×
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

Corona (electric field) strength

Corona (electric field) strength

Corona (electric field) strength

(OP)
Clause 4.3.3 in ABB Switchgear Manual recommends designing the HV conductors below 19 kV/cm, and marginally at 21 kV/cm (I believe this is too high!), I am currently working on 400 kV station with a requirement of 16.5 kV/cm, this needs a quad conductor configuration.

Does 16.5 kV/cm limit the corona hissing? any difference if designed at 19 kv/cm?

Thanks

RE: Corona (electric field) strength

According IEEE Std 605-1998 IEEE Guide for Design of Substation Rigid-Bus Structures Annex D
Figure D.1 Allowable surface voltage gradient for equal radio-influence generation under standard conditions versus bus diameter
the allowable surface voltage gradient Eo depends [for the standard conditions of atmospheric pressure and temperature] on conductor diameter –for about 1 inch bus diameter permissible is 19 kV/cm and for 15 inches diameter is only 9 kV/cm.

RE: Corona (electric field) strength

(OP)
Should this work for OH conductors?

There will be some roughness to add up into the Eo equation, howeover, it might be misleading with the bus diameter if bundled conductors are used to lower the surface gradient (the bigger the bus, the lower the allowable surface gradient).

RE: Corona (electric field) strength

I think EPRI AC Transmission Line Reference Book—200 kV and Above, Third Edition
ch. 8.4.1 may be interesting for overhead transmission lines.

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