zaman , Electrical Engineer , K-Pax Construction W.L.L

Corona mainly occurs due to air ionization and if the conductor is injured. Mostly the spark has been seen where there is an injured point at conductor ( even there also air get ionized ).....

HASNAIN JAWAD
by HASNAIN JAWAD , Junior Electrical Engineer , NESPAK

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.

Safi Ullah
by Safi Ullah , Electrical Trainee Engineer , PESCO (Peshawar Electric Supply Company)

The ionization of air surrounding the conductor...............................

Producing sound.............................................

Producing spark.......................................

This is a major type of power loss during transmission..................................

More visual in stormy weather.

 

Ilamparithi Boologa Sundara Vijayan
by Ilamparithi Boologa Sundara Vijayan , Procurement and Contracts , Fortune engineering and energy services

Current / electrons have the tendency to flow on the surface of the conductor, these free electrons Ionize the air surrounding it and energize its voltage level but does not results in breakdown.

Rajendra Deshpande
by Rajendra Deshpande , Senior Project Engineer , PROFESSIONAL EXPERIENCESaudi Electricity Co

Its ionisation discharge across conductor surface dissipate power, generally visible in rainy atmosphere.

Muhammad Farhan  Yaseen
by Muhammad Farhan Yaseen , Lead Electrical Execution Engineer , Descon - Qatar

The air around trnsmission line conductor is ionized and gives oftenly a spark this effect is known as "Corona effect". It usually happens in high voltage transmission lines.

More Questions Like This