×
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

Unwanted Heating from Electromagnetic Induction

Unwanted Heating from Electromagnetic Induction

Unwanted Heating from Electromagnetic Induction

(OP)
Hi,
I have a situation.
Added a large medium voltage (12.5 kV) switch enclosure to a generator circuit. Only available siting was between two large current-limiting reactors.  The switch enclosure sits approx. 6 ft. from one reactor, approx. 12 ft. from the other.  Before siting we considered that there may be some induction in the switch enclosure, but went ahead with the siting.

Now that the switch is in service, there is obvious inductive heating going on in the switch enclosure.  It is present all over the enclosure, but is especially concentrated in two places (possibly where most of the bus work is inside the enclosure.  This is a real problem when combined with solar temp. gain and high ambient temperatures.

What steps can I take to reduce the inductive heating in this switch enclosure (other than moving it)?

Are there barrier materials that will cut down the EM induction?

Note: The reactors are enclosed in vented metal enclosures, with steel side panels that are insulated to prevent large eddy currents.

Thanks,
Brian  

RE: Unwanted Heating from Electromagnetic Induction

Aluminum panel enclosures would help. Although there are still induced currents, the nonmagnetic nature of the material greatly reduces the heating from hysteresis.  Not sure how could quantify this.

RE: Unwanted Heating from Electromagnetic Induction

You may also reduce the eddy currents by making slots in the material. That will increase reistance and probably reduce eddy currents. The most effective way is to make the slots radially, emanating from the spot where the heat is concentrated. You can then, if needed, cover the slots with an insulating sheet material.

Gunnar Englund
www.gke.org

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