Smart questions
Smart answers
Smart people
Join Eng-Tips Forums

Member Login

Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • 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!

Join Eng-Tips
*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.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

BUFF BOOK IEEE Std 242-2001 vs 1986 (Transformer Impedance Table)

majesus (Electrical) (OP)
31 Aug 07 14:40
I can't seem to find the Impedance Data for three Phase Transformers in the IEEE 242-2001 Buff book.

It use to be on page 52 of the IEEE 242-1986 edition.

Did they remove it?
rbulsara (Electrical)
1 Sep 07 10:03
Not having recently referred to the 2001 edition, I am not sure of this particular table, but I do know that the latest version is not as insightful and helpful to new engineers. I was not impressed. It has removed many hand calculation procedures too. Anyone who has 1986 version, hang on to it. It will become another highly sought after edition.

As for tranformer impedance data, go to Square D website, look up power transformers and will get many tables. I am sure other leading mfr websites will have too.
wareagle (Electrical)
1 Sep 07 11:12
I have the book. Did you need the impedance for a particular size?
majesus (Electrical) (OP)
4 Sep 07 11:38
Thanks a lot guys for the info and help.

I do have both books, I am just interest and really curious on why did the IEEE remove a lot of the hand calculations and typical transformer impedances tables from the buff book? It seems that the 1986 is a lot more useful then the 2001 edition.  That doesn't make sense to me, wouldn't a new edition just refine and improve the older edition? In this case, it looks worse.
dpc (Electrical)
4 Sep 07 11:54
It may have been because they expected the Violet Book on Short Circuit Calculations to be published some day.  But this still hasn't happened yet.

This data is in Conrad St Pierre's book on Short Circuit Calculations.

stevenal (Electrical)
4 Sep 07 11:56
I believe the impedance tables are badly outdated, and warranted removal. Energy Star rated and other low loss transformers don't follow the table, and the newer versions of the referenced transformer standards no longer dictate impedances for most distribution transformers. Using these values for sizing equipment would not be wise.

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!

Back To Forum

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close