×
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

Trying to calculate skin effect ratio for rectangular section.

Trying to calculate skin effect ratio for rectangular section.

Trying to calculate skin effect ratio for rectangular section.

(OP)
Hello,

  I am trying to compute the skin effect ratio of a rectangular section that is 44mm tall and 25.4mm wide with a known length of 251.4mm.

The AC current is defined as being 133 Hz at 1350 Amps through this conductor.

I am using this formula from this website.

http://www.copperinfo.co.uk/busbars/pub22-copper-for-busbars/sec4.htm

The table is near the bottom of the page and is used for rectangular section.

The formula calls for me to calculate the x-axis:

SQRT(frequency / R_0(for 1000m))

When I calculate the above value I get about 2800. This seems wrong as the X-axis does not extend that far and I do not believe I should have to extrapolate out that far.

The way I understand it, R_0(1000) = resistance for 1000m

frequency = Hz

When I do the calculation I use SQRT(133Hz / 1.68x10-5) = 2800

What am I doing wrong? My X-axis should be somewhere between 0 and 100. 2800 is way too high?

Please advise,

 Thanks!

RE: Trying to calculate skin effect ratio for rectangular section.

(OP)
I just answered my own question.

I forgot to divide Resistivity x length by area.

My new answer is 44, much more reasonable!!

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