×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Partial discharge / corona discharge

Partial discharge / corona discharge

Partial discharge / corona discharge

(OP)
Hi everyone,

Is there a difference between corona and partial discharge or are the two terms interchangeable? Also is some one able to shed some light on how this phenomenon occurs.

Many thanks to all who answer in advance

Regards

Norske

RE: Partial discharge / corona discharge

Corona is a partial discharge in air. It occurs when the insulating material begins to ionize or conduct due to voltage stress. In solid materials, partial discharge penetrates and chemically breaks down the insulation.

See
http://www.eatonelectrical.com/NASApp/cs/ContentServer?...

RE: Partial discharge / corona discharge

I think the reality is that most people use the two terms pretty interchangeably. Both refer to a partial breakdown usually involving the ionization of a gaseous conductor, whether in an insulation void or along the surface of a conductor.

RE: Partial discharge / corona discharge

Corona takes place in air between an electrically stressed part and the atmosphere.
Partial discharge takes place INTERNAL to a dielectric media.

RE: Partial discharge / corona discharge

DougMSOE
Sorry to disagree, but in reality the term "corona" is also often used to describe partial discharges that occur in voids of solid dielectrics. Likewise the term partial discharge also discribes the ionization around a conductor in air where a complete breakdown of the gap does not occur. The terms are used by and large interchangeabily.

One of my first jobs out of college was to do "corona" testing on underground components (connectors) using solid dielectric. As a college student, I was involved in "corona" testing of EHV overhead transmission line hardware.

RE: Partial discharge / corona discharge

Hi nostrayvoltage,

From the UK perspective I agree with DougMSOE, although it would not be the first time the US and the UK have been divided by a common language!

RE: Partial discharge / corona discharge

Suggestion: References:
1. IEEE Std 100-2000 "Dictionary"
It includes several definitions of Corona, and Corona + , e.g. Corona Charging
1a. Corona (1)(air) A luminous discharge due to ionization of the air surrounding a conductor caused by a voltage gradient exceeding a certain critical value.
(ANSI C57.19.03-1996)
1b. Corona (4) (partial discharge) (corona measurement). A type of localized discharge resulting from gaseous ionization in an insulation system when the voltage stress exceeds a critical value. The ionization is usually localized over a portion of the distance between the electrodes and the system. (IEEE 436-1977)

etc.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources